给控件添加边框

经常会遇到给控件添加边框的需求：边框大体有两种实线和虚线

1、虚线边框的添加：

func clipDashedLine() {
       let borderLayer = CAShapeLayer()
       borderLayer.bounds = self.bounds
       borderLayer.position = CGPoint(x: self.bounds.midX, y: self.bounds.midY)
       borderLayer.path = UIBezierPath.init(rect: borderLayer.bounds).cgPath
       borderLayer.lineWidth = 1
       borderLayer.lineDashPattern = [3,3]
       borderLayer.fillColor = UIColor.clear.cgColor
       borderLayer.strokeColor = UIColor.red.cgColor
       self.layer.addSublayer(borderLayer)
   }

2、实现边框的添加：

a、最常采用的方式：

view.layer.borderWidth = 1
        view.layer.borderColor = UIColor.red.cgColor

b、其它方式：

func clipFullLine() {
       let borderLayer = CAShapeLayer()
       borderLayer.bounds = self.bounds
       borderLayer.position = CGPoint(x: self.bounds.midX, y: self.bounds.midY)
       borderLayer.path = UIBezierPath.init(rect: borderLayer.bounds).cgPath
       borderLayer.lineWidth = 1
       borderLayer.lineDashPattern = nil
       borderLayer.fillColor = UIColor.clear.cgColor
       borderLayer.strokeColor = UIColor.red.cgColor
       self.layer.addSublayer(borderLayer)
   }

该方式和虚线可以结合使用