swift - 快照值作为 int 导致崩溃

Question

因此，我正在发出好友请求，在获取这些请求后，我收到了错误。

this class is not key value coding-compliant for the key xxx

发送请求工作正常(these are the values from sending a request):

let fromId = (Auth.auth().currentUser!.uid)
        let toId = self.otherUser?["uid"] as! String

        let senderFriendRef = databaseRef.child("friendship").child(fromId)
        senderFriendRef.updateChildValues([toId : 0])
        let receiverFriendRef = databaseRef.child("friendship").child(toId)
         receiverFriendRef.updateChildValues([fromId : 1])

这是获取请求的代码。我玩弄了 if (snapshot.value as? Int == 1) ，这似乎会导致崩溃，因为在我收到错误说我无法将其转换为 Int:

if let loggedInUser = Auth.auth().currentUser?.uid {
    Database.database().reference().child("friendship").child(loggedInUser).observe(.childAdded) { (snapshot) in
        if (snapshot.value as? Int == 1) {
            let requestId = snapshot.key
            Database.database().reference().child("users").child(requestId).observeSingleEvent(of: .value, with: { (snapshot) in
                if let dict = snapshot.value as? [String : AnyObject] {
                    let person = Person()//model
                    person.setValuesForKeys(dict)
                    person.id = requestId
                    self.friendRequest.append(person)
                    print(self.friendRequest)
                    DispatchQueue.global().async {
                        DispatchQueue.main.async {
                            self.collectionView.reloadData()
//ending brackets

Answer 1

永远不要使用setValuesForKeys，你只会遇到很多问题。 This其他帖子帮助我解决了这个问题。