swift - 画图 - 画矩形，虚线，圆和半圆

import UIKit

class JYJYBouncedCouponsViewCellBgView: UIView {

    //一定要在这里设置 背景色， 不要再draw里面设置，
    override init(frame: CGRect) {
        super.init(frame: frame)
        self.backgroundColor = UIColor.clear
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func draw(_ rect: CGRect) {
        // 获取上下文
        guard let context = UIGraphicsGetCurrentContext() else {
            return
        }

        //画一个矩形, 带圆角的，填充色为FFE4C3，切圆角5
        UIColor.init(hexColor: "FFE4C3").set()
        context.addPath(UIBezierPath(roundedRect: rect, cornerRadius: 5).cgPath)
        context.fillPath()
        //填充色setFillColor , 画线的颜色setStrokeColor
//        context.setFillColor(UIColor.init(hexColor: "FFE4C3").cgColor)

        // 画虚线
        /**设置起始和结束位置**/
        let startPointX: CGFloat = rect.size.width - 97
        let staerPointY: CGFloat = 0
        let endPointX: CGFloat = rect.size.width - 97
        let endPointY: CGFloat =  rect.size.height
        let path = CGMutablePath()
        path.move(to: CGPoint(x: startPointX, y: staerPointY))
        path.addLine(to: CGPoint(x: endPointX, y: endPointY))
        context.addPath(path)

        context.setStrokeColor(UIColor.init(hexColor: "FF8E00").cgColor)
        context.setLineWidth(1)
        /*
         phase参数表示在第一个虚线绘制的时候跳过多少个点
         lengths的值｛10,10｝表示先绘制10个点，再跳过10个点，如此反复
         如果把lengths值改为｛10, 20, 10｝，则表示先绘制10个点，跳过20个点，绘制10个点，跳过10个点，再绘制20个点，如此反复
         */
        context.setLineDash(phase: 0, lengths: [5,5])
        context.strokePath()

        // 画半圆
        UIColor.clear.set()
        /***设置圆心位置***/
        let circleY: CGFloat =  0
        let topCirclePoint: CGPoint = CGPoint(x: rect.size.width - 97, y: circleY)
        let bottomCenterPoint: CGPoint = CGPoint(x: rect.size.width - 97, y: rect.size.height)
        let topCircle = UIBezierPath(arcCenter: topCirclePoint, radius: 5, startAngle: -CGFloat.pi, endAngle: CGFloat.pi, clockwise: true)
        let bottpmCircle = UIBezierPath(arcCenter: bottomCenterPoint, radius: 5, startAngle: -CGFloat.pi, endAngle: CGFloat.pi, clockwise: true)
        context.setBlendMode(.clear)
        context.addPath(topCircle.cgPath)
        context.addPath(bottpmCircle.cgPath)
        context.fillPath()
    }

}