Swift的UIButton的圆顶angular落

我知道我可以使用四个angular：

myBtn.layer.cornerRadius = 8 myBtn.layer.masksToBounds = true 

既然我只想做两个，我做了一些研究，发现这个 ：

 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 } } 

这就是这样调用的：

 view.roundCorners([.TopLeft , .TopRight], radius: 10) 

然而，这不适用于UIButton。 当我将扩展名切换为UIButtontypes并将其传递给一个button时，输出如下所示：

问题是，如何适应这个工作在UIButton？

Answer 1

添加UIButton的扩展名：

 extension UIButton{ func roundedButton(){ let maskPAth1 = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: [.TopLeft , .TopRight], cornerRadii:CGSizeMake(8.0, 8.0)) let maskLayer1 = CAShapeLayer() maskLayer1.frame = self.bounds maskLayer1.path = maskPAth1.CGPath self.layer.mask = maskLayer1 } } 

调用viewDidAppear / viewDidLayoutSubvies：

 btnCorner.roundedButton() 

buttonangular输出：

Answer 2

对于迅速3 Kirit Modi的答案改为：

 extension UIButton { func roundedButton(){ let maskPAth1 = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: [.topLeft , .topRight], cornerRadii:CGSize(width:8.0, height:8.0)) let maskLayer1 = CAShapeLayer() maskLayer1.frame = self.bounds maskLayer1.path = maskPAth1.cgPath self.layer.mask = maskLayer1 } } 

在扩展的文件的开始不要忘记添加：

 import UIKit 

如果你想要一个UIView的扩展，可以select舍入顶部或底部的angular，你可以使用：

 extension UIView { func roundedCorners(top: Bool){ let corners:UIRectCorner = (top ? [.topLeft , .topRight] : [.bottomRight , .bottomLeft]) let maskPAth1 = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii:CGSize(width:8.0, height:8.0)) let maskLayer1 = CAShapeLayer() maskLayer1.frame = self.bounds maskLayer1.path = maskPAth1.cgPath self.layer.mask = maskLayer1 } } 

这被称为button为：

 myButton.roundedCorners(top: true) 

Answer 3

更新你的扩展是这样的：

 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() var rect = self.bounds maskLayer.frame = rect mask.path = path.CGPath self.layer.mask = mask } } 

形状图层（蒙版）需要知道框架

Answer 4

你忘了设置你的形状图层的框架：

 mask.frame = layer.bounds 

Answer 5

使用这个代码，

 let path = UIBezierPath(roundedRect:viewTo.bounds, byRoundingCorners:[.TopRight, .TopLeft], cornerRadii: CGSizeMake(20, 20)) let maskLayer = CAShapeLayer() maskLayer.path = path.CGPath viewTo.layer.mask = maskLayer 

希望它有帮助