UIView dolnej granicy?


145

Do a UIScrollView *toScrollView(która jest szerokością ekranu) chcę dodać szare dolne obramowanie (dokładnie takie, jak w polu to widoku tworzenia wiadomości w natywnej aplikacji Wiadomości na telefonie iPhone).

Aby to osiągnąć, podążyłem za Cocoa Touch: Jak zmienić kolor i grubość obramowania UIView? i właśnie zakryłem górną granicę niestandardową UINavigationBari utworzyłem toScrollViewwspółrzędną x -1 i szerokość 322 tak, aby lewa i prawa krawędź były tuż poza ekranem.

Wygląda dobrze, ale to swego rodzaju hack i zastanawiałem się, czy istnieje lepszy sposób na zrobienie tego.

- (void)viewDidLoad {
    [super viewDidLoad];

    // Add UINavigationBar *navigationBar at top.
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
                                             initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                                             target:self action:@selector(cancelAction)];
    UINavigationBar *navigationBar = [[UINavigationBar alloc]
                                      initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 44.0f)];
    navigationBar.items = [NSArray arrayWithObject:self.navigationItem];

    // Add UIScrollView *toScrollView below navigationBar.
    UIScrollView *toScrollView = [[UIScrollView alloc]
                                  initWithFrame:CGRectMake(-1.0f, 43.0f, 322.0f, 45.0f)];
    toScrollView.backgroundColor = [UIColor whiteColor];
    toScrollView.layer.borderColor = [UIColor colorWithWhite:0.8f alpha:1.0f].CGColor;
    toScrollView.layer.borderWidth = 1.0f;
    [self.view addSubview:toScrollView];
    [self.view addSubview:navigationBar]; // covers top of toScrollView
}

Oto przydatna kategoria UIView, która umożliwia tworzenie ramek opartych na warstwach lub widokach z dowolnej strony UIView: UIView + Borders
aroooo,

Odpowiedzi:


257

Zamiast używać a UIView, jak sugeruje @ ImreKelényi, możesz użyć CALayer:

// Add a bottomBorder.
CALayer *bottomBorder = [CALayer layer];

bottomBorder.frame = CGRectMake(0.0f, 43.0f, toScrollView.frame.size.width, 1.0f);

bottomBorder.backgroundColor = [UIColor colorWithWhite:0.8f 
                                                 alpha:1.0f].CGColor;

[toScrollView.layer addSublayer:bottomBorder];

25
Nie zapomnij o #import <QuartzCore / QuartzCore.h>
Kyle Clegg

3
Konieczne może być również dodanie QuartzCore frameworkdo projektu, jeśli go nie masz, ponieważ mogą wystąpić błędy kompilatora.
Flea

2
@Flea teraz, z włączonymi modułami, nie powinieneś QuartzCore.frameworkjuż dodawać .
ma11hew 28

3
Możesz przełączyć 43.0fsię toScrollView.frame.size.heightna, aby upewnić się, że jest na dole
mparryy

19
WIELKIM problemem związanym z korzystaniem z CALayer jest to, że został on naprawiony. Gdy rozmiar widoku zmieni się (obrót urządzenia, automatyczny układ itp.), Wówczas CALayer nie dostosuje się automatycznie. Będziesz musiał sam to ustawić. Natomiast użycie drawRect może obsłużyć zmianę automatycznie.
Womble,

78

Oto bardziej uogólnione rozszerzenie Swift do tworzenia obramowania dla dowolnej UIViewpodklasy:

import UIKit

extension UIView {      
  func addTopBorderWithColor(color: UIColor, width: CGFloat) {
    let border = CALayer()
    border.backgroundColor = color.CGColor
    border.frame = CGRectMake(0, 0, self.frame.size.width, width)
    self.layer.addSublayer(border)
  }

  func addRightBorderWithColor(color: UIColor, width: CGFloat) {
    let border = CALayer()
    border.backgroundColor = color.CGColor
    border.frame = CGRectMake(self.frame.size.width - width, 0, width, self.frame.size.height)
    self.layer.addSublayer(border)
  }

  func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
    let border = CALayer()
    border.backgroundColor = color.CGColor
    border.frame = CGRectMake(0, self.frame.size.height - width, self.frame.size.width, width)
    self.layer.addSublayer(border)
  }

  func addLeftBorderWithColor(color: UIColor, width: CGFloat) {
    let border = CALayer()
    border.backgroundColor = color.CGColor
    border.frame = CGRectMake(0, 0, width, self.frame.size.height)
    self.layer.addSublayer(border)
  }
}

Szybki 3

extension UIView {
    func addTopBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x: 0, y: 0, width: self.frame.size.width, height: width)
        self.layer.addSublayer(border)
    }

    func addRightBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x: self.frame.size.width - width, y: 0, width: width, height: self.frame.size.height)
        self.layer.addSublayer(border)
    }

    func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x: 0, y: self.frame.size.height - width, width: self.frame.size.width, height: width)
        self.layer.addSublayer(border)
    }

    func addLeftBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x: 0, y: 0, width: width, height: self.frame.size.height)
        self.layer.addSublayer(border)
    }
}

2
Możesz chcieć usunąć poprzednio dodaną podwarstwę (na wypadek, gdyby została wywołana w pętli), używając tego w każdej funkcji - if let subLayerArray = self.layer.sublayers {for layer in subLayerArray {layer.removeFromSuperlayer ()}}
Nitin Nain

1
Jaka jest wspomniana szerokość.?
G.Abhisek

do użytku Swift 3.0 border.frame = CGRect(x: 0, y: 0, width: self.frame.size.width, height: width)itp.
lenooh

@NitinNain Ostrożnie, to usuwa więcej warstw, niż zamierzasz. Na przykład bardzo prawdopodobne jest, że wystąpi awaria podczas wyświetlania klawiatury, jeśli usuniesz wszystkie warstwy UIView.layer ...
xaphod

60

Zaimplementowane w kategorii jak poniżej:

UIButton + Border.h:

@interface UIButton (Border)

- (void)addBottomBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

- (void)addLeftBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

- (void)addRightBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

- (void)addTopBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

@end

UIButton + Border. M:

@implementation UIButton (Border)

- (void)addTopBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    CALayer *border = [CALayer layer];
    border.backgroundColor = color.CGColor;

    border.frame = CGRectMake(0, 0, self.frame.size.width, borderWidth);
    [self.layer addSublayer:border];
}

- (void)addBottomBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    CALayer *border = [CALayer layer];
    border.backgroundColor = color.CGColor;

    border.frame = CGRectMake(0, self.frame.size.height - borderWidth, self.frame.size.width, borderWidth);
    [self.layer addSublayer:border];
}

- (void)addLeftBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    CALayer *border = [CALayer layer];
    border.backgroundColor = color.CGColor;

    border.frame = CGRectMake(0, 0, borderWidth, self.frame.size.height);
    [self.layer addSublayer:border];
}

- (void)addRightBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    CALayer *border = [CALayer layer];
    border.backgroundColor = color.CGColor;

    border.frame = CGRectMake(self.frame.size.width - borderWidth, 0, borderWidth, self.frame.size.height);
    [self.layer addSublayer:border];
}

@end

7
dobra robota ... ale czy jest coś w tym kodzie, co jest specyficzne dla UIButton? może równie dobrze dodać go do UIView nie?
opactwo

5
Niezły fragment. Przebudowałem to i przeszedłem na Swift. Znajdziesz go tutaj .
Isuru,

Co się stanie, jeśli główna warstwa przycisku ma promień obramowania?
konfile

Zgadzam się, że @abbood może równie dobrze uczynić tę kategorię na UIView. Warto jednak.
Robert J. Clegg

Tak, działa dobrze na UIView. Powiązane pytanie: jak sprawić, by to działało z automatycznym układem? Oczywiście, jeśli ramka się zmieni, musisz ponownie narysować granicę, tak jak jest.
elsurudo

26

Szybki 4

Jeśli potrzebujesz naprawdę adaptacyjnego rozwiązania (dla wszystkich rozmiarów ekranu), to jest to:

/**
* Extends UIView with shortcut methods
*
* @author Alexander Volkov
* @version 1.0
*/
extension UIView {

    /// Adds bottom border to the view with given side margins
    ///
    /// - Parameters:
    ///   - color: the border color
    ///   - margins: the left and right margin
    ///   - borderLineSize: the size of the border
    func addBottomBorder(color: UIColor = UIColor.red, margins: CGFloat = 0, borderLineSize: CGFloat = 1) {
        let border = UIView()
        border.backgroundColor = color
        border.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(border)
        border.addConstraint(NSLayoutConstraint(item: border,
                                                attribute: .height,
                                                relatedBy: .equal,
                                                toItem: nil,
                                                attribute: .height,
                                                multiplier: 1, constant: borderLineSize))
        self.addConstraint(NSLayoutConstraint(item: border,
                                              attribute: .bottom,
                                              relatedBy: .equal,
                                              toItem: self,
                                              attribute: .bottom,
                                              multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: border,
                                              attribute: .leading,
                                              relatedBy: .equal,
                                              toItem: self,
                                              attribute: .leading,
                                              multiplier: 1, constant: margins))
        self.addConstraint(NSLayoutConstraint(item: border,
                                              attribute: .trailing,
                                              relatedBy: .equal,
                                              toItem: self,
                                              attribute: .trailing,
                                              multiplier: 1, constant: margins))
    }
}

@DanielBeltrami Zgadzam się, ale nie potrafię zmusić recenzentów do sprawdzania nowych odpowiedzi po ich zaakceptowaniu.
Alexander Volkov

19

Możesz dodać oddzielny element UIViewo wysokości 1 punktu i szarym kolorem tła self.viewi umieścić go poniżej toScrollView.

EDYCJA: Jeśli nie masz dobrego powodu (chcesz skorzystać z niektórych usług UIView, które nie są oferowane przez CALayer), powinieneś użyć CALayer, jak sugeruje @MattDiPasquale . UIView ma większe obciążenie, co w większości przypadków może nie stanowić problemu, ale mimo to drugie rozwiązanie jest bardziej eleganckie.


13

Rozwiązanie dla Swift 4

let bottomBorder = CALayer()
        bottomBorder.frame = CGRect(x: 0.0, y: calendarView.frame.size.height-1, width: calendarView.frame.width, height: 1.0)
        bottomBorder.backgroundColor = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
        calendarView.layer.addSublayer(bottomBorder)

BackgroundColor jasnoszary. Zmień kolor, jeśli potrzebujesz.


11

Jest też ulepszony kod z funkcją usuwania obramowania. Na podstawie konfrontowanej odpowiedzi .

import UIKit

enum viewBorder: String {
    case Left = "borderLeft"
    case Right = "borderRight"
    case Top = "borderTop"
    case Bottom = "borderBottom"
}

extension UIView {

    func addBorder(vBorder: viewBorder, color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.name = vBorder.rawValue
        switch vBorder {
            case .Left:
                border.frame = CGRectMake(0, 0, width, self.frame.size.height)
            case .Right:
                border.frame = CGRectMake(self.frame.size.width - width, 0, width, self.frame.size.height)
            case .Top:
                border.frame = CGRectMake(0, 0, self.frame.size.width, width)
            case .Bottom:
                border.frame = CGRectMake(0, self.frame.size.height - width, self.frame.size.width, width)
        }
        self.layer.addSublayer(border)
    }

    func removeBorder(border: viewBorder) {
        var layerForRemove: CALayer?
        for layer in self.layer.sublayers! {
            if layer.name == border.rawValue {
                layerForRemove = layer
            }
        }
        if let layer = layerForRemove {
            layer.removeFromSuperlayer()
        }
    }

}

Aktualizacja: Swift 3

import UIKit

enum ViewBorder: String {
    case left, right, top, bottom
}

extension UIView {

    func add(border: ViewBorder, color: UIColor, width: CGFloat) {
        let borderLayer = CALayer()
        borderLayer.backgroundColor = color.cgColor
        borderLayer.name = border.rawValue
        switch border {
        case .left:
            borderLayer.frame = CGRect(x: 0, y: 0, width: width, height: self.frame.size.height)
        case .right:
            borderLayer.frame = CGRect(x: self.frame.size.width - width, y: 0, width: width, height: self.frame.size.height)
        case .top:
            borderLayer.frame = CGRect(x: 0, y: 0, width: self.frame.size.width, height: width)
        case .bottom:
            borderLayer.frame = CGRect(x: 0, y: self.frame.size.height - width, width: self.frame.size.width, height: width)
        }
        self.layer.addSublayer(borderLayer)
    }

    func remove(border: ViewBorder) {
        guard let sublayers = self.layer.sublayers else { return }
        var layerForRemove: CALayer?
        for layer in sublayers {
            if layer.name == border.rawValue {
                layerForRemove = layer
            }
        }
        if let layer = layerForRemove {
            layer.removeFromSuperlayer()
        }
    }

}

Niezłe rozszerzenie. Trochę wyczyściłem usunięcie. func remove(border: ViewBorder) { layer.sublayers? .compactMap { $0 } .filter { $0.name == border.rawValue } .forEach { $0.removeFromSuperlayer() } }
Matthew Korporaal

7

Problem z tymi metodami rozszerzeń polega na tym, że gdy UIView / UIButton później dostosuje swój rozmiar, nie ma możliwości zmiany rozmiaru CALayer, aby pasował do nowego rozmiaru. Który pozostawi cię z niewłaściwą granicą. Okazało się, że lepiej jest podklasować mój UIButton, możesz oczywiście podklasować również inne UIViews. Oto kod:

enum BorderedButtonSide {
    case Top, Right, Bottom, Left
}


class BorderedButton : UIButton {

    private var borderTop: CALayer?
    private var borderTopWidth: CGFloat?
    private var borderRight: CALayer?
    private var borderRightWidth: CGFloat?
    private var borderBottom: CALayer?
    private var borderBottomWidth: CGFloat?
    private var borderLeft: CALayer?
    private var borderLeftWidth: CGFloat?


    func setBorder(side: BorderedButtonSide, _ color: UIColor, _ width: CGFloat) {

        let border = CALayer()
        border.backgroundColor = color.CGColor

        switch side {
        case .Top:
            border.frame = CGRect(x: 0, y: 0, width: frame.size.width, height: width)
            borderTop?.removeFromSuperlayer()
            borderTop = border
            borderTopWidth = width
        case .Right:
            border.frame = CGRect(x: frame.size.width - width, y: 0, width: width, height: frame.size.height)
            borderRight?.removeFromSuperlayer()
            borderRight = border
            borderRightWidth = width
        case .Bottom:
            border.frame = CGRect(x: 0, y: frame.size.height - width, width: frame.size.width, height: width)
            borderBottom?.removeFromSuperlayer()
            borderBottom = border
            borderBottomWidth = width
        case .Left:
            border.frame = CGRect(x: 0, y: 0, width: width, height: frame.size.height)
            borderLeft?.removeFromSuperlayer()
            borderLeft = border
            borderLeftWidth = width
        }

        layer.addSublayer(border)
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        borderTop?.frame = CGRect(x: 0, y: 0, width: frame.size.width, height: borderTopWidth!)
        borderRight?.frame = CGRect(x: frame.size.width - borderRightWidth!, y: 0, width: borderRightWidth!, height: frame.size.height)
        borderBottom?.frame = CGRect(x: 0, y: frame.size.height - borderBottomWidth!, width: frame.size.width, height: borderBottomWidth!)
        borderLeft?.frame = CGRect(x: 0, y: 0, width: borderLeftWidth!, height: frame.size.height)
    }

}

Niezłe rozwiązanie! Dziękuję za udostępnienie.
Thomás Calmon

7

Lub najbardziej przyjaznym dla wydajności sposobem jest przeciążenie drawRect, po prostu w ten sposób:

@interface TPActionSheetButton : UIButton

@property (assign) BOOL drawsTopLine;
@property (assign) BOOL drawsBottomLine;
@property (assign) BOOL drawsRightLine;
@property (assign) BOOL drawsLeftLine;
@property (strong, nonatomic) UIColor * lineColor;

@end

@implementation TPActionSheetButton

- (void) drawRect:(CGRect)rect
{
    CGContextRef ctx = UIGraphicsGetCurrentContext();

    CGContextSetLineWidth(ctx, 0.5f * [[UIScreen mainScreen] scale]);
    CGFloat red, green, blue, alpha;
    [self.lineColor getRed:&red green:&green blue:&blue alpha:&alpha];
    CGContextSetRGBStrokeColor(ctx, red, green, blue, alpha);

    if(self.drawsTopLine) {
        CGContextBeginPath(ctx);
        CGContextMoveToPoint(ctx, CGRectGetMinX(rect), CGRectGetMinY(rect));
        CGContextAddLineToPoint(ctx, CGRectGetMaxX(rect), CGRectGetMinY(rect));
        CGContextStrokePath(ctx);
    }
    if(self.drawsBottomLine) {
        CGContextBeginPath(ctx);
        CGContextMoveToPoint(ctx, CGRectGetMinX(rect), CGRectGetMaxY(rect));
        CGContextAddLineToPoint(ctx, CGRectGetMaxX(rect), CGRectGetMaxY(rect));
        CGContextStrokePath(ctx);
    }
    if(self.drawsLeftLine) {
        CGContextBeginPath(ctx);
        CGContextMoveToPoint(ctx, CGRectGetMinX(rect), CGRectGetMinY(rect));
        CGContextAddLineToPoint(ctx, CGRectGetMinX(rect), CGRectGetMaxY(rect));
        CGContextStrokePath(ctx);
    }
    if(self.drawsRightLine) {
        CGContextBeginPath(ctx);
        CGContextMoveToPoint(ctx, CGRectGetMaxX(rect), CGRectGetMinY(rect));
        CGContextAddLineToPoint(ctx, CGRectGetMaxX(rect), CGRectGetMaxY(rect));
        CGContextStrokePath(ctx);
    }

    [super drawRect:rect];
}

@end

6
Zastępowanie drawRect:niekoniecznie jest przyjazne dla wydajności. Jestem prawie pewien, że użycie warstwy ma znacznie lepszą wydajność.
ThomasW,

1
@ThomasW Ale co się dzieje, gdy granice zmieniają się w odpowiedzi na obrót urządzenia? Albo podzielona opinia? A może coś, co robi Auto Layout?
Womble

@Womble Musisz zaktualizować warstwę, zastępując metodę setFrame:, setBounds:lub layoutSubviews.
ThomasW,

Polecam layoutSublayersOfLayer:zamiast setFrame:lub którykolwiek z pozostałych
Koen.

5

Wersja Swift 3 odpowiedzi Confile:

import UIKit

extension UIView {
    func addTopBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x: 0, y: 0, width: self.frame.size.width, height: width)
        self.layer.addSublayer(border)
    }

    func addRightBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x: self.frame.size.width - width, y: 0, width: width, height: self.frame.size.height)
        self.layer.addSublayer(border)
    }

    func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x: 0, y: self.frame.size.height - width, width: self.frame.size.width, height: width)
        self.layer.addSublayer(border)
    }

    func addLeftBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x: 0, y: 0, width: width, height: self.frame.size.height)
        self.layer.addSublayer(border)
    }
}

Zastosowanie podczas korzystania z układu automatycznego:

class CustomView: UIView {

    override func awakeFromNib() {
        super.awakeFromNib()
    }

    override func layoutSubviews() {
        addBottomBorderWithColor(color: UIColor.white, width: 1)
    }
}

Na urządzeniach iPad i iPhone plus linia nie wypełnia całego ekranu. Czy jest na to rozwiązanie @ spogebob92
Grumme

Domyślam się, że układ automatyczny został zakończony, więc zanim dodasz obramowanie, może wywołaj layoutIfNeeded ()
spogebob92

5

Jeśli używasz ograniczeń (a więc nie masz rozmiarów ramek), możesz dodać widok obramowania z wymaganymi ograniczeniami

// MARK: - Add a border to one side of a view

public enum BorderSide {
    case top, bottom, left, right
}

extension UIView {
    public func addBorder(side: BorderSide, color: UIColor, width: CGFloat) {
        let border = UIView()
        border.translatesAutoresizingMaskIntoConstraints = false
        border.backgroundColor = color
        self.addSubview(border)

        let topConstraint = topAnchor.constraint(equalTo: border.topAnchor)
        let rightConstraint = trailingAnchor.constraint(equalTo: border.trailingAnchor)
        let bottomConstraint = bottomAnchor.constraint(equalTo: border.bottomAnchor)
        let leftConstraint = leadingAnchor.constraint(equalTo: border.leadingAnchor)
        let heightConstraint = border.heightAnchor.constraint(equalToConstant: width)
        let widthConstraint = border.widthAnchor.constraint(equalToConstant: width)


        switch side {
        case .top:
            NSLayoutConstraint.activate([leftConstraint, topConstraint, rightConstraint, heightConstraint])
        case .right:
            NSLayoutConstraint.activate([topConstraint, rightConstraint, bottomConstraint, widthConstraint])
        case .bottom:
            NSLayoutConstraint.activate([rightConstraint, bottomConstraint, leftConstraint, heightConstraint])
        case .left:
            NSLayoutConstraint.activate([bottomConstraint, leftConstraint, topConstraint, widthConstraint])
        }
    }
}

Następnie ustaw coś takiego jak poniżej

myButton.addBorder(side: .left, color: UIColor.lightGray, width: 1)

(zainspirowany tą odpowiedzią )


kocham rozszerzenie. Wielkie dzięki!
Phillip Jacobs

5

Szybki

Utwórz rozszerzenie UIView

private var bottomLineColorAssociatedKey : UIColor = .black
private var topLineColorAssociatedKey : UIColor = .black
private var rightLineColorAssociatedKey : UIColor = .black
private var leftLineColorAssociatedKey : UIColor = .black
extension UIView {

@IBInspectable var bottomLineColor: UIColor {
    get {
        if let color = objc_getAssociatedObject(self, &bottomLineColorAssociatedKey) as? UIColor {
            return color
        } else {
            return .black
        }
    } set {
        objc_setAssociatedObject(self, &bottomLineColorAssociatedKey, newValue, .OBJC_ASSOCIATION_RETAIN)
    }
}
@IBInspectable var bottomLineWidth: CGFloat {
    get {
        return self.bottomLineWidth
    }
    set {
        DispatchQueue.main.async {
            self.addBottomBorderWithColor(color: self.bottomLineColor, width: newValue)
        }
    }
}
@IBInspectable var topLineColor: UIColor {
    get {
        if let color = objc_getAssociatedObject(self, &topLineColorAssociatedKey) as? UIColor {
            return color
        } else {
            return .black
        }
    } set {
        objc_setAssociatedObject(self, &topLineColorAssociatedKey, newValue, .OBJC_ASSOCIATION_RETAIN)
    }
}
@IBInspectable var topLineWidth: CGFloat {
    get {
        return self.topLineWidth
    }
    set {
        DispatchQueue.main.async {
            self.addTopBorderWithColor(color: self.topLineColor, width: newValue)
        }
    }
}
@IBInspectable var rightLineColor: UIColor {
    get {
        if let color = objc_getAssociatedObject(self, &rightLineColorAssociatedKey) as? UIColor {
            return color
        } else {
            return .black
        }
    } set {
        objc_setAssociatedObject(self, &rightLineColorAssociatedKey, newValue, .OBJC_ASSOCIATION_RETAIN)
    }
}
@IBInspectable var rightLineWidth: CGFloat {
    get {
        return self.rightLineWidth
    }
    set {
        DispatchQueue.main.async {
            self.addRightBorderWithColor(color: self.rightLineColor, width: newValue)
        }
    }
}
@IBInspectable var leftLineColor: UIColor {
    get {
        if let color = objc_getAssociatedObject(self, &leftLineColorAssociatedKey) as? UIColor {
            return color
        } else {
            return .black
        }
    } set {
        objc_setAssociatedObject(self, &leftLineColorAssociatedKey, newValue, .OBJC_ASSOCIATION_RETAIN)
    }
}
@IBInspectable var leftLineWidth: CGFloat {
    get {
        return self.leftLineWidth
    }
    set {
        DispatchQueue.main.async {
            self.addLeftBorderWithColor(color: self.leftLineColor, width: newValue)
        }
    }
}
func addTopBorderWithColor(color: UIColor, width: CGFloat) {
    let border = CALayer()
    border.name = "topBorderLayer"
    removePreviouslyAddedLayer(name: border.name ?? "")
    border.backgroundColor = color.cgColor
    border.frame = CGRect(x: 0, y : 0,width: self.frame.size.width, height: width)
    self.layer.addSublayer(border)
    self.addObserver(self, forKeyPath: #keyPath(UIView.bounds), options: .new, context: UnsafeMutableRawPointer(bitPattern: 1111) )
}

func addRightBorderWithColor(color: UIColor, width: CGFloat) {
    let border = CALayer()
    border.name = "rightBorderLayer"
    removePreviouslyAddedLayer(name: border.name ?? "")
    border.backgroundColor = color.cgColor
    border.frame = CGRect(x: self.frame.size.width - width, y: 0, width : width, height :self.frame.size.height)
    self.layer.addSublayer(border)
     self.addObserver(self, forKeyPath: #keyPath(UIView.bounds), options: .new, context: UnsafeMutableRawPointer(bitPattern: 2222) )
}

func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
    let border = CALayer()
    border.name = "bottomBorderLayer"
    removePreviouslyAddedLayer(name: border.name ?? "")
    border.backgroundColor = color.cgColor
    border.frame = CGRect(x: 0, y: self.frame.size.height - width,width : self.frame.size.width,height: width)
    self.layer.addSublayer(border)
    self.addObserver(self, forKeyPath: #keyPath(UIView.bounds), options: .new, context: UnsafeMutableRawPointer(bitPattern: 3333) )
}
func addLeftBorderWithColor(color: UIColor, width: CGFloat) {
    let border = CALayer()
    border.name = "leftBorderLayer"
    removePreviouslyAddedLayer(name: border.name ?? "")
    border.backgroundColor = color.cgColor
    border.frame = CGRect(x:0, y:0,width : width, height : self.frame.size.height)
    self.layer.addSublayer(border)
    self.addObserver(self, forKeyPath: #keyPath(UIView.bounds), options: .new, context: UnsafeMutableRawPointer(bitPattern: 4444) )
}
override open func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {

    if let objectView = object as? UIView,
        objectView === self,
        keyPath == #keyPath(UIView.bounds) {
        switch context {
        case UnsafeMutableRawPointer(bitPattern: 1111):
            for border in self.layer.sublayers ?? [] {
                if border.name == "topBorderLayer" {
                    border.frame = CGRect(x: 0, y : 0,width: self.frame.size.width, height: border.frame.height)
                }
            }
        case UnsafeMutableRawPointer(bitPattern: 2222):
            for border in self.layer.sublayers ?? [] {
                if border.name == "rightBorderLayer" {
                     border.frame = CGRect(x: self.frame.size.width - border.frame.width, y: 0, width : border.frame.width, height :self.frame.size.height)
                }
            }
        case UnsafeMutableRawPointer(bitPattern: 3333):
            for border in self.layer.sublayers ?? [] {
                if border.name == "bottomBorderLayer" {
                    border.frame = CGRect(x: 0, y: self.frame.size.height - border.frame.height,width : self.frame.size.width,height: border.frame.height)
                }
            }
        case UnsafeMutableRawPointer(bitPattern: 4444):
            for border in self.layer.sublayers ?? [] {
                if border.name == "leftBorderLayer" {
                   border.frame = CGRect(x:0, y:0,width : border.frame.width, height : self.frame.size.height)
                }
            }
        default:
            break
        }
    }
}
func removePreviouslyAddedLayer(name : String) {
    if self.layer.sublayers?.count ?? 0 > 0 {
        self.layer.sublayers?.forEach {
            if $0.name == name {
                $0.removeFromSuperlayer()
            }
        }
    }
   }
}

Cel C

Utwórz klasę kategorii UIView

UIView + Border.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
@interface UIView (Border) 

@property (nonatomic) IBInspectable UIColor *topLineColor;
@property (nonatomic) IBInspectable CGFloat topLineWidth;
@property (nonatomic) IBInspectable UIColor *bottomLineColor;
@property (nonatomic) IBInspectable CGFloat bottomLineWidth;
@property (nonatomic) IBInspectable UIColor *rightLineColor;
@property (nonatomic) IBInspectable CGFloat rightLineWidth;
@property (nonatomic) IBInspectable UIColor *leftLineColor;
@property (nonatomic) IBInspectable CGFloat leftLineWidth;

- (void)addBottomBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

- (void)addLeftBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

- (void)addRightBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

- (void)addTopBorderWithColor: (UIColor *) color andWidth:(CGFloat) borderWidth;

@end

UIView + Border. M

static void *topBorderContext = &topBorderContext;
static void *bottomBorderContext = &bottomBorderContext;
static void *leftBorderContext = &leftBorderContext;
static void *rightBorderContext = &rightBorderContext;
static char bottomLineColorKey,topLineColorKey,rightLineColorKey,leftLineColorKey;
@implementation UIView(Utility)
@dynamic borderColor,borderWidth,cornerRadius,bottomLineWidth,topLineWidth,rightLineWidth,leftLineWidth;

-(void)setBorderColor:(UIColor *)borderColor{
    [self.layer setBorderColor:borderColor.CGColor];
}

-(void)setBorderWidth:(CGFloat)borderWidth{
    [self.layer setBorderWidth:borderWidth];
}

-(void)setCornerRadius:(CGFloat)cornerRadius{
    [self.layer setCornerRadius:cornerRadius];
}
// for Bottom Line
- (UIColor *)bottomLineColor {
    return objc_getAssociatedObject(self, &bottomLineColorKey);
}
- (void)setBottomLineColor:(UIColor *)bottomLineColor {
    objc_setAssociatedObject(self, &bottomLineColorKey,
                             bottomLineColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
-(void)setBottomLineWidth:(CGFloat)bottomLineWidth {
    [self addBottomBorderWithColor:[self bottomLineColor] andWidth:bottomLineWidth];
}
// for top Line
- (UIColor *)topLineColor {
    return objc_getAssociatedObject(self, &topLineColorKey);
}
- (void)setTopLineColor:(UIColor *)topLineColor {
    objc_setAssociatedObject(self, &topLineColorKey,
                             topLineColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (void)setTopLineWidth:(CGFloat)topLineWidth{
    [self addTopBorderWithColor:[self topLineColor] andWidth:topLineWidth];
}
// for right Line
- (UIColor *)rightLineColor {
    return objc_getAssociatedObject(self, &rightLineColorKey);
}
-(void)setRightLineColor:(UIColor *)rightLineColor {
    objc_setAssociatedObject(self, &rightLineColorKey,
                             rightLineColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
-(void)setRightLineWidth:(CGFloat)rightLineWidth{
    [self addRightBorderWithColor:[self rightLineColor] andWidth:rightLineWidth];
}
// for left Line
-(UIColor *)leftLineColor {
    return objc_getAssociatedObject(self, &leftLineColorKey);
}
-(void)setLeftLineColor:(UIColor *)leftLineColor{
    objc_setAssociatedObject(self, &leftLineColorKey,
                             leftLineColor, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
-(void)setLeftLineWidth:(CGFloat)leftLineWidth{
    [self addLeftBorderWithColor:[self leftLineColor] andWidth:leftLineWidth];
}

- (void)addTopBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    dispatch_async(dispatch_get_main_queue(), ^{
        CALayer *border = [CALayer layer];
        border.name = @"topBorderLayer";
        [self removePreviouslyAddedLayer:border.name];
        border.backgroundColor = color.CGColor;
        border.frame = CGRectMake(0, 0, self.frame.size.width, borderWidth);
        [self.layer addSublayer:border];
        [self addObserver:self forKeyPath: @"bounds" options:NSKeyValueObservingOptionNew context:topBorderContext];
    });
}

- (void)addBottomBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    dispatch_async(dispatch_get_main_queue(), ^{
        CALayer *border = [CALayer layer];
        border.name = @"bottomBorderLayer";
        [self removePreviouslyAddedLayer:border.name];
        border.backgroundColor = color.CGColor;
        border.frame = CGRectMake(0, self.frame.size.height - borderWidth, self.frame.size.width, borderWidth);
        [self.layer addSublayer:border];
        [self addObserver:self forKeyPath: @"bounds" options:NSKeyValueObservingOptionNew context:bottomBorderContext];
    });
}

- (void)addLeftBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    dispatch_async(dispatch_get_main_queue(), ^{
        CALayer *border = [CALayer layer];
        border.name = @"leftBorderLayer";
        [self removePreviouslyAddedLayer:border.name];
        border.backgroundColor = color.CGColor;
        border.frame = CGRectMake(0, 0, borderWidth, self.frame.size.height);
        [self.layer addSublayer:border];
        [self addObserver:self forKeyPath: @"bounds" options:NSKeyValueObservingOptionNew context:leftBorderContext];
    });
}

- (void)addRightBorderWithColor:(UIColor *)color andWidth:(CGFloat) borderWidth {
    dispatch_async(dispatch_get_main_queue(), ^{
        CALayer *border = [CALayer layer];
        border.name = @"rightBorderLayer";
        [self removePreviouslyAddedLayer:border.name];
        border.backgroundColor = color.CGColor;
        border.frame = CGRectMake(self.frame.size.width - borderWidth, 0, borderWidth, self.frame.size.height);
        [self.layer addSublayer:border];
        [self addObserver:self forKeyPath: @"bounds" options:NSKeyValueObservingOptionNew context:rightBorderContext];
    });
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if (context == topBorderContext) {
        for (CALayer *border in self.layer.sublayers) {
            if ([border.name isEqualToString:@"topBorderLayer"]) {
                [border setFrame:CGRectMake(0, 0, self.frame.size.width, border.frame.size.height)];
            }
        }
    } else if (context == bottomBorderContext) {
        for (CALayer *border in self.layer.sublayers) {
            if ([border.name isEqualToString:@"bottomBorderLayer"]) {
                [border setFrame:CGRectMake(0, self.frame.size.height - border.frame.size.height, self.frame.size.width, border.frame.size.height)];
            }
        }
    } else if (context == leftBorderContext) {
        for (CALayer *border in self.layer.sublayers) {
            if ([border.name isEqualToString:@"leftBorderLayer"]) {
                [border setFrame:CGRectMake(0, 0, border.frame.size.width, self.frame.size.height)];
            }
        }
    } else if (context == rightBorderContext) {
        for (CALayer *border in self.layer.sublayers) {
            if ([border.name isEqualToString:@"rightBorderLayer"]) {
                [border setFrame:CGRectMake(self.frame.size.width - border.frame.size.width, 0, border.frame.size.width, self.frame.size.height)];
            }
        }
    } else {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}
- (void)removePreviouslyAddedLayer:(NSString *)name {
    if (self.layer.sublayers.count > 0) {
        for (CALayer *layer in self.layer.sublayers) {
            if ([layer.name isEqualToString:name]) {
                [layer removeFromSuperlayer];
            }
        }
    }
}

@end

Sposób użycia: - Wybierz dowolną kontrolkę z serii ujęć, a następnie pokaż inspektora atrybutów (prawa strona) Zobaczysz poniższy obraz Przykład. (Uwaga: obramowanie pojawia się tylko w czasie wykonywania).

Teraz możesz ustawić kolor i szerokość obramowania dowolnej strony.


To działa ... Dzięki ... Ale jeśli osadzony w UINavigationBar, oblicza współrzędne źle ..
delavega66

2

Napisałem ogólną metodę, która doda obramowanie po dowolnych stronach, które chcesz UIView. Możesz zdefiniować grubość, kolor, marginesy i zOrderdla każdej strony.

/*
 view: the view to draw border around
 thickness: thickness of the border on the given side
 color: color of the border on the given side
 margin: space between the border's outer edge and the view's frame edge on the given side.
 zOrder: defines the order to add the borders to the view.  The borders will be added by zOrder from lowest to highest, thus making the highest priority border visible when two borders overlap at the corners.
*/

    +(void) drawBorderAroundUIView:(UIView *) view thicknessLeft:(CGFloat) thicknessLeft colorLeft:(UIColor *)colorLeft marginLeft:(CGFloat) marginLeft zOrderLeft:(int) zOrderLeft thicknessRight:(CGFloat) thicknessRight colorRight:(UIColor *)colorRight marginRight:(CGFloat) marginRight zOrderRight:(int) zOrderRight thicknessTop:(CGFloat) thicknessTop colorTop:(UIColor *)colorTop marginTop:(CGFloat) marginTop zOrderTop:(int) zOrderTop thicknessBottom:(CGFloat) thicknessBottom colorBottom:(UIColor *)colorBottom marginBottom:(CGFloat) marginBottom zOrderBottom:(int) zOrderBottom{
    //make margins be the outside edge and make positive margin represent a smaller rectangle
    marginBottom = -1 * marginBottom - thicknessBottom;
    marginTop = -1 * marginTop - thicknessTop;
    marginLeft = -1 * marginLeft - thicknessLeft;
    marginRight = -1 * marginRight - thicknessRight;

    //get reference points for corners
    CGPoint upperLeftCorner = CGPointZero;
    CGPoint lowerLeftCorner = CGPointMake(upperLeftCorner.x, upperLeftCorner.y + view.frame.size.height);
    CGPoint upperRightCorner = CGPointMake(upperLeftCorner.x + view.frame.size.width, upperLeftCorner.y);

    //left
    CALayer *leftBorder = [CALayer layer];
    leftBorder.frame = CGRectMake(upperLeftCorner.x - thicknessLeft - marginLeft, upperLeftCorner.y - thicknessTop - marginTop, thicknessLeft, view.frame.size.height + marginTop + marginBottom + thicknessBottom + thicknessTop);
    leftBorder.backgroundColor = colorLeft.CGColor;

    //right
    CALayer *rightBorder = [CALayer layer];
    rightBorder.frame = CGRectMake(upperRightCorner.x + marginRight, upperRightCorner.y - thicknessTop - marginTop, thicknessRight, view.frame.size.height + marginTop + marginBottom + thicknessBottom + thicknessTop);
    rightBorder.backgroundColor = colorRight.CGColor;

    //top
    CALayer *topBorder = [CALayer layer];
    topBorder.frame = CGRectMake(upperLeftCorner.x - thicknessLeft - marginLeft, upperLeftCorner.y - thicknessTop - marginTop, view.frame.size.width + marginLeft + marginRight + thicknessLeft + thicknessRight, thicknessTop);
    topBorder.backgroundColor = colorTop.CGColor;

    //bottom
    CALayer *bottomBorder = [CALayer layer];
    bottomBorder.frame = CGRectMake(upperLeftCorner.x - thicknessLeft - marginLeft, lowerLeftCorner.y + marginBottom, view.frame.size.width + marginLeft + marginRight + thicknessLeft + thicknessRight, thicknessBottom);
    bottomBorder.backgroundColor = colorBottom.CGColor;

    //define dictionary keys to be used for adding borders in order of zOrder
    NSString *borderDK = @"border";
    NSString *zOrderDK = @"zOrder";

    //storing borders in dictionaries in preparation to add them in order of zOrder
    NSDictionary *leftBorderDictionary = [NSDictionary dictionaryWithObjectsAndKeys:leftBorder, borderDK, [NSNumber numberWithInt:zOrderLeft], zOrderDK, nil];
    NSDictionary *rightBorderDictionary = [NSDictionary dictionaryWithObjectsAndKeys:rightBorder, borderDK, [NSNumber numberWithInt:zOrderRight], zOrderDK, nil];
    NSDictionary *topBorderDictionary = [NSDictionary dictionaryWithObjectsAndKeys:topBorder, borderDK, [NSNumber numberWithInt:zOrderTop], zOrderDK, nil];
    NSDictionary *bottomBorderDictionary = [NSDictionary dictionaryWithObjectsAndKeys:bottomBorder, borderDK, [NSNumber numberWithInt:zOrderBottom], zOrderDK, nil];

    NSMutableArray *borders = [NSMutableArray arrayWithObjects:leftBorderDictionary, rightBorderDictionary, topBorderDictionary, bottomBorderDictionary, nil];

    //add borders in order of zOrder (lowest -> highest).  Thus the highest zOrder will be added last so it will be on top.
    while (borders.count)
    {
        //look for the next lowest zOrder border to add
        NSDictionary *nextBorderToLayDown = [borders objectAtIndex:0];
        for (int indexOfBorder = 0; indexOfBorder < borders.count; indexOfBorder++)
        {
            NSDictionary *borderAtIndex = [borders objectAtIndex:indexOfBorder];
            if ([[borderAtIndex objectForKey:zOrderDK] intValue] < [[nextBorderToLayDown objectForKey:zOrderDK] intValue])
            {
                nextBorderToLayDown = borderAtIndex;
            }
        }
        //add the border to the view
        [view.layer addSublayer:[nextBorderToLayDown objectForKey:borderDK]];
        [borders removeObject:nextBorderToLayDown];
    }
}

2

Nie musisz dodawać warstwy dla każdej ramki, po prostu użyj ścieżki beziera, aby je narysować raz.

CGRect rect = self.bounds;

CGPoint destPoint[4] = {CGPointZero,
    (CGPoint){0, rect.size.height},
    (CGPoint){rect.size.width, rect.size.height},
    (CGPoint){rect.size.width, 0}};

BOOL position[4] = {_top, _left, _bottom, _right};

UIBezierPath *path = [UIBezierPath new];
[path moveToPoint:destPoint[3]];

for (int i = 0; i < 4; ++i) {
    if (position[i]) {
        [path addLineToPoint:destPoint[i]];
    } else {
        [path moveToPoint:destPoint[i]];
    }
}

CAShapeLayer *borderLayer = [CAShapeLayer new];
borderLayer.frame = self.bounds;
borderLayer.path  = path.CGPath;
borderLayer.lineWidth   = _borderWidth ?: 1 / [UIScreen mainScreen].scale;
borderLayer.strokeColor = _borderColor.CGColor;
borderLayer.fillColor   = [UIColor clearColor].CGColor;

[self.layer addSublayer:borderLayer];

2

Swift 4/3

Możesz skorzystać z tego rozwiązania poniżej. Działa na ścieżkach UIBezierPath, które są lżejsze niż warstwy, powodując szybki czas uruchamiania. Jest łatwy w użyciu, zobacz instrukcje poniżej.

class ResizeBorderView: UIView {
    var color = UIColor.white
    var lineWidth: CGFloat = 1
    var edges = [UIRectEdge](){
        didSet {
            setNeedsDisplay()
        }
    }
    override func draw(_ rect: CGRect) {
        if edges.contains(.top) || edges.contains(.all){
            let path = UIBezierPath()
            path.lineWidth = lineWidth
            color.setStroke()
            UIColor.blue.setFill()
            path.move(to: CGPoint(x: 0, y: 0 + lineWidth / 2))
            path.addLine(to: CGPoint(x: self.bounds.width, y: 0 + lineWidth / 2))
            path.stroke()
        }
        if edges.contains(.bottom) || edges.contains(.all){
            let path = UIBezierPath()
            path.lineWidth = lineWidth
            color.setStroke()
            UIColor.blue.setFill()
            path.move(to: CGPoint(x: 0, y: self.bounds.height - lineWidth / 2))
            path.addLine(to: CGPoint(x: self.bounds.width, y: self.bounds.height - lineWidth / 2))
            path.stroke()
        }
        if edges.contains(.left) || edges.contains(.all){
            let path = UIBezierPath()
            path.lineWidth = lineWidth
            color.setStroke()
            UIColor.blue.setFill()
            path.move(to: CGPoint(x: 0 + lineWidth / 2, y: 0))
            path.addLine(to: CGPoint(x: 0 + lineWidth / 2, y: self.bounds.height))
            path.stroke()
        }
        if edges.contains(.right) || edges.contains(.all){
            let path = UIBezierPath()
            path.lineWidth = lineWidth
            color.setStroke()
            UIColor.blue.setFill()
            path.move(to: CGPoint(x: self.bounds.width - lineWidth / 2, y: 0))
            path.addLine(to: CGPoint(x: self.bounds.width - lineWidth / 2, y: self.bounds.height))
            path.stroke()
        }
    }
}
  1. Ustaw klasę UIView na ResizeBorderView
  2. Ustaw kolor i szerokość linii, używając yourview.color i yourview.lineWidth w metodzie viewDidAppear
  3. Ustaw krawędzie, na przykład: yourview.edges = [.right, .left] ([.all]) dla wszystkich
  4. Ciesz się szybkim startem i zmianą rozmiaru obramowań

2

Szybki 4

Na podstawie: https://stackoverflow.com/a/32821607/9980800

UIView + obramowanie

extension UIView {

  enum ViewBorder: String {
      case left, right, top, bottom
  }

  func add(Border border: ViewBorder, withColor color: UIColor = UIColor.lightGray, andWidth width: CGFloat = 1.0) {

    let borderView = UIView()
    borderView.backgroundColor = color
    borderView.translatesAutoresizingMaskIntoConstraints = false
    self.addSubview(borderView)
    NSLayoutConstraint.activate(getConstrainsFor(forView: borderView, WithBorderType: border, andWidth: width))
  }

  private func getConstrainsFor(forView borderView: UIView, WithBorderType border: ViewBorder, andWidth width: CGFloat) -> [NSLayoutConstraint] {

    let height = borderView.heightAnchor.constraint(equalToConstant: width)
    let widthAnchor = borderView.widthAnchor.constraint(equalToConstant: width)
    let leading = borderView.leadingAnchor.constraint(equalTo: self.leadingAnchor)
    let trailing = borderView.trailingAnchor.constraint(equalTo: self.trailingAnchor)
    let top = borderView.topAnchor.constraint(equalTo: self.topAnchor)
    let bottom = borderView.bottomAnchor.constraint(equalTo: self.bottomAnchor)

    switch border {

    case .bottom:
        return [bottom, leading, trailing, height]

    case .top:
        return [top, leading, trailing, height]

    case .left:
        return [top, bottom, leading, widthAnchor]

    case .right:
        return [top, bottom, trailing, widthAnchor]
    }
}

}

Stosowanie:-

class ViewController: UIViewController {

@IBOutlet weak var sampleView: UIView!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    sampleView.add(Border: .bottom)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
}

2

Szybki 4

Na podstawie https://stackoverflow.com/a/32513578/5391914

import UIKit
enum ViewBorder: String {
    case Left = "borderLeft"
    case Right = "borderRight"
    case Top = "borderTop"
    case Bottom = "borderBottom"
}

extension UIView {
    
    func addBorder(vBorders: [ViewBorder], color: UIColor, width: CGFloat) {
        vBorders.forEach { vBorder in
            let border = CALayer()
            border.backgroundColor = color.cgColor
            border.name = vBorder.rawValue
            switch vBorder {
            case .Left:
                border.frame = CGRect(x: 0, y: 0, width: width, height: self.frame.size.height)
            case .Right:
                border.frame = CGRect(x:self.frame.size.width - width, y: 0, width: width, height: self.frame.size.height)
            case .Top:
                border.frame = CGRect(x: 0, y: 0, width: self.frame.size.width, height: width)
            case .Bottom:
                border.frame = CGRect(x: 0, y: self.frame.size.height - width , width: self.frame.size.width, height: width)
            }
            self.layer.addSublayer(border)
        }
    }
}

1

Najbardziej kompletna odpowiedź. https://github.com/oney/UIView-Border

let rectangle = UIView(frame: CGRect(x: 100, y: 100, width: 100, height: 60))
rectangle.backgroundColor = UIColor.grayColor()
view.addSubview(rectangle)
rectangle.borderTop = Border(size: 3, color: UIColor.orangeColor(), offset: UIEdgeInsets(top: 0, left: -10, bottom: 0, right: -5))
rectangle.borderBottom = Border(size: 6, color: UIColor.redColor(), offset: UIEdgeInsets(top: 0, left: 10, bottom: 10, right: 0))
rectangle.borderLeft = Border(size: 2, color: UIColor.blueColor(), offset: UIEdgeInsets(top: 10, left: -10, bottom: 0, right: 0))
rectangle.borderRight = Border(size: 2, color: UIColor.greenColor(), offset: UIEdgeInsets(top: 10, left: 10, bottom: 0, right: 0))

wprowadź opis obrazu tutaj


1

Szybkie rozszerzenie 4 z szerokością i kolorem obramowania. Działa świetnie!

@IBDesignable
final class SideBorders: UIView {
@IBInspectable var topColor: UIColor = UIColor.clear
@IBInspectable var topWidth: CGFloat = 0

@IBInspectable var rightColor: UIColor = UIColor.clear
@IBInspectable var rightWidth: CGFloat = 0

@IBInspectable var bottomColor: UIColor = UIColor.clear
@IBInspectable var bottomWidth: CGFloat = 0

@IBInspectable var leftColor: UIColor = UIColor.clear
@IBInspectable var leftWidth: CGFloat = 0

override func draw(_ rect: CGRect) {
    let topBorder = CALayer()
    topBorder.backgroundColor = topColor.cgColor
    topBorder.frame = CGRect(x: 0, y: 0, width: self.frame.size.width, height: topWidth)
    self.layer.addSublayer(topBorder)

    let rightBorder = CALayer()
    rightBorder.backgroundColor = rightColor.cgColor
    rightBorder.frame = CGRect(x: self.frame.size.width - rightWidth, y: 0, width: rightWidth, height: self.frame.size.height)
    self.layer.addSublayer(rightBorder)

    let bottomBorder = CALayer()
    bottomBorder.backgroundColor = bottomColor.cgColor
    bottomBorder.frame = CGRect(x: 0, y: self.frame.size.height - bottomWidth, width: self.frame.size.width, height: bottomWidth)
    self.layer.addSublayer(bottomBorder)

    let leftBorder = CALayer()
    leftBorder.backgroundColor = leftColor.cgColor
    leftBorder.frame = CGRect(x: 0, y: self.frame.size.height - leftWidth, width: self.frame.size.width, height: leftWidth)
    self.layer.addSublayer(leftBorder)
}

}


1

Swift 5.1. Używaj z dwoma rozszerzeniami, metoda return CALayer, aby ponownie użyć jej do aktualizacji ramek.

enum Border: Int {
    case top = 0
    case bottom
    case right
    case left
}

extension UIView {
    func addBorder(for side: Border, withColor color: UIColor, borderWidth: CGFloat) -> CALayer {
       let borderLayer = CALayer()
       borderLayer.backgroundColor = color.cgColor

       let xOrigin: CGFloat = (side == .right ? frame.width - borderWidth : 0)
       let yOrigin: CGFloat = (side == .bottom ? frame.height - borderWidth : 0)

       let width: CGFloat = (side == .right || side == .left) ? borderWidth : frame.width
       let height: CGFloat = (side == .top || side == .bottom) ? borderWidth : frame.height

       borderLayer.frame = CGRect(x: xOrigin, y: yOrigin, width: width, height: height)
       layer.addSublayer(borderLayer)
       return borderLayer
    }
}

extension CALayer {
    func updateBorderLayer(for side: Border, withViewFrame viewFrame: CGRect) {
        let xOrigin: CGFloat = (side == .right ? viewFrame.width - frame.width : 0)
        let yOrigin: CGFloat = (side == .bottom ? viewFrame.height - frame.height : 0)

        let width: CGFloat = (side == .right || side == .left) ? frame.width : viewFrame.width
        let height: CGFloat = (side == .top || side == .bottom) ? frame.height : viewFrame.height

        frame = CGRect(x: xOrigin, y: yOrigin, width: width, height: height)
    }
}

Jak korzystać z UpdateBorderLayer w addBorder?
Chandan Jee

musisz przechowywać CALayer, który jest zwracany z metody addBorder. Następnie, gdy musisz zaktualizować (na przykład w viewDidLayoutSubviews), wywołaj tę metodę. W przeciwnym razie użyj ograniczeń
Ivan Tkachenko

1

rozszerzenie UIView {

func addBottomLine (color: UIColor, height: CGFloat) {

   let bottomView = UIView(frame: CGRect(x: 0, y: self.frame.height - 1, width: self.frame.width, height: height))
    bottomView.translatesAutoresizingMaskIntoConstraints = false
    bottomView.autoresizingMask = .flexibleWidth
    bottomView.backgroundColor = color
    self.addSubview(bottomView)

}

}


Chociaż ten kod może odpowiedzieć na pytanie, lepiej byłoby uwzględnić kontekst, wyjaśniając, jak to działa i kiedy go używać. Odpowiedzi zawierające tylko kod nie są przydatne na dłuższą metę.
Mustafa

Cieszę się, że słyszę od Ciebie, odpowiem na Twoje pytanie -> 1- najpierw utwórz plik o nazwie co chcesz, a następnie utwórz rozszerzenie z UIView, a następnie dodaj metodę, która najpierw zajmie się CGFloat, a następnie UIColor dodaj powyższy kod w tej metodzie i zmień 1 w pierwszym wierszu z wysokością: parametry CGFloat i ustaw bottomView.backgroundColor = {THE_COLOR_PARAMS}
Ahmed Samir
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