如何设置cornerRadius只用于UIView的左下角，右下角和左上角？

Question

有没有办法只为UIView的左下角，右下角和左上角设置cornerRadius？

我尝试了以下操作，但最终使视图消失。下面的代码有什么问题吗？

    UIBezierPath *maskPath;
    maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight) cornerRadii:CGSizeMake(20.0, 20.0)];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.path = maskPath.CGPath;
    view.layer.mask = maskLayer;

Answer 1

你可以这样做：

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.viewOutlet.bounds byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerBottomLeft | UIRectCornerBottomRight) cornerRadii:CGSizeMake(10.0, 10.0)];

CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = self.view.bounds;
maskLayer.path  = maskPath.CGPath;
self.viewOutlet.layer.mask = maskLayer;

<强>更新
如果您需要边框，只需创建另一个CAShapeLayer并将其添加到查看的图层作为子图层。像这样（将此代码放在上面的代码下面）：

CAShapeLayer *borderLayer = [[CAShapeLayer alloc] init];
borderLayer.frame = self.view.bounds;
borderLayer.path  = maskPath.CGPath;
borderLayer.lineWidth   = 4.0f;
borderLayer.strokeColor = [UIColor blackColor].CGColor;
borderLayer.fillColor   = [UIColor clearColor].CGColor;

[self.viewOutlet.layer addSublayer:borderLayer];

在swift 3.0中这样：

let maskPath = UIBezierPath.init(roundedRect: self.viewOutlet.bounds, byRoundingCorners:[.topLeft, .bottomLeft], cornerRadii: CGSize.init(width: 10.0, height: 10.0))
let maskLayer = CAShapeLayer()
maskLayer.frame = self.viewOutlet.bounds
maskLayer.path = maskPath.cgPath
self.viewOutlet.layer.mask = maskLayer

Answer 2

在xcode 8和swift 3中测试

extension UIView {
    func roundCorners(corners:UIRectCorner, radius: CGFloat) {
      let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
      let mask = CAShapeLayer()
      mask.path = path.cgPath
      self.layer.mask = mask
    }
}

并像这样使用

YourView.roundCorners([.topLeft, .bottomLeft], radius: 10)

Answer 3

使用自定义UIView并实施以下代码

#import "CustomUIView.h"

@implementation CustomView

- (void)drawRect:(CGRect)rect
{
    // Drawing code
    CAShapeLayer * maskLayer = [CAShapeLayer layer];
    maskLayer.path = [UIBezierPath bezierPathWithRoundedRect: self.bounds byRoundingCorners: UIRectCornerTopLeft | UIRectCornerBottomLeft | UIRectCornerBottomRight cornerRadii: (CGSize){20.0, 20.0}].CGPath;

    self.layer.mask = maskLayer;
}

@end

<强>输出：

查看UIBezierPath.h选项：

typedef NS_OPTIONS(NSUInteger, UIRectCorner) {
    UIRectCornerTopLeft     = 1 << 0,
    UIRectCornerTopRight    = 1 << 1,
    UIRectCornerBottomLeft  = 1 << 2,
    UIRectCornerBottomRight = 1 << 3,
    UIRectCornerAllCorners  = ~0UL
};

Answer 4

在Swift

中设置视图的角半径

图层的创建和屏蔽应在从drawRect()继承的可选UIView块内运行

    override func drawRect(rect: CGRect) {
        super.drawRect(rect)

        let maskPath = UIBezierPath(roundedRect: self.view.bounds, byRoundingCorners: [.TopLeft, .BottomLeft, .BottomRight], cornerRadii: CGSizeMake(10, 10))
        let maskLayer = CAShapeLayer()
        maskLayer.frame = self.view.bounds
        maskLayer.path  = maskPath.CGPath
        self.view.layer.mask = maskLayer
    }

Answer 5

我知道现在已经很晚了，但我只创建了一种只传递一个或多个UIRectCorners的方法。

  [self setMaskTo:myView byRoundingCorners:(UIRectCornerTopLeft|UIRectCornerTopRight)];

- (void)setMaskTo:(UIView*)view byRoundingCorners:(UIRectCorner)corners
        {
            UIBezierPath *rounded = [UIBezierPath bezierPathWithRoundedRect:view.bounds
                                                          byRoundingCorners:corners
                                                                cornerRadii:CGSizeMake(8.0, 8.0)];
            CAShapeLayer *shape = [[CAShapeLayer alloc] init];
            [shape setPath:rounded.CGPath];
            view.layer.mask = shape;
    }

Answer 6

希望这会对你有所帮助

您的上述代码在我的机器上完美运行，可能是您将CAShapeLayer框架设置为等于您的视图框架，因为您的视图将消失，但我在代码中看不到此行，因此请检查您的视图财产并在代码下面申请

  UIBezierPath *maskPath;
    maskPath = [UIBezierPath bezierPathWithRoundedRect:viewName.bounds
                                     byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight |UIRectCornerTopLeft)
                                           cornerRadii:CGSizeMake(20.0, 20.0)];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame =viewName.bounds; 
    maskLayer.path = maskPath.CGPath;
   viewName.layer.mask = maskLayer;

Answer 7

UIBezierPath *maskPath;
maskPath = [UIBezierPath bezierPathWithRoundedRect:someView.bounds 
                             byRoundingCorners:(UIRectCornerTopLeft|UIRectCornerTopRight|UIRectCornerBottomLeft|UIRectCornerBottomRight) 
                                   cornerRadii:CGSizeMake(10.0,10.0,5.0, 10.0)];


CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = self.bounds;
maskLayer.path = maskPath.CGPath;
someView.layer.mask = maskLayer;

Answer 8

试用此代码

-(void)setMaskTo:(UIView*)view byRoundingCorners:(UIRectCorner)corners {
    UIBezierPath* rounded = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(10.0, 10.0)];
    CAShapeLayer* shape = [[CAShapeLayer alloc] init];
    [shape setPath:rounded.CGPath];
    view.layer.mask = shape;
}

使用

进行通话

[self setMaskTo:myView byRoundingCorners:UIRectCornerTopLeft|UIRectCornerTopRight];

可用选项：

UIRectCornerTopLeft, UIRectCornerTopRight,UIRectCornerBottomLeft,UIRectCornerBottomRight,UIRectCornerAllCorners

Answer 9

使用此代码的角落半径只有两面。很久以后我得到了建议ios。这里viewFilter是我们想要舍入的视图出口。

-(void) viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
[self setMaskTo:viewFilter byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight];
}

-(void)setMaskTo:(UIView*)view byRoundingCorners:(UIRectCorner)corners{

UIBezierPath *rounded = [UIBezierPathbezierPathWithRoundedRect:view.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(20.0, 20.0)];

CAShapeLayer *shape = [[CAShapeLayer alloc] init];
shape.frame = self.view.bounds;
[shape setPath:rounded.CGPath];
view.layer.mask = shape;
}

Answer 10

在iOS 11上，你只需要maskedCorners。

    let cornerRadius: CGFloat = 6.0
    if #available(iOS 11, *) {
        productImageView.layer.cornerRadius  = cornerRadius
        productImageView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]

    } else {
        let path        = UIBezierPath(roundedRect: bounds, byRoundingCorners: [.topLeft , .topRight], cornerRadii:CGSize(width: cornerRadius, height: cornerRadius))
        let maskLayer   = CAShapeLayer()
        maskLayer.frame = bounds
        maskLayer.path  = path.cgPath
        productImageView.mask                = maskLayer
        productImageView.layer.masksToBounds = true
    }