Ios Swift3中的Firebase查询错误：类型'；NSFastEnumerationIterator.Element'；（aka'；Any'；）不符合协议'；任何对象'；

我不知道如何修复这个错误。有人能解释一下吗

Type 'NSFastEnumerationIterator.Element' (aka 'Any') does not conform to protocol 'AnyObject'

这是我的问题

media24HourQuery.observe(FIRDataEventType.value, with: { snapshot in

        var newItems = [[String: AnyObject]]()

        for child in snapshot.children {
            let title = (child as AnyObject).value["title"] as? String
            let userID = (child as AnyObject).value["userID"] as? String
            let mediaID = (child as AnyObject).value["mediaID"] as? String
            let timestamp = (child as AnyObject).value["timestamp"] as? Double

编辑：这也不行（一切都是零）

如果我打印（孩子），我得到的是：

    // print(child)
    Snap (XsUwNDQB3qPdjYFCOLzANmsjjpf1-1474144681) {
    mediaID = "XsUwNDQB3qPdjYFCOLzANmsjjpf1-1474144681";
    timestamp = 1474144681490;
    title = "outside sep 17";
    userID = XsUwNDQB3qPdjYFCOLzANmsjjpf1;
}

编辑：解决了。这项工作：

            let snapDic = snapshot.value as? NSDictionary
        for child in snapDic! {
            print (child)

            let childDic = child.value as? NSDictionary

            let title  = childDic?["title"] as? String
            let userID = childDic?["userID"] as? String
            let mediaID = childDic?["mediaID"] as? String
            let timestamp = childDic?["timestamp"] as? Double

---

该解决方案中的答案对我不适用。@markthrow您能找到解决方案吗

            let snapDic = snapshot.value as? NSDictionary
        for child in snapDic! {
            print (child)

            let childDic = child.value as? NSDictionary

            let title  = childDic?["title"] as? String
            let userID = childDic?["userID"] as? String
            let mediaID = childDic?["mediaID"] as? String
            let timestamp = childDic?["timestamp"] as? Double