如何在不清除 GoogleMap 的情况下更新多个位置

Question

我已经通过集群在地图中加载了几个用户，现在我想根据我从服务器收到的用户新位置更新用户位置。

我可以通过清除地图并从服务器加载新用户数据来做到这一点，但看起来标记正在跳跃并且看起来不正确。

有没有办法在不清除GoogleMap的情况下更新标记位置？

这是我的问题的链接：Google Map with Cluster and Custom view marker lagging too much while zoomIn and zoomOut

参考屏幕

如果有人从他的位置移动，那么一旦我从服务器收到更新的数据，我该如何更新他/她的位置。 （不清除地图）

我的代码

func setMarkers() {
        for i in 0..<SharedData.sharedInstance.allFriends.count {
            let marker = GMSMarker()
            let friend = SharedData.sharedInstance.allFriends[i]
            marker.position = CLLocationCoordinate2D.init(latitude: friend.user_details.latitude , longitude: friend.user_details.longitude)
            marker.accessibilityHint = String(i)
            marker.icon = #imageLiteral(resourceName: "trans")
            marker.tracksViewChanges = true
            marker.map = mapView

            arrMarkers.append(marker)
            self.generatePOIItems(String(format: "%d", i), position: marker.position, icon: nil, friend: friend, userIndex: i)
        }
        clusterManager.cluster()
        clusterManager.setDelegate(self, mapDelegate: self)
    }

    func updateMarkers() {
        for i in 0..<arrMarkers.count {
            let marker = arrMarkers[i]
            let friend = SharedData.sharedInstance.allFriends[i]
            marker.position = CLLocationCoordinate2D.init(latitude: friend.user_details.latitude , longitude: friend.user_details.longitude)
            marker.accessibilityHint = String(i)
            marker.icon = #imageLiteral(resourceName: "trans")
            marker.tracksViewChanges = true
            marker.map = mapView
        }
        self.defaultCamera(latitude: SharedData.sharedInstance.userLocation.coordinate.latitude, longitude: SharedData.sharedInstance.userLocation.coordinate.longitude)
    }

编辑

func generatePOIItems(_ accessibilityLabel: String, position: CLLocationCoordinate2D, icon: UIImage?, friend: WallBeeppClass, userIndex: Int) {
        let name = "Item \(accessibilityLabel)"
        let item = POIItem(position: CLLocationCoordinate2DMake(position.latitude, position.longitude), name: name, friend: friend, userIndex: userIndex)
        clusterManager.add(item)
    }


func updateMarkers() {
        for i in 0..<arrMarkers.count {
            let marker = arrMarkers[i]
            let friend = SharedData.sharedInstance.allFriends[i]

            CATransaction.begin()
            CATransaction.setAnimationDuration(1.0)
            marker.position = CLLocationCoordinate2D.init(latitude: friend.user_details.latitude , longitude: friend.user_details.longitude)
            CATransaction.commit()
        }
    }

编辑 1

如果我从后端更改了一些用户位置，并且当我获得用户新位置时，我会使用上面的代码更新标记位置，但问题是新位置用户仍位于旧位置。如果我清除并重绘用户数据，那么它工作正常。

编辑 2

func renderer(_ renderer: GMUClusterRenderer, willRenderMarker marker: GMSMarker) {
        marker.groundAnchor = CGPoint(x: 0.1, y: 0.45)
        if let markerData = (marker.userData as? POIItem) {
            let infoWindow = Bundle.main.loadNibNamed("InitialMapInfoView", owner: self, options: nil)?.first as! InitialMapInfoView
            infoWindow.imgUser.sd_setImage(with: URL(string: markerData.friend.user_details.user_photo_small), placeholderImage: #imageLiteral(resourceName: "User_profile"), options: .highPriority, completed: nil)

            if !markerData.friend.user_details.isUserOnline {
                infoWindow.imgCar.image = UIImage.init(named: "small_inactive_" + markerData.friend.user_details.car_personality_name)
            }
            else {
                infoWindow.imgCar.image = UIImage.init(named: "small_" + markerData.friend.user_details.car_personality_name)
            }

            if markerData.friend.user_details.user_id == 88 {
                print("Will Rendrer Marker: \(markerData.friend.user_details.latitude)")
                print("Will Rendrer Marker: \(markerData.friend.user_details.longitude)")
            }

            infoWindow.lblName.text = markerData.friend.user_details.name
            infoWindow.btnImgVW.tag = markerData.userIndex
            infoWindow.btnImgVW.addTarget(self, action: #selector(btnUserTapped(_:)), for: .touchUpInside)
            marker.accessibilityHint = String(markerData.userIndex)
            marker.iconView = infoWindow
            marker.tracksViewChanges = false
        }

请指导我这样做。

Answer 1

您可以继承 GMSMarker，添加对象的 id，然后通过从服务器获得的对象 id 获取标记并更新位置。这是一些代码来解释我的意思

    class MyMarker: GMSMarker {

         var id: String? = nil

    }

将 id 添加到您的标记中

func setMarkers() {

        let marker = MyMarker()
        let friend = SharedData.sharedInstance.allFriends[I]
        marker.id = friend.id

比通过 id 更新

for friend in SharedData.sharedInstance.allFriends {
        guard
            let marker = array.first { $0.id == friend.id }
        else { contiunue }
        marker.position = CLLocationCoordinate2D.init(latitude: friend.user_details.latitude , longitude: friend.user_details.longitude)
    }

不要再在地图上添加标记，只需改变它的位置