应用程序在CLLocationCoordinate2DMake - swift崩溃

Question

下面是我的getMapAnnotations()函数，该函数从firebase数据库获取纬度和经度信息，并将这些注释添加到mapView中：

func getMapAnnotations()  {
    print("aa")
    var refHandle = self.ref.child("tasks").observeEventType(FIRDataEventType.Value, withBlock: { (snapshot) in
        let tasksDict = snapshot.value as? NSDictionary
        print("bb")
        for i in 0 ..< tasksDict!.count {
                let taskId = tasksDict!.allKeys[i] as! String
                print (taskId)
                let task = tasksDict!.objectForKey(taskId) as! NSDictionary
                print (task)
                let lat = task.objectForKey("latitude") as! String
                let long = task.objectForKey("longitude") as! String
                let latNum = Double(lat)
                let longNum = Double(long)
                let latDegrees: CLLocationDegrees = latNum!
                let longDegrees: CLLocationDegrees = longNum!
                let pointLocation: CLLocationCoordinate2D = CLLocationCoordinate2DMake(latDegrees, longDegrees)
                let point = MKPointAnnotation()
                point.coordinate = pointLocation
                point.title = task.objectForKey("title") as? String
                self.homeMap.addAnnotation(point)
                print("point added")

        }

当视图控制器加载并且断点位于pointLocation声明处时，应用程序将变得无响应。是不是有什么我没做的事？谢谢。

Answer 1

我在那一行设置了一个断点。哦，天哪，这太尴尬了。