xcode - 从 Firebase 数据库中检索数据 : unrecognized selector sent to instance

Question

我有一个 Firebase 数据库，如下所示:

我保存到数据库没有问题，但是当我尝试通过以下方式检索数据时:

//Properties
@IBOutlet weak var bike1LBL: UILabel!
@IBOutlet weak var bike2LBL: UILabel!
@IBOutlet weak var bike3LBL: UILabel!
@IBOutlet weak var bike4LBL: UILabel!
@IBOutlet weak var chainLBL: UILabel!
@IBOutlet weak var brakeLBL: UILabel!
@IBOutlet weak var locationLBL: UILabel!
@IBOutlet weak var phoneLBL: UILabel!


override func viewDidLoad() {
    super.viewDidLoad()

    var ref = Firebase(url:"sdfghjkl/firebaseio.com/Order/")
    // Retrieve new posts as they are added to database
    ref.observeEventType(.ChildAdded, withBlock: { snapshot in

        let road = snapshot.value.objectForKey("Bike-Type1") as? String
        self.bike1LBL.text = road
        let city = snapshot.value.objectForKey("Bike-Type2") as? String
        self.bike2LBL.text = city
        let mountain = snapshot.value.objectForKey("Bike-Type3") as? String
        self.bike3LBL.text = mountain
        let christiania = snapshot.value.objectForKey("Bike-Type4") as? String
        self.bike4LBL.text = christiania
        let chain = snapshot.value.objectForKey("Chain") as? String
        self.chainLBL.text = chain
        let brake = snapshot.value.objectForKey("Brake") as? String
        self.brakeLBL.text = brake
        let location = snapshot.value.objectForKey("Location") as? String
        self.locationLBL.text = location
        let phone = snapshot.value.objectForKey("Phone") as? String
        self.phoneLBL.text = phone
        print(snapshot.value)
    })
}

应用程序崩溃并且我收到此错误消息，但这就是我从调试器得到的全部信息:

Answer 1

如果您更新到新的 Firebase 3.0 api 并查看 MakinGIANTS - Post 会更好关于 firebase 和查询(它在 Kotlin 中，但“看起来像”Swift)并且可能会有所帮助