观察Firebase DB的歧义使用 [英] Ambiguous use of observe firebase DB

问题描述

我真的无法理解出什么问题了吗?
我正在尝试从Firebase Settings节点加载一些设置数据.其他功能中其他节点的相同代码也可以工作，但是这是模棱两可的.为什么?

I really cannot get what is wrong?
I'm trying to load some settings data from firebase Settings node. Same code for other nodes in other functions work but this one is ambiguous. Why?

var ref:FIRDatabaseReference!  //Global variable

     override func viewDidLoad() {
        super.viewDidLoad()


        self.mapView.delegate = self

            if CLLocationManager.locationServicesEnabled() {

                locationManager.delegate = self
                locationManager.desiredAccuracy = kCLLocationAccuracyBest
                locationManager.requestWhenInUseAuthorization()
                locationManager.startUpdatingLocation()

              //  monitorRegion()

            } else {

                // Alert to enable location services on iphone first
            }

            ref = FIRDatabase.database().reference(fromURL: "https://*******.firebaseio.com/")
            //The error is here
            ref.child("Settings").child("service_types").observe(.value) { (snapshot) in

            }


        // Do any additional setup after loading the view.
    }

推荐答案

更改此内容:

ref.child("Settings").child("service_types").observe(.value) { (snapshot) in

}

对此:

ref.child("Settings").child("service_types").observe(.value, with: { snapshot in

})

另请参见 firebase文档部分监听价值事件

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