swift - 如何观察然后从 firebase 数据库连续快速写入

Question

我无法从 firebase 观察当前数据，然后将该数据加 1 并将其写回 firebase；但是我目前的代码似乎是一个永无止境的循环

func likevideoFirebase(row : Int){
    let videoKey = instanceOfUser.myVideos[instanceOfUser.indexNumber].videoKey
    let ref =  Database.database().reference()
    let userKey = instanceOfUser.myVideos
    ref.child("Vidpost").child(videoKey).child("video").child(userKey).child("like").child("count").observe(.value) { (snapshot) in

        var value = snapshot.value as? Int ?? 0
        value += 1; self.instanceOfUser.myVideos[self.instanceOfUser.indexNumber].sentVideo[row].like.numberOfLike  = value

       // this where I set the data I received add 1 to it and use the function below to add it to firebase , but instead it ends up a being a never ending loop  

        self.setliketofirebase(like: value, row: row)
    }
}

func setliketofirebase(like : Int ,row : Int ){
    let videoKey = instanceOfUser.myVideos[instanceOfUser.indexNumber]
    let ref =  Database.database().reference()
    guard let userKey = Auth.auth().currentUser?.uid else {return}
ref.child("Vidpost").child(videoKey).child("video").child(userKey).child("like").child("count").setValue(like)
}

Answer 1

你可以试试这个代码 -

ref.child("Vidpost").child(videoKey).child("video").child(userKey).child("like").child("count").setValue(like).updateChildValues(["count": like])

每次使用 setvalue() 时，您之前的值都会被替换。