Ich versuche, Firebase abzufragen, um zu überprüfen, ob ein Benutzer mitwaiting: "1" und dann, wenn der Schnappschuss zurückgegeben wird, möchte ich sehen, ob es gleich Null ist. Ich habe versucht, dies zu tun, aber die Methode, die ich verwendet habe, funktioniert nicht und ich habe nur eine Art von Ausgabe, wenn der Schnappschuss nicht gleich Null ist. Ich habe den aktuellen Code und den JSON-Text von Firebase hinzugefügt.

import UIKit
import Firebase
import Spring

class GamesViewController: UIViewController {

let ref = Firebase(url: "https://123test123.firebaseio.com")
var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()   

@IBAction func StartGamePressed(sender: AnyObject) {
    print("test1")
    var peopleWaiting: [String] = []

    let userRef = Firebase(url:"https://123test123.firebaseio.com/users")
    userRef.queryOrderedByChild("waiting").queryEqualToValue("1")
        .observeEventType(.ChildAdded, withBlock: { snapshot in
            print(snapshot.key)
            if snapshot.key == nil {
                print("test2")
                let userData = ["waiting": "1"]
                let usersRef = self.ref.childByAppendingPath("users")
                let hopperRef = usersRef.childByAppendingPath("\(self.ref.authData.uid)")

                hopperRef.updateChildValues(userData, withCompletionBlock: {
                    (error:NSError?, ref:Firebase!) in
                    if (error != nil) {
                        print("Data could not be saved.")
                        self.displayAlert("Oops!", message: "We have been unable to get you into a game, check you have an internet conection. If this problem carries on contect support")
                    } else {
                        print("Data saved successfully!")
                        let storyboard = UIStoryboard(name: "Main", bundle: nil)
                        let Home : UIViewController = storyboard.instantiateViewControllerWithIdentifier("continueToGame")
                        self.presentViewController(Home, animated: true, completion: nil)

                    }

                })


            } else {
                var randomUID: String
                peopleWaiting.append(snapshot.key)
                let randomIndex = Int(arc4random_uniform(UInt32(peopleWaiting.count)))
                randomUID = peopleWaiting[randomIndex]
                print(randomUID)
                let storyboard = UIStoryboard(name: "Main", bundle: nil)
                let Home : UIViewController = storyboard.instantiateViewControllerWithIdentifier("continueToGame")
                self.presentViewController(Home, animated: true, completion: nil)

            }
        })
}

func displayAlert(title: String, message: String){

    let formEmpty = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
    formEmpty.addAction((UIAlertAction(title: "Ok", style: .Default, handler: { (action) -> Void in

    })))

    self.presentViewController(formEmpty, animated: true, completion: nil)
}

func activityIndicatorFunction(){

    activityIndicator = UIActivityIndicatorView(frame: CGRectMake(0, 0, 100, 100))
    activityIndicator.backgroundColor = UIColor(red:0.16, green:0.17, blue:0.21, alpha:1)
    activityIndicator.layer.cornerRadius = 6
    activityIndicator.center = self.view.center
    activityIndicator.hidesWhenStopped = true
    activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge
    view.addSubview(activityIndicator)
    activityIndicator.startAnimating()
    UIApplication.sharedApplication().beginIgnoringInteractionEvents()

}


}

JSON-Daten:

{
"68e42b7f-aea5-4c3f-b655-51a99cb05bb0" : {
  "email" : "[email protected]",
  "username" : "test1",
  "waiting" : "0"
},
"8503d5a8-fc4a-492b-9883-ec3664898b4f" : {
  "email" : "[email protected]",
  "username" : "test2",
  "waiting" : "0"
}
}