Motion track playback: the official demo of Gaud is needed, but the moving object needs to be centered in real time

Code in Here

First and last renderings

2018-01-18 16_55_29.gif

Create CADisplayLink as timer, do not use nstimer

frameInterval frame interval, which is equivalent to how often to refresh (set to 1, which means 1 / 60 second refresh, in the example, set to 2 frames)

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

Continuously change the map center, map rotation angle and map camera angle in the update method

  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)

Each time uptateIndex is increased by 1, temporarytraceCoordinates temporarily stores all the values before the current location, and polyline is replaced by the next one each time

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

Change line color in proxy method

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

    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
    }

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