Question

我正在使用密钥“status”从firebase检索数据。如果状态为true，我将显示标记。如果为false，则标记需要从地图中消失。我花了无数个小时做这个应该工作，但我不知道我错过了什么。提前感谢您的帮助。

func ihelprLocationCoordinateMappers() {

    dbFir.child("frontEnd/users").observeEventType(.Value, withBlock: { (snapshot) in
        let receivePostSnapshot = snapshot.childSnapshotForPath("receivePost")

        for child in snapshot.children {

            let receivePostSnapshot = child.childSnapshotForPath("receivePost")
            let coordinates = receivePostSnapshot.childSnapshotForPath("userCoord").value as! [String: AnyObject]
            let lat = coordinates["lat"] as! Double
            let long = coordinates["long"] as! Double
            let position = CLLocationCoordinate2DMake(lat, long)

            let marker = GMSMarker(position: position)

            let status = receivePostSnapshot.value!["status"] as! Bool

            if status {
                // marker will be placed on the map
                marker.map = self.mapView

            } else {
                // if status equal false marker need to dissapear
                print("status will not show")

                // for somereason the maker is is not dissapearing
                if marker != nil {

                    marker.map = nil
                }

            }

        }

    })

}

Answer 1

首先检查两件事： -

1。）您是否在mapView中设置了viewDidLoad的委托，如果未在viewDidLoad函数中设置mapView.delegate = self

2.。）尝试打印status和position，并检查收到的位置和状态是否与您的数据库匹配。

如果以上两者都没问题，那么试试这个： -

 let location = CLLocationCoordinate2D(latitude: lat, longitude: long)

 if let status = receivePostSnapshot.Value!["status"] as! Bool{

        if status == true {
            let marker = GMSMarker(position: location)
            marker.map = self.mapView

        } else if (status == false && marker != nil){

                marker.map = nil

          }
        }else{

        if marker != nil {

                marker.map = nil
            }


  }

谷歌地图摆脱标记

1 个答案: