仿悦跑圈轨迹回放

运动轨迹回放高德官方有demo，但需要运动物实时居中

代码在这里

先上最后效果图

创建CADisplayLink当作计时器，不要用NSTimer(不精确)

frameInterval 帧间隔，相当于每隔多久刷新一次 (设置为1，代表1/60秒刷新一次，实例中设的是2帧)

  dpLink = CADisplayLink(target: self, selector: #selector(ViewController.update))
  dpLink?.frameInterval = minframeInterval
  dpLink?.isPaused = false
  dpLink?.add(to: RunLoop.current, forMode: RunLoopMode.commonModes)

在update方法中持续改变地图中心，地图旋转角度，地图相机角度

  self.mapView.setCenter(traceCoordinates[uptateIndex+1], animated: false)
  self.mapView.setRotationDegree(CGFloat(yvAngle) , animated: false, duration: 1)
  self.mapView.setCameraDegree( CGFloat(yvAngle), animated: false, duration: 1)

uptateIndex 每次加1，temporarytraceCoordinates临时存当前位置之前的所有值，polyline每次替换为后一条

 if  let line = self.polyline  {
     self.mapView.remove(line)
 }
 temporarytraceCoordinates.append(traceCoordinates[uptateIndex])
 polyline = MAPolyline(coordinates: &temporarytraceCoordinates, count: UInt(temporarytraceCoordinates.count))

代理方法里改变线条颜色

func mapView(_ mapView: MAMapView!, rendererFor overlay: MAOverlay!) -> MAOverlayRenderer! {
        if overlay.isKind(of: MAPolyline.self) {
            let renderer: MAPolylineRenderer = MAPolylineRenderer.init(polyline: overlay as! MAPolyline!)
            renderer.lineWidth = 8.0
            renderer.strokeColor = UIColor(red: 0, green: 230, blue: 239, alpha: 1)
            return renderer
        }
        return nil
 }

poiAnnotationView?.image 设置运动物体的图片

    func mapView(_ mapView: MAMapView, viewFor annotation: MAAnnotation) -> MAAnnotationView? {
        
        if annotation.isEqual(myLocation) {
            let annotationIdentifier = "myLcoationIdentifier"
            var poiAnnotationView = mapView.dequeueReusableAnnotationView(withIdentifier: annotationIdentifier)
            if poiAnnotationView == nil {
                poiAnnotationView = MAAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)
            }
            poiAnnotationView?.image = UIImage(named: "userHeadimage")
            poiAnnotationView?.imageView.layer.cornerRadius = 20
            poiAnnotationView?.imageView.layer.masksToBounds = true
            poiAnnotationView?.imageView.backgroundColor = UIColor.white
            poiAnnotationView?.imageView.layer.borderColor = UIColor.white.cgColor
            poiAnnotationView?.imageView.layer.borderWidth = 2
            poiAnnotationView!.canShowCallout = false
            return poiAnnotationView
        }
        return nil
    }

发现bug或好的建议欢迎 issues or Email Yvente@163.com