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森林海
SWIFT 4请注意这样一个事实，即如果您的UIView子类中附加了布局约束，则必须按如下方式刷新它：override func layoutSubviews() {
super.layoutSubviews()
roundCorners(corners: [.topLeft, .topRight], radius: 3.0)}如果你不这么做，它就不会出现。在圆角处，使用分机：extension UIView {
func roundCorners(corners: UIRectCorner, radius: CGFloat) {
let path = UIBezierPath(roundedRect: bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let mask = CAShapeLayer()
mask.path = path.cgPath
layer.mask = mask }}
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收到一只叮咚
我不知道为什么您的解决方案不起作用，但下面的代码对我有用。创建一个Bezier掩码并将其应用到您的视图中。在下面的代码中，我正在舍入_backgroundView半径为3像素。self是一种习俗UITableViewCell:UIBezierPath *maskPath = [UIBezierPath
bezierPathWithRoundedRect:self.backgroundImageView.bounds
byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight)
cornerRadii:CGSizeMake(20, 20)];CAShapeLayer *maskLayer = [CAShapeLayer layer];maskLayer.frame = self.bounds;maskLayer.path = maskPath.CGPath;self.backgroundImageView.layer.mask = maskLayer;有一些改进的SWIFT版本：let path = UIBezierPath(roundedRect:viewToRound.bounds, byRoundingCorners:[.TopRight, .BottomLeft], cornerRadii: CGSizeMake(20, 20))let maskLayer = CAShapeLayer()maskLayer.path = path.CGPathviewToRound.layer.mask = maskLayerSWIFT 3.0版本：let path = UIBezierPath(roundedRect:viewToRound.bounds,
byRoundingCorners:[.topRight, .bottomLeft],
cornerRadii: CGSize(width: 20, height: 20))let maskLayer = CAShapeLayer()maskLayer.path = path.cgPath
viewToRound.layer.mask = maskLayer
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四季花海
这里有一个斯威夫特@JohnnyRockex答案的版本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 }}view.roundCorners([.topLeft, .bottomRight], radius: 10)注如果你用自动布局，您需要将您的UIView打电话roundCorners在视野中layoutSubviews为了达到最佳效果。class View: UIView {
override func layoutSubviews() {
super.layoutSubviews()
self.roundCorners([.topLeft, .bottomLeft], radius: 10)
}}