3
我有一個應用程序使用Firebase在用戶之間發送和接收消息。在將我的代碼更新到新的Swift 3的過程中，我可以將iOS 10的酷炫新功能添加到我的應用程序中，但遇到了一些錯誤。我能夠修復其中的大多數，除了這一個在運行時：使用Swift 3時'InvalidPathValidation'
Terminating app due to uncaught exception 'InvalidPathValidation', reason: '(child:) Must be a non-empty string and not contain '.' '#' '$' '[' or ']''
我不知道可能導致這一點。用戶的用戶ID在登錄時被打印到控制檯，但是一旦登錄按鈕被按下，我的應用就會崩潰。在我更新到Swift 3之前，這個錯誤並不存在，實際上只有在我修復了我的應用程序的另一部分中的錯誤後纔出現。
無論如何，我的應用程序中只有兩個主類：LoginViewController和ChatViewController。
這裏是LoginViewController代碼：
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
}
}
這裏是我的ChatViewController代碼：
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!, withMessageText text: 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")
}
}
精神，所有這些代碼是寫在斯威夫特3.
如果您可以找到任何能夠幫助我解決問題的東西，並最終讓我的應用程序工作，我將成爲您最好的朋友。
在此先感謝！
謝謝，是的，我認爲這是一個失敗的實驗哈哈我最好的選擇是回到什麼可行，等待一個穩定的版本 –
請[不要發佈相同的答案多個問題]（https://meta.stackexchange.com/q/104227）。發佈一個很好的答案，然後投票/標記以重複關閉其他問題。如果問題不重複，*定製您對問題*的答案。 –