Swift Firebase Access子快照数据 [英] Swift Firebase Access child snapshot data

问题描述

我当前正在尝试从Swift中的子快照访问数据.这是我的代码(在Swift 3/Firebase更新之前有效):

I am currently trying to access data from a child snapshot in Swift. Here is my code that I have (which worked before the Swift 3/Firebase update):

 if let achievements = snapshot1.childSnapshotForPath("Achievements").children.allObjects as? [FIRDataSnapshot] {


                    if achievements.count != 0 {

                        if let val = achievements[0].value!["somevalue"] as? Int {
                            self.dict["somevalue"] = val
                        }


                    }

所以我在这里想要做的是创建一个子快照(成就)的变量，并从中访问子快照数据.成就[0]将仅返回第一个值.但是，这似乎不起作用.我应该如何处理?

So what I am trying to do here, is to create a variable of a child snapshot (achievements), and access child snapshot data from it. The achievements[0] will simply return the very first value. However, this doesn't seem to work. How should I approach this?

我目前已经在快照中("observeType:.ChildAdded")进行了此操作

I am currently doing this inside a snapshot already (of 'observeType:.ChildAdded')

我的Firebase数据库如下:

My Firebase DB looks like this:

Achievements{

randomId1 {
somevalue : somevalue
}

randomId2 {
somevalue2 : somevalue2
}
}

更新的代码:

 func loadData() {

        ref.child("Players").observe(FIRDataEventType.childAdded) { (snapshot:FIRDataSnapshot) in

            if let value = snapshot.value as? [String:AnyObject], let username = value["Username"] as? String {

            }

            if let value = snapshot.value as? [String:AnyObject], let ranking = value["Rank"] as? String {

            }

            if let childSnapshot = snapshot.childSnapshot(forPath: "Achievements").children.allObjects as? [FIRDataSnapshot] {

                if childSnapshot.count != 0 {

                    if let achievement1 = childSnapshot[0].value!["Rookie"] as? String {
                        print(achievement1)
                    }

                }
            }

        }

    }

JSON树:

Players {

PlayerID {

Username

Rank

Achievements {

Rookie: yes

}


}

推荐答案

尝试:-

 if let childSnapshot = snapshot.childSnapshot(forPath: "Achievements") as? FIRDataSnapshot{

                if let achievementDictionary = childSnapshot.value as? [String:AnyObject] , achievementDictionary.count > 0{

                    if let achieveMedal = achievementDictionary["Rookie"] as? String {

                        print(achieveMedal)

             }        
       }
    }

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