swift实现虚线圆圈带动画

overridefuncdraw(_rect:CGRect) {

//        let color1 = UIColor.white

//        color1.set() // 设置线条颜色

        letaPath1 =UIBezierPath(arcCenter:CGPoint(x:80, y:80), radius:74,

                                  startAngle:(CGFloat)((90*3)*Double.pi/180), endAngle: (CGFloat)(1.25*Double.pi), clockwise:true)

//        aPath1.setLineDash([3.0,70*CGFloat(Double.pi/80)-0.1 - 2], count:1, phase: 0)

//        aPath1.lineWidth = 8.0 // 线条宽度

//        aPath1.stroke() // Draws line 根据坐标点连线，不填充

        //添加动画

        letlineShape =CAShapeLayer()

        lineShape.frame=CGRect.init(x:0, y:0, width:74, height:74)

        lineShape.lineWidth=8

        lineShape.strokeColor=UIColor.white.cgColor

        lineShape.path= aPath1.cgPath

        lineShape.fillColor=UIColor.clear.cgColor

        lineShape.lineDashPhase=1

        letarr :NSArray=NSArray(array: [3.0,70*CGFloat(Double.pi/80)-0.1-2])

        lineShape.lineDashPattern= arras? [NSNumber]

        self.layer.addSublayer(lineShape)

        aPath1.close()

//        let color = UIColor(rgba: "#5999F9")

//        color.set() // 设置线条颜色

        letaPath =UIBezierPath(arcCenter:CGPoint(x:80, y:80), radius:74,

                                 startAngle:(CGFloat)(1.25*Double.pi)+(CGFloat)(2*Double.pi/180), endAngle: (CGFloat)((90*3)*Double.pi/180)-(CGFloat)(2*Double.pi/180), clockwise:true)

//        aPath.setLineDash([3.0,70*CGFloat(Double.pi/80)-0.1 - 2], count:1, phase: 0)

//        aPath.lineWidth = 8.0 // 线条宽度

//        aPath.stroke() // Draws line 根据坐标点连线，不填充

        //        aPath.fill() // Draws line 根据坐标点连线，填充

        //添加动画

        letlineShape1 =CAShapeLayer()

        lineShape1.frame=CGRect.init(x:0, y:0, width:74, height:74)

        lineShape1.lineWidth=8

        lineShape1.strokeColor=UIColor(red:51/250.0, green:51/250.0, blue:51/250.0, alpha:0.5).cgColor

        lineShape1.path= aPath.cgPath

        lineShape1.fillColor=UIColor.clear.cgColor

        lineShape1.lineDashPattern= arras? [NSNumber]

        self.layer.addSublayer(lineShape1)

        //添加动画

        letpathAnimation1 =CABasicAnimation.init(keyPath:"strokeEnd")

        pathAnimation1.duration=1

        pathAnimation1.timingFunction = CAMediaTimingFunction.init(name: CAMediaTimingFunctionName.easeOut)

        pathAnimation1.fromValue=0

        pathAnimation1.toValue=1

        lineShape1.add(pathAnimation1, forKey:"strokeEndAnimation")

        lineShape.add(pathAnimation1, forKey:"strokeEndAnimation")

        aPath.close()

    }