如何仅为左下角、右下角和左上角文本视图设置cornerRadius? [英] how to set cornerRadius for only bottom-left,bottom-right and top-left corner textview?

问题描述

如何只设置左下角、右下角和左上角textview的圆角半径?

How to set corner radius only only bottom-left,bottom-right and top-left corner textview?

let rectShape = CAShapeLayer()
    rectShape.backgroundColor = UIColor.redColor().CGColor
    rectShape.bounds = messages.frame
    rectShape.position = messages.center
    rectShape.path = UIBezierPath(roundedRect: messages.bounds, byRoundingCorners: .BottomLeft | .TopRight, cornerRadii: CGSize(width: 20, height: 20)).CGPath

    messages.layer.addSublayer(rectShape)

这段代码创建了两个矩形.我不知道为什么.

this code create two rect. I dont know why.

推荐答案

你只需要如下图遮罩图层:

You just need to mask the layer as shown below:

对于 Swift 3:

let rectShape = CAShapeLayer()
rectShape.bounds = self.myView.frame
rectShape.position = self.myView.center
rectShape.path = UIBezierPath(roundedRect: self.myView.bounds, byRoundingCorners: [.bottomLeft , .bottomRight , .topLeft], cornerRadii: CGSize(width: 20, height: 20)).cgPath

self.myView.layer.backgroundColor = UIColor.green.cgColor
//Here I'm masking the textView's layer with rectShape layer
self.myView.layer.mask = rectShape

低版本:

let rectShape = CAShapeLayer()
rectShape.bounds = self.myView.frame
rectShape.position = self.myView.center
rectShape.path = UIBezierPath(roundedRect: self.myView.bounds, byRoundingCorners: .BottomLeft | .BottomRight | .TopLeft, cornerRadii: CGSize(width: 20, height: 20)).CGPath

self.myView.layer.backgroundColor = UIColor.greenColor().CGColor
//Here I'm masking the textView's layer with rectShape layer
self.myView.layer.mask = rectShape

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