如何使用左上角&创建圆形的UIButton；仅左下角半径 [英] How to create rounded UIButton with top-left & bottom-left corner radius only

问题描述

我需要创建一个带有左上角&的按钮像这样的左下角半径.我尝试通过创建以下扩展名来尝试，该扩展名来自stackoverflow答案之一:

I need to create a button with top-left & bottom-left corner radius like this one . I tried by creating the following extension that was taken from one of stackoverflow answer:

extension UIButton {

   func roundCorners(corners:UIRectCorner, radius: CGFloat) {
       self.layer.borderColor = GenerateShape.UIColorFromHex(0x989898, alpha: (1.0-0.3)).CGColor
       self.layer.borderWidth = 1.0
       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

   }
}

然后调用这样的方法:

self.collectionBtn.roundCorners(.TopLeft | .BottomLeft, radius: cornerRadius) 

此代码生成以下形状

那么为什么左上角&左下角看不见?我应该怎么做才能使其可见?

So why the top-left & bottom-left corner invisible? What should I do to make them visible?

推荐答案

您的代码正在向您的按钮应用遮罩层.这会导致您在遮罩层中安装的形状以外的任何东西都被遮罩掉.当您安装带有圆角的路径时，它实际上是削掉"了两个角.那不是你想要的.

Your code is applying a mask layer to your button. that causes anything outside the shape you install in the mask layer to be masked away. When you install a path with rounded corners, it essentially "shaves off" the 2 corners. That's not what you want.

您可能想要创建一个形状层并将其安装为按钮层的常规子层，而不是遮罩层.您需要将填充颜色设置为清除.

You probably want to create a shape layer and install it as a regular sublayer of your button's layer, not as the mask layer. You'll need to set the fill color to clear however.

像这样更改代码:

extension UIButton 
{
  func roundCorners(corners:UIRectCorner, radius: CGFloat) 
  {
    let borderLayer = CAShapeLayer()
    borderLayer.frame = self.layer.bounds
    borderLayer.strokeColor = GenerateShape.UIColorFromHex(0x989898, 
      alpha: (1.0-0.3)).CGColor
    borderLayer.fillColor = UIColor.clearColor().CGColor
    borderLayer.lineWidth = 1.0
    let path = UIBezierPath(roundedRect: self.bounds, 
      byRoundingCorners: corners, 
      cornerRadii: CGSize(width: radius, height: radius))
    borderLayer.path = path.CGPath
    self.layer.addSublayer(borderLayer);
  }
}

您设置拐角的语法在Swift 2中不起作用

Your syntax for setting the corners won't work in Swift 2:

self.collectionBtn.roundCorners(.TopLeft | .BottomLeft, radius: 10)

应该是

self.collectionBtn.roundCorners([.TopLeft, .BottomLeft], radius: 10)

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