如何创建像MKMapView用户位置Swift 3/4的波形视图

使用以下自定义UIView类来执行此操作

Use the following custom UIView class to do this

//  ringView.swift

import UIKit

/**

 ## ringView class ##

 This class is responsible for show a red waves progress to user when waitting to accept a request

 */

class ringView:UIView
{
    /// timer to start draw

    var timer:Timer!

    /// last tag of drawn circle

    var lastTag:Int = 0

    override func draw(_ rect: CGRect)
    {
       print("Calling Rect.....")
       // drawRingFittingInsideView()
    }
    internal func drawRingFittingInsideView()->()
    {
        let halfSize:CGFloat = min( bounds.size.width/2, bounds.size.height/2)
        let desiredLineWidth:CGFloat = 1    // your desired value

        let circlePath = UIBezierPath(
            arcCenter: CGPoint(x:halfSize,y:halfSize),
            radius: CGFloat( halfSize - (desiredLineWidth/2) ),
            startAngle: CGFloat(0),
            endAngle:CGFloat(Double.pi * 4),
            clockwise: true)


      // print("self.tag \(self.tag) width \(self.frame.size.width)")

        let shapeLayer = CAShapeLayer()

        shapeLayer.path = circlePath.cgPath


        shapeLayer.fillColor = UIColor.init(red: 255/255.0, green: 0/255.0, blue: 0/255.0, alpha:   255  / 255.0).cgColor
         shapeLayer.strokeColor = UIColor.init(red: 255/255.0, green:0/255.0, blue: 0/255.0, alpha: 1).cgColor
         shapeLayer.lineWidth = desiredLineWidth

        layer.addSublayer(shapeLayer)
    }

    /**

     ## start draw timer ##

     */

    func start()
    {
       self.timer = Timer.scheduledTimer(timeInterval: 1.2  ,
                                                 target: self,
                                                 selector: #selector(self.doIt),
                                                 userInfo: nil,
                                                 repeats: true)

    }

    /**

     ## actual draw process with red color ##

     */

    @objc func doIt()
    {

        let v = UIView.init(frame: CGRect.init(x: 0, y: 0, width: 5, height:5))

        let halfSize:CGFloat = min( 5/2, 5/2)
        let desiredLineWidth:CGFloat = 1    // your desired value

        let circlePath = UIBezierPath(
            arcCenter: CGPoint(x:halfSize,y:halfSize),
            radius: CGFloat( halfSize - (desiredLineWidth/2) ),
            startAngle: CGFloat(0),
            endAngle:CGFloat(Double.pi * 4),
            clockwise: true)

        let shapeLayer = CAShapeLayer()

        shapeLayer.path = circlePath.cgPath

        shapeLayer.fillColor = UIColor.init(red: 255/255.0, green: 0/255.0, blue: 0/255.0, alpha:   255  / 255.0).cgColor
        shapeLayer.strokeColor = UIColor.init(red: 255/255.0, green:0/255.0, blue: 0/255.0, alpha: 1).cgColor
        shapeLayer.lineWidth = desiredLineWidth

        v.layer.addSublayer(shapeLayer)


        let newCon1 = NSLayoutConstraint.init(item:v, attribute: NSLayoutAttribute.centerX, relatedBy: NSLayoutRelation.equal, toItem: self.superview, attribute: NSLayoutAttribute.centerX, multiplier: 1.0, constant: 0.0)


        let newCon2 = NSLayoutConstraint.init(item:v, attribute: NSLayoutAttribute.centerY, relatedBy: NSLayoutRelation.equal, toItem: self.superview, attribute: NSLayoutAttribute.centerY, multiplier: 1.0, constant: 0.0)


        let newCon3 = NSLayoutConstraint.init(item:v, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1.0, constant: 5.0)



        let newCon4 = NSLayoutConstraint.init(item:v, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1.0, constant: 5.0)


        v.translatesAutoresizingMaskIntoConstraints = false

        v.tag = lastTag

        lastTag = lastTag+1

        self.superview?.addSubview(v)

        self.superview?.addConstraints([newCon1,newCon2,newCon3,newCon4])


        v.backgroundColor = UIColor.white.withAlphaComponent(0.0)

        v.isOpaque=false


        UIView.animate(withDuration: 10 , delay: 0, options: UIViewAnimationOptions.curveEaseInOut, animations:
            { () -> Void in

                v.transform = CGAffineTransform(scaleX: 60, y: 60)

                v.alpha = 0




        }, completion: { (finished: Bool) -> Void in

            v.removeFromSuperview() 
          //  print("Removed lastTag \(v.tag)")

        });

    }
    /**

     ## stop timer and remove red views from it's superView ##

     */

    func stop()
    {
        if(self.timer != nil)
        {
            self.timer.invalidate()

            self.timer = nil
        }

        for vs in self.subviews
        {
            vs.layer.removeAllAnimations()

            vs.removeFromSuperview()
        }

         self.removeFromSuperview()

    }

}

用法

    var rView:ringView!

    override func viewDidLoad() {

     super.viewDidLoad()

     rView = ringView.init(frame: CGRect.init(x: 0, y: 0, width: 100, height: 100))

     rView.backgroundColor = UIColor.white.withAlphaComponent(0.0)

     rView.isOpaque=false

     self.view.addSubview(rView)

    rView.center = self.view.center

    }

    override func viewDidAppear(_ animated: Bool) {

        rView.start()


    }

    override func viewDidDisappear(_ animated: Bool) {

        rView.stop()

    }

在这里查找完整的演示 RingDemo

Find a complete demo here RingDemo