模糊使用下标（Swift 3） [英] Ambiguous Use of Subscript (Swift 3)

问题描述

我在下面的代码中使用下面的代码不正确地用于这个Firebase数据拉，但是我无法弄明白我做错了什么。我得到一个错误的使用下标的 let uniqueID = each.value [唯一ID事件号]为！ Int 行。

I am using the subscript in the following code incorrectly for this Firebase data pull, but I can't figure out what I am doing wrong. I get an error of Ambiguous use of subscript for the let uniqueID = each.value["Unique ID Event Number"] as! Int line.

// Log user in
if let user = FIRAuth.auth()?.currentUser {

       let uid = user.uid
       // values for vars sevenDaysAgo and oneDayAgo set here

       ...

       let historyRef = self.ref.child("historyForFeedbackLoop/\(uid)")
            historyRef.queryOrdered(byChild: "Unix Date").queryStarting(atValue: sevenDaysAgo).queryEnding(atValue: oneDayAgo).observeSingleEvent(of: .value, with: { snapshot in

                if (snapshot.value is NSNull) {
                    print("user data not found")
                }
                else {

                    if let snapDict = snapshot.value as? [String:AnyObject] {

                        for each in snapDict {

                            // Save the IDs to array.
                            let uniqueID = each.value["Unique ID Event Number"] as! Int
                            self.arrayOfUserSearchHistoryIDs.append(uniqueID)
                        }

                    }
                    else{
                        print("SnapDict is null")
                    }
                }
       })
}

我试图应用我从这个<一个href =http://stackoverflow.com/questions/33642059/ambiguous-use-of-subscript-in-swift> post ，但是我无法弄清楚我失踪了，因为我以为我让编译器知道什么类型的字典与as？ [String：AnyObject]

I tried to applying what I learned from this post, but I couldn't figure out what I am missing because I thought I was letting the compiler know what type of dictionary it is with the "as? [String:AnyObject]"

非常感谢任何想法或想法！

Any thoughts or ideas would be greatly appreciated!

推荐答案

我最喜欢处理数据的方法是尽可能地打开 FIRDataSnapshot 。

ref!.observe(.value, with: { (snapshot) in
    for child in snapshot.children {
        let msg = child as! FIRDataSnapshot
        print("\(msg.key): \(msg.value!)")
        let val = msg.value! as! [String:Any]
        print("\(val["name"]!): \(val["message"]!)")
    }
})

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