swift - 从 Firebase [GeoFire] 中删除位置 - Swift

Question

我有两个屏幕，比如 A 和 B。在屏幕 A 上，我将用户的当前位置存储在我的 Firebase 数据库中。

代码

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

    SVProgressHUD.show(withStatus: "Fetching your location")

    backButton.isEnabled = false
    competitiveMatch.isEnabled = false
    friendlyMatch.isEnabled = false
    tournamentButton.isEnabled = false
    trainingButton.isEnabled = false
    nextButton.isEnabled = false

    let location = locations[locations.count - 1]

    if location.horizontalAccuracy > 0 {
        self.locationManager.stopUpdatingLocation()

        let userLatitude = location.coordinate.latitude
        let userLongitude = location.coordinate.longitude


        saveCurrentLocation(long: userLongitude, lat: userLatitude)

    }
}

func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
    print(error)
}

函数 saveCurrentLocation 也在同一文件中声明为:

func saveCurrentLocation(long: Double, lat: Double){

    let geofireRef = FIRDatabase.database().reference().child("Locations")
    let geoFire = GeoFire(firebaseRef: geofireRef)

    let userID = FIRAuth.auth()?.currentUser?.uid
    geoFire.setLocation(CLLocation(latitude: lat, longitude: long), forKey: userID!) { (error) in
        if (error != nil) {
            print("An error occured: \(String(describing: error))")

            self.backButton.isEnabled = true
            self.competitiveMatch.isEnabled = true
            self.friendlyMatch.isEnabled = true
            self.tournamentButton.isEnabled = true
            self.trainingButton.isEnabled = true
            self.nextButton.isEnabled = true

        } else {
            print("Saved location successfully!")

            self.backButton.isEnabled = true
            self.competitiveMatch.isEnabled = true
            self.friendlyMatch.isEnabled = true
            self.tournamentButton.isEnabled = true
            self.trainingButton.isEnabled = true
            self.nextButton.isEnabled = true

            SVProgressHUD.dismiss()
        }
    }
}

在屏幕 B 上，我有一个注销按钮。我想从 Firebase 数据库中注销用户，并在他按下按钮时也删除他保存的位置。

为此，我首先在 ViewController 类之上声明以下内容:

let userID = FIRAuth.auth()?.currentUser?.uid

然后，我使用以下代码:

func deleteUserLocation(){

    let geofireRef = FIRDatabase.database().reference().child("Locations")
    let geoFire = GeoFire(firebaseRef: geofireRef)

    geoFire.removeKey(userID!)

    print("Deleted location.")
}

//Logout Button is pressed and it takes us back to the landing page.
@IBAction func logoutPressed(_ sender: Any) {
    deleteUserLocation()

    do {
        try FIRAuth.auth()?.signOut()
    }
    catch {
        print("Error: There was a problem signing out!")
    }
}

执行此操作后，“已删除位置”会打印在控制台中，但该位置不会从数据库中删除。

作为引用，这里是数据库的快照；

Answer 1

你只需要删除数据库中的de child。

    if geoFire!= nil {
        geoFire?.removeKey(userID!)
        geofireRef.child(userID!).removeValue()
        geoFire= nil
    }

或

     geoFire?.firebaseRef.removeValue()