Uibezierpath and Cashapelayer with wanton drawing

First, CashapelayerCashapelayer is a subclass of Calayer, but more flexible than calayer, you can draw a variety of shapes using Cashapelayer to draw a rectangle let layer = CAShapeLayer() layer.frame = CGRectMake(110, 100, 150, 100) layer.backgroundColor = UIColor.blackColor().CGColor view.layer.addSublayer(layer)   CAShapeLayer 画图时的动画改变Strokeend, Strokestart, and LineWidth are three properties that control the animation effect when the dash is crossed.  Two Uibezierpath Cashapelayer has a magical attribute that path uses this property in conjunction with the Uibezierpath class to achieve the super-divine effect.
  2.1. Two important color properties of Cashapelayer fillcolor: fill Color of Layer layer.fillColor = UIColor.clearColor(). CGColor strokecolor:layer Border Color layer.strokeColor = UIColor.blackColor().CGColor   2.2、CAShapeLayer 和 Uibezierpath Mating Line let path = UIBezierPath(arcCenter: view.center, radius: radius, startAngle: startAngle, endAngle: endAngle, clockwise:  true ) let layer = CAShapeLayer() layer.path = path.CGPath layer.fillColor = UIColor.clearColor().CGColor layer.strokeColor = UIColor.blackColor().CGColor

Uibezierpath and Cashapelayer with wanton drawing