ios – 使用Swift 3时的’InvalidPathValidation’

我有一个使用Firebase在用户之间发送和接收消息的应用.在将我的代码更新到新的 Swift 3以便我可以将iOS 10的酷炫新功能添加到我的应用程序的过程中,我遇到了几个错误.我能够在运行时修复除了这一个之外的大多数：

TerminaTing app due to uncaught exception 'InvalidPathValidation',reason: '(child:) Must be a non-empty String and not contain '.' '#' '$' '[' or ']''

我不知道是什么导致了这一点.用户的userID在登录时会打印到控制台,但是一旦按下登录按钮,我的应用程序就会崩溃.在我更新到Swift 3之前,这个错误是不存在的,实际上只有在我修复了应用程序的另一部分中的错误之后才出现.

无论如何,我的应用程序中只有两个主要类：LoginViewController和ChatViewController.

这是LoginViewController的代码：

import UIKit
import Firebase

class LoginViewController: UIViewController {

    // MARK: Properties
    var ref: FIRDatabaseReference! // 1
    var userID: String = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        ref = FIRDatabase.database().reference() // 2
    }

    @IBACtion func loginDidTouch(_ sender: AnyObject) {
        FIRAuth.auth()?.signInAnonymously() { (user,error) in
            if let user = user {
                print("User is signed in with uid: ",user.uid)
                self.userID = user.uid
            } else {
                print("No user is signed in.")
            }

            self.performSegue(withIdentifier: "Logintochat",sender: nil)

        }

    }

    override func prepare(for segue: UIStoryboardSegue,sender: AnyObject?) {
        super.prepare(for: segue,sender: sender)
        let navVc = segue.desTinationViewController as! UINavigationController // 1
        let chatVc = navVc.viewControllers.first as! ChatViewController // 2
        chatVc.senderId = userID // 3
        chatVc.senderDisplayName = "" // 4
    }


}

这是我的ChatViewController代码：

import UIKit
import Firebase
import JSQmessagesViewController

class ChatViewController: JSQmessagesViewController {

    // MARK: Properties

    var rootRef = FIRDatabase.database().reference()
    var messageRef: FIRDatabaseReference!

    var messages = [JSQmessage]()
    var outgoingBubbleImageView: JSQmessagesBubbleImage!
    var incomingBubbleImageView: JSQmessagesBubbleImage!

    var userIsTypingRef: FIRDatabaseReference! // 1
    private var localTyping = false // 2
    var isTyping: Bool {
        get {
            return localTyping
        }
        set {
            // 3
            localTyping = newValue
            userIsTypingRef.SETVALue(newvalue)
        }
    }
    var usersTypingQuery: FIRDatabaseQuery!


    override func viewDidLoad() {
        super.viewDidLoad()
        title = "ChatChat"
        setupBubbles()
        // No avatars
        collectionView!.collectionViewLayout.incomingAvatarViewSize = CGSize.zero
        collectionView!.collectionViewLayout.outgoingAvatarViewSize = CGSize.zero
        messageRef = rootRef.child("messages")
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        observemessages()
        observeTyping()
    }

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
    }


    func collectionView(collectionView: JSQmessagesCollectionView!,messageDataForItemATindexPath indexPath: NSIndexPath!) -> JSQmessageData! {
        return messages[indexPath.item]
    }

    func collectionView(collectionView: JSQmessagesCollectionView!,messageBubbleImageDataForItemATindexPath indexPath: NSIndexPath!) -> JSQmessageBubbleImageDatasource! {
        let message = messages[indexPath.item] // 1
        if message.senderId == senderId { // 2
            return outgoingBubbleImageView
        } else { // 3
            return incomingBubbleImageView
        }
    }

    override func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: int) -> Int {
        return messages.count
    }

    func collectionView(collectionView: JSQmessagesCollectionView!,avatarImageDataForItemATindexPath indexPath: NSIndexPath!) -> JSQmessageAvatarImageDatasource! {
        return nil
    }

    private func setupBubbles() {
        let factory = JSQmessagesBubbleImageFactory()
        outgoingBubbleImageView = factory?.outgoingmessagesBubbleImage(
            with: UIColor.jsq_messageBubbleBlue())
        incomingBubbleImageView = factory?.incomingmessagesBubbleImage(
            with: UIColor.jsq_messageBubbleLightGray())
    }

    func addmessage(id: String,text: String) {
        let message = JSQmessage(senderId: id,displayName: "",text: text)
        messages.append(message!)
    }

    override func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell{
        let cell = super.collectionView(collectionView,cellForItemAt: indexPath) as! JSQmessagesCollectionViewCell

        let message = messages[indexPath.item]

        if message.senderId == senderId {
            cell.textView!.textColor = UIColor.white()
        } else {
            cell.textView!.textColor = UIColor.black()
        }

        return cell
    }

    func didPressSendButton(button: UIButton!,withmessage@R_893_3801@: String!,senderId: String!,senderDisplayName: String!,date: NSDate!) {

        let itemRef = messageRef.childByAutoId() // 1
        let messageItem = [ // 2
            "text": text,"senderId": senderId
        ]
        itemRef.SETVALue(messageItem as? AnyObject) // 3

        // 4
        JSQSystemSoundPlayer.jsq_playmessageSentSound()

        // 5
        finishSendingmessage()

        isTyping = false

    }

    private func observemessages() {
        // 1
        let messagesQuery = messageRef.queryLimited(toLast: 25)
        // 2
        messagesQuery.observe(.childAdded) { (snapshot: FIRDataSnapshot!) in
            // 3
            let id = snapshot.value!["senderId"] as! String
            let text = snapshot.value!["text"] as! String

            // 4
            self.addmessage(id: id,text: text)

            // 5
            self.finishReceivingmessage()
        }
    }

    private func observeTyping() {
        let typingInDicatorRef = rootRef.child("typingInDicator")
        userIsTypingRef = typingInDicatorRef.child(senderId)
        userIsTypingRef.onDisconnectRemoveValue()

        // 1
        usersTypingQuery = typingInDicatorRef.queryorderedByValue().queryEqual(toValue: truE)

        // 2
        usersTypingQuery.observe(.value) { (data: FIRDataSnapshot!) in

            // 3 You're the only typing,don't show the inDicator
            if Data.childrenCount == 1 && self.isTyping {
                return
            }

            // 4 Are there others typing?
            self.showTypingInDicator = data.childrenCount > 0
            self.scrollToBottom(animated: truE)
        }
    }

    override func textViewDidChange(_ textView: UITextView) {
        super.textViewDidChange(textView)
        // If the text is not empty,the user is typing
        isTyping = textView.text != ""
    }

    func collectionView(collectionView: JSQmessagesCollectionView!,attributedTextForCellBottomLabelATindexPath indexPath: NSIndexPath!) -> AttributedString! {
        return AttributedString(String:"test")
    }

}

记住,所有这些代码都是用Swift 3编写的.

如果您能找到任何可以帮助我解决问题并最终让我的应用程序运行的东西,我将成为您最好的朋友.

提前致谢！