ios - Firebase使用Swift 3.0返回Optional()

Question

自更新至Swift 3.0以来，这段代码现在在应用程序中将数据显示为Optional('data')。任何的想法？

let ring1FightRef = FIRDatabase.database().reference().child("Ring1Fighting")


@IBOutlet weak var ring1Fighting: UILabel!

这是viewDidLoad中的代码

ring1FightRef.observe(.value) { (snap: FIRDataSnapshot) in self.ring1Fighting.text = (snap.value as AnyObject).description
    }

Answer 1

您只需要解开收到的值即可:-

FIRDatabase.database().reference().child("Ring1Fighting").observe(.value) { (snap: FIRDataSnapshot) in

        print((snap.value as! String))


    }