贝塞尔曲线.png

一, 创建自定义视图

    func createLayerWithView(view : UIView){
        let viewWidth=CGRectGetWidth(view.frame);
        let viewHeight=CGRectGetHeight(view.frame);
        let point1 = CGPointMake(0,10);
        let point2 = CGPointMake(viewWidth-35,10);
        let point3 = CGPointMake(viewWidth-25, 0);
        let point4 = CGPointMake(viewWidth-15,10);
        let point5 = CGPointMake(viewWidth,10);
        let point6 = CGPointMake(viewWidth , viewHeight);
        let point7 = CGPointMake(0, viewHeight);
        
        let bezierPath = UIBezierPath()
        bezierPath.moveToPoint(point1)
        bezierPath.addLineToPoint(point2)
        bezierPath.addLineToPoint(point3)
        bezierPath.addLineToPoint(point4)
        bezierPath.addLineToPoint(point5)
        bezierPath.addLineToPoint(point6)
        bezierPath.addLineToPoint(point7)
        bezierPath.closePath()
        
        let layer = CAShapeLayer()
        layer.path = bezierPath.CGPath
        view.layer.mask = layer
    }

二, 给它位置大小

    var customView : UIView!
     self.customView = UIView.init(frame: CGRectMake(WIDTH-(WIDTH/4+30),200, WIDTH/4+20,150))
        customView.backgroundColor = UIColor.blackColor()
        customView.alpha = 0.8
        self.view.addSubview(customView)
        self.createLayerWithView(self.customView)

三, 也可以在此设置动画

  UIView.animateWithDuration(0.8, animations: {
                
            })