当我尝试写一条消息时，它会崩溃。我似乎无法在这里找到错误。我得到一个Thread 1: EXC_BAD_INSTRUCTION (code=EXC)_1386_INVOP, subcode=0x0.我试图找到我的字符串上的问题。对不起，我只是新的xcode
完整代码位于下方
import UIKit
import JSQMessagesViewController
import MobileCoreServices
import AVKit
import FirebaseDatabase
class ChatViewController: JSQMessagesViewController {
var messages = [JSQMessage]()
var messageRef = FIRDatabase.database().reference().child("messages")
override func viewDidLoad() {
super.viewDidLoad()
self.senderId = "1"
self.senderDisplayName = "Ej"
//messageRef.childByAutoId().setValue("first message")
//messageRef.childByAutoId().setValue("2nd")
// messageRef.observeEventType(FIRDataEventType.Value) { (snapshot: FIRDataSnapshot) in
// if let dick = snapshot.value as? NSDictionary {
// print(dick)
// }
// }
observeMessages()
}
func observeMessages(){
messageRef.observeEventType(.ChildAdded, withBlock: { snapshot in
//print(snapshot.value)
if let dick = snapshot.value as? [String: AnyObject]{
//let Mediatype = dick["Mediatype"] as! String
let senderId = dick["senderId"] as! String
let senderName = dick["senderName"] as! String
let text = dick["text"] as! String
self.messages.append(JSQMessage(senderId: senderId, displayName: senderName, text: text))
self.collectionView.reloadData()
}
})
}
//Send Btn
override func didPressSendButton(button: UIButton!, withMessageText text: String!, senderId: String!, senderDisplayName: String!, date: NSDate!) {
//Messages
//messages.append(JSQMessage(senderId: senderId, displayName: senderDisplayName, text: text))
//self.collectionView.reloadData()
// print(messages)
let newMessage = messageRef.childByAutoId()
let messageData = ["text": text, "senderId": senderId, "senderName": senderDisplayName, "Mediatype": "TEXT"]
newMessage.setValue(messageData)
}
//File btn
override func didPressAccessoryButton(sender: UIButton!) {
// ALERT WHEN PRESSED ACCESSORY
let sheet = UIAlertController(title: "Media Messages", message: "Select A Media", preferredStyle: UIAlertControllerStyle.ActionSheet)
let cancel = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) { (alert:UIAlertAction) in
}
let photoLibrary = UIAlertAction(title: "Photo Library", style: UIAlertActionStyle.Default) { (alert: UIAlertAction) in
self.getMediaFrom(kUTTypeImage)
}
let videoLibrary = UIAlertAction(title: "Video Library", style: UIAlertActionStyle.Default) { (alert: UIAlertAction) in
self.getMediaFrom(kUTTypeMovie)
}
sheet.addAction(photoLibrary)
sheet.addAction(videoLibrary)
sheet.addAction(cancel)
self.presentViewController(sheet, animated: true, completion: nil)
//let imagePicker = UIImagePickerController()
//imagePicker.delegate = self
//self.presentViewController(imagePicker, animated: true, completion: nil)
}
func getMediaFrom(type: CFString) {
print(type)
let mediaPicker = UIImagePickerController()
mediaPicker.delegate = self
mediaPicker.mediaTypes = [type as String]
self.presentViewController(mediaPicker, animated: true, completion: nil)
}
override func collectionView(collectionView: JSQMessagesCollectionView!, messageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageData! {
return messages[indexPath.item]
}
//BUBBLE CHAT
override func collectionView(collectionView: JSQMessagesCollectionView!, messageBubbleImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageBubbleImageDataSource! {
let bubbleFactory = JSQMessagesBubbleImageFactory()
return bubbleFactory.outgoingMessagesBubbleImageWithColor(.lightGrayColor())
}
override func collectionView(collectionView: JSQMessagesCollectionView!, avatarImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageAvatarImageDataSource! {
return nil
}
override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print("number of items \(messages.count)")
return messages.count
}
override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = super.collectionView(collectionView, cellForItemAtIndexPath: indexPath) as! JSQMessagesCollectionViewCell
return cell
}
override func collectionView(collectionView: JSQMessagesCollectionView!, didTapMessageBubbleAtIndexPath indexPath: NSIndexPath!) {
print("didTappedMessageBubbleAtIndexPath \(indexPath.item)")
let message = messages[indexPath.item]
if message.isMediaMessage {
if let mediaitem = message.media as? JSQVideoMediaItem{
let player = AVPlayer(URL: mediaitem.fileURL)
let playerView = AVPlayerViewController()
playerView.player = player
self.presentViewController(playerView, animated: true, completion: nil)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func LogOutTapped(sender: AnyObject) {
print ("User Logged Out")
//Goes on to Chat View
//Main Stroryboard Interface
_ = UIStoryboard(name: "Main", bundle: nil)
//From MainStoryboard instatiate a navigation controller
let LoginVC = storyboard?.instantiateViewControllerWithIdentifier("LoginVC") as! LogInViewController
//Get app delegate
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
//Navigation Controller as root view controller
appDelegate.window?.rootViewController = LoginVC
}
}
extension ChatViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
print("finish picking")
print(info)
if let picture = info[UIImagePickerControllerOriginalImage] as? UIImage {
let photo = JSQPhotoMediaItem(image: picture)
messages.append(JSQMessage(senderId: senderId, displayName: senderDisplayName, media: photo))
}else if let video = info[UIImagePickerControllerMediaURL] as? NSURL{
let videoitem = JSQVideoMediaItem(fileURL: video, isReadyToPlay: true)
messages.append(JSQMessage(senderId: senderId, displayName: senderDisplayName, media: videoitem))
}
self.dismissViewControllerAnimated(true, completion: nil)
collectionView.reloadData()
}
}
答案 0 :(得分：0)
错误告诉您dick["text"]实际上是意外的零。
尝试这样做：
let text = dick["text"] ?? ""
应该用空字符串替换nil。
答案 1 :(得分：0)
我建议您查看guard声明。这是一个声明，可以让您检查可选＆＃34;？＆＃34;的值。如果它是零，那么它处理这种情况，因为如果你没有消息的所有必需信息。如果消息没有文本，您不希望在对话中显示它。它与您已经拥有的if let语句非常相似，但它使您无需在if let内嵌套if let
所以我建议你把逻辑变成更像这样的东西。
messageRef.observeEventType(.ChildAdded, withBlock: { snapshot in
guard let dick = snapshot.value as? [String: AnyObject] else { return }
// This will return if the snapshot cannot be mapped to the dictionary format [String: AnyObject]
guard let senderId = dick["senderId"] as! String, senderName = dick["senderName"] as! String, text = dick["text"] as! String else { return }
// This will return if the "dick" object does not contain all the elements necessary to create a JSQMessage
// Otherwise we want to add it to our messages list
self.messages.append(JSQMessage(senderId: senderId, displayName: senderName, text: text))
self.collectionView.reloadData()
}
现在你也想看看这个逻辑。您的dick对象看起来更像是一般消息对象。不管＆＃34;迪克＆＃34;曾经是发送消息的人。除非你引用＆＃34; dick＆＃34;特别是通过firebase的路径。从它的外观来看var messageRef = FIRDatabase.database().reference().child("messages")我认为它就是你在后端存储所有消息的地方。
我可能没有完全理解这里的目的，但我希望有所帮助。如果您有其他问题，请与我们联系。