NSFastEnumerationIterator.Element（又名 Any）不符合协议 'AnyObject'

Question

升级到 Xcode 8 (Swift 3) 后，当我尝试遍历快照中的子记录时，我的 Firebase 查询出现错误 NSFastEnumerationIterator.Element (aka Any) does not conform to protocol 'AnyObject'：

for child in snapshot.children {
                if (child as AnyObject).value!["postedBy"] != nil {

Xcode 将 child.value["postedBy"] 更改为 (child as AnyObject).value!["postedBy"]，这会引发错误。然后我尝试将其更改为

((child as AnyObject).value as? NSDictionary)["postedBy"] != nil

但随后会抛出一个不同的错误 Binary operator != cannot be applied to operands of type _ and _

我的方向对吗？任何帮助将不胜感激。

谢谢！！

最终解：

for child in snapshot.children{
                if let postedBy = (snapshot.value as? NSDictionary)?["postedBy"] as? String {

Answer 1

尝试：-

  for child in snapshot.children{
            if let postedBy = child.value!["postedBy"] as? String { .. }}

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