我發送照片信息時出現了一些錯誤。爲什麼傳入的信息無法顯示在屏幕的左側?
我與迅速語言初學者。我想創建關於聊天應用程序的本科項目。我需要一些幫助來解決這個問題。一切都一直順利到現在,但我面臨一個小錯誤,即當我收到一個圖像,然後它不會出現在屏幕的左側,傳入和傳出的圖像出現在屏幕的右側。
import UIKit
import JSQMessagesViewController
import MobileCoreServices
import AVKit
import FirebaseDatabase
import FirebaseStorage
import FirebaseAuth
import SDWebImage
class ChatViewController: JSQMessagesViewController {
var messages = [JSQMessage]()
var avatarDict = [String: JSQMessagesAvatarImage]()
var messageRef = FIRDatabase.database().reference().child("messages")
override func viewDidLoad() {
super.viewDidLoad()
if let currentUser = FIRAuth.auth()?.currentUser
{
self.senderId = currentUser.uid
if currentUser.isAnonymous == true
{
self.senderDisplayName = "anonymous"
} else
{
self.senderDisplayName = "\(currentUser.displayName!)"
}
}
observeMessages()
}
func observeUsers(_ id: String)
{
FIRDatabase.database().reference().child("users").child(id).observe(.value, with: {
snapshot in
if let dict = snapshot.value as? [String: AnyObject]
{
let avatarUrl = dict["profileUrl"] as! String
self.setupAvatar(avatarUrl, messageId: id)
}
})
}
func setupAvatar(_ url: String, messageId: String)
{
if url != "" {
let fileUrl = URL(string: url)
let data = try? Data(contentsOf: fileUrl!)
let image = UIImage(data: data!)
let userImg = JSQMessagesAvatarImageFactory.avatarImage(with: image, diameter: 30)
self.avatarDict[messageId] = userImg
self.collectionView.reloadData()
} else {
avatarDict[messageId] = JSQMessagesAvatarImageFactory.avatarImage(with: UIImage(named: "profileImage"), diameter: 30)
collectionView.reloadData()
}
}
func observeMessages() {
messageRef.observe(.childAdded, with: { snapshot in
// print(snapshot.value)
if let dict = snapshot.value as? [String: AnyObject] {
let mediaType = dict["MediaType"] as! String
let senderId = dict["senderId"] as! String
let senderName = dict["senderName"] as! String
self.observeUsers(senderId)
switch mediaType {
case "TEXT":
let text = dict["text"] as! String
self.messages.append(JSQMessage(senderId: senderId, displayName: senderName, text: text))
case "PHOTO":
let photo = JSQPhotoMediaItem(image: nil)
let fileUrl = dict["fileUrl"] as! String
let downloader = SDWebImageDownloader.shared()
downloader.downloadImage(with: URL(string: fileUrl)!, options: [], progress: nil, completed: { (image, data, error, finished) in
DispatchQueue.main.async(execute: {
photo?.image = image
self.collectionView.reloadData()
})
})
self.messages.append(JSQMessage(senderId: senderId, displayName: senderName, media: photo))
if self.senderId == senderId {
photo?.appliesMediaViewMaskAsOutgoing = true
} else {
photo?.appliesMediaViewMaskAsOutgoing = false
}
case "VIDEO":
let fileUrl = dict["fileUrl"] as! String
let video = URL(string: fileUrl)!
let videoItem = JSQVideoMediaItem(fileURL: video, isReadyToPlay: true)
self.messages.append(JSQMessage(senderId: senderId, displayName: senderName, media: videoItem))
if self.senderId == senderId {
videoItem?.appliesMediaViewMaskAsOutgoing = true
} else {
videoItem?.appliesMediaViewMaskAsOutgoing = false
}
default:
print("unknown data type")
}
self.collectionView.reloadData()
}
})
}
override func didPressSend(_ button: UIButton!, withMessageText text: String!, senderId: String!, senderDisplayName: String!, date: Date!) {
let newMessage = messageRef.childByAutoId()
let messageData = ["text": text, "senderId": senderId, "senderName": senderDisplayName, "MediaType": "TEXT"]
newMessage.setValue(messageData)
self.finishSendingMessage()
}
override func didPressAccessoryButton(_ sender: UIButton!) {
print("didPressAccessoryButton")
let sheet = UIAlertController(title: "Media Messages", message: "Please 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.present(sheet, animated: true, completion: nil)
}
func getMediaFrom(_ type: CFString) {
print(type)
let mediaPicker = UIImagePickerController()
mediaPicker.delegate = self
mediaPicker.mediaTypes = [type as String]
self.present(mediaPicker, animated: true, completion: nil)
}
override func collectionView(_ collectionView: JSQMessagesCollectionView!, messageDataForItemAt indexPath: IndexPath!) -> JSQMessageData! {
return messages[indexPath.item]
}
override func collectionView(_ collectionView: JSQMessagesCollectionView!, messageBubbleImageDataForItemAt indexPath: IndexPath!) -> JSQMessageBubbleImageDataSource! {
let message = messages[indexPath.item]
let bubbleFactory = JSQMessagesBubbleImageFactory()
if message.senderId == self.senderId {
return bubbleFactory!.outgoingMessagesBubbleImage(with: .black)
} else {
return bubbleFactory!.incomingMessagesBubbleImage(with: .blue)
}
}
override func collectionView(_ collectionView: JSQMessagesCollectionView!, avatarImageDataForItemAt indexPath: IndexPath!) -> JSQMessageAvatarImageDataSource! {
let message = messages[indexPath.item]
return avatarDict[message.senderId]
//return JSQMessagesAvatarImageFactory.avatarImageWithImage(UIImage(named: "profileImage"), diameter: 30)
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print("number of item:\(messages.count)")
return messages.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = super.collectionView(collectionView, cellForItemAt: indexPath) as! JSQMessagesCollectionViewCell
return cell
}
override func collectionView(_ collectionView: JSQMessagesCollectionView!, didTapMessageBubbleAt indexPath: IndexPath!) {
print("didTapMessageBubbleAtIndexPath: \(indexPath.item)")
let message = messages[indexPath.item]
if message.isMediaMessage {
if let mediaItem = message.media as? JSQVideoMediaItem {
let player = AVPlayer(url: mediaItem.fileURL)
let playerViewController = AVPlayerViewController()
playerViewController.player = player
self.present(playerViewController, animated: true, completion: nil)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func logoutDidTapped(_ sender: AnyObject) {
do {
try FIRAuth.auth()?.signOut()
} catch let error {
print(error)
}
// Create a main storyboard instance
let storyboard = UIStoryboard(name: "Main", bundle: nil)
// From main storyboard instantiate a View controller
let LogInVC = storyboard.instantiateViewController(withIdentifier: "LogInVC") as! LogInViewController
// Get the app delegate
let appDelegate = UIApplication.shared.delegate as! AppDelegate
// Set LogIn View Controller as root view controller
appDelegate.window?.rootViewController = LogInVC
}
func sendMedia(_ picture: UIImage?, video: URL?) {
print(picture)
print(FIRStorage.storage().reference())
if let picture = picture {
let filePath = "\(FIRAuth.auth()!.currentUser)/\(Date.timeIntervalSinceReferenceDate)"
print(filePath)
let data = UIImageJPEGRepresentation(picture, 0.1)
let metadata = FIRStorageMetadata()
metadata.contentType = "image/jpg"
FIRStorage.storage().reference().child(filePath).put(data!, metadata: metadata) { (metadata, error)
in
if error != nil {
print(error?.localizedDescription)
return
}
let fileUrl = metadata!.downloadURLs![0].absoluteString
let newMessage = self.messageRef.childByAutoId()
let messageData = ["fileUrl": fileUrl, "senderId": self.senderId, "senderName": self.senderDisplayName, "MediaType": "PHOTO"]
newMessage.setValue(messageData)
}
} else if let video = video {
let filePath = "\(FIRAuth.auth()!.currentUser)/\(Date.timeIntervalSinceReferenceDate)"
print(filePath)
let data = try? Data(contentsOf: video)
let metadata = FIRStorageMetadata()
metadata.contentType = "video/mp4"
FIRStorage.storage().reference().child(filePath).put(data!, metadata: metadata) { (metadata, error)
in
if error != nil {
print(error?.localizedDescription)
return
}
let fileUrl = metadata!.downloadURLs![0].absoluteString
let newMessage = self.messageRef.childByAutoId()
let messageData = ["fileUrl": fileUrl, "senderId": self.senderId, "senderName": self.senderDisplayName, "MediaType": "VIDEO"]
newMessage.setValue(messageData)
}
}
}
}
extension ChatViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
print("did finish picking")
// get the image
print(info)
if let picture = info[UIImagePickerControllerOriginalImage] as? UIImage {
sendMedia(picture, video: nil)
}
else if let video = info[UIImagePickerControllerMediaURL] as? URL {
sendMedia(nil, video: video)
}
self.dismiss(animated: true, completion: nil)
collectionView.reloadData()
}
}
歡迎使用stackoverflow。這個問題還不清楚。 *一個小錯誤*意味着什麼?什麼錯誤?它發生了什麼?而且,這對我們來說是完全太多的代碼。代碼應該是證明問題的最低要求。您應該包含Firebase結構的片段(作爲文本),以便我們瞭解它的外觀。請查看以下兩個關於提問的指南:[我如何提出一個好問題?](https://stackoverflow.com/help/how-to-ask)和[如何創建一個最小,完整和可驗證的示例](https://stackoverflow.com/help/mcve) – Jay
謝謝你的建議。我會盡力解決這個問題。 –