Question

您好我有一个使用firebase的取消关注/关注系统，但它非常迟钝。如果我按下按钮100次，有时会从跟随切换到取消关注。数据有效，但它很混乱，因为当我关注用户并想要取消关注时，它会显示如下，但我需要文本说取消关注以删除值。顶部代码是检查当前用户是否跟随并设置按钮文本，第二个代码是设置数据的代码。

修改

我检查了我的数据库，发生的事情是它正在创建另一个重复值并同时删除它....任何想法如何解决这个问题？

Database.database().reference().child("Businesses").child(self.loggedInUser!.uid).child("following").queryOrderedByKey().observe(.value, with: { (snapshot) in
        if let following = snapshot.value as? [String : AnyObject] {
            for (_, value) in following {
                if value as! String == self.otherUser?["uid"] as! String {
                    self.follow.setTitle("Unfollow", for: .normal)
                    print("You are following the user")
                } else {
                    self.follow.setTitle("Follow", for: .normal)
                    print("You are not following the user")
                }
            }
        }
    })


@IBAction func followButton(_ sender: Any) {

    let userID = Auth.auth().currentUser!.uid
    let ref = Database.database().reference()
    let key = ref.child("Businesses").childByAutoId().key



    ref.child("Businesses").child(userID).child("following").queryOrderedByKey().observeSingleEvent(of: .value, with: { snapshot in

        if let following = snapshot.value as? [String : AnyObject] {
            for (item, value) in following {
                if value as! String == self.otherUser?["uid"] as! String {

                    ref.child("Businesses").child(userID).child("following/\(item)").removeValue()
                    ref.child("Businesses").child(self.otherUser?["uid"] as! String).child("followers/\(item)").removeValue()

                }
            }
        }

        // Follow
        if(self.follow.titleLabel?.text == "Follow") {

            let following = ["following/\(key)" : self.otherUser?["uid"] as! String]
            let followers = ["followers/\(key)" : userID]

            ref.child("Businesses").child(userID).updateChildValues(following as Any as! [AnyHashable : Any])
            ref.child("Businesses").child(self.otherUser?["uid"] as! String).updateChildValues(followers)

        }
    })
}

Swift Firebase关注/取消关注非常滞后

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