圆角矩形
override func draw(_ rect: CGRect) {
let context = UIGraphicsGetCurrentContext()
context?.move(to: CGPoint(x: 110, y: 100))
context?.addArc(tangent1End: CGPoint(x: 200, y: 100), tangent2End: CGPoint(x: 200, y:200), radius: 10)
context?.addArc(tangent1End: CGPoint(x: 200 , y: 200), tangent2End: CGPoint(x: 100, y:200), radius: 10)
context?.addArc(tangent1End: CGPoint(x: 100 , y: 200), tangent2End: CGPoint(x: 100, y:100), radius: 10)
context?.addArc(tangent1End: CGPoint(x: 100 , y: 100), tangent2End: CGPoint(x: 200, y:100), radius: 10)
context?.setStrokeColor(UIColor.orange.cgColor)
context?.setLineWidth(5)
context!.strokePath()
}
