1.画出不规则图形的 path ：

private func createPolygonPath() -> CGPath {
        let path = UIBezierPath()
        path.move(to: CGPoint(x: 100, y: 200))
        path.addLine(to: CGPoint(x: 100, y: 400))
        path.addLine(to: CGPoint(x: 300, y: 400))
        path.addLine(to: CGPoint(x: 100, y: 200))
        return path.cgPath
2.画出需要的layer:
private func createPolygonLayer() -> CALayer {
        let polygonLayer = CAShapeLayer()
        polygonLayer.fillColor = UIColor.purple.cgColor
        polygonLayer.lineWidth = 1.0
        polygonLayer.strokeColor = UIColor.red.cgColor
        polygonPath = createPolygonPath()
        polygonLayer.path = polygonPath!
        return polygonLayer
4.重写drawRect方法形成不规则图形
override func draw(_ rect: CGRect) {
        super.draw(rect)
        self.layer.mask = createPolygonLayer()
5.重写pointInside方法只允许区域内可响应
override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        return polygonPath.contains(point)
事件响应规则是调用hitTest方法找到合适的responder，此时view作为responer会调用pointInside检查自己是否合适。
  
分类：
 iOS
 
标签：
 
UI Kit
 
  
 

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