Firebase Storageから写真をダウンロードし、現在のユーザの最後のものを交換する方法

Question

Firebaseから写真のユーザアカウントをダウンロードしようとしています。 私の問題について説明します： ユーザーのプロフィールページには、自分のプロフィールアバターの現在の画像を表示するボタンがあります。ボタンの背景には画像がありません。最初にクリックすると写真の画像を選択できますライブラリーを作成したり、デバイスカメラ（アラートコントローラー）で写真を撮ると、この画像または写真がFirebase Storageにアップロードされ、新しい写真がボタンの背景に表示されます。

しかし、ユーザーが現在の写真を変更したいときは、もう一度ボタンをタップして写真を撮るか、写真を撮っても、ボタンの背景は変わらない。現在のページの写真では変更は更新されませんが、別のビューに戻って写真の変更ビューに戻ると、ボタンの背景に選択したユーザーの正しい写真が表示されます。したがって、ダウンロードはうまくいくが、ユーザーが別の見方をしなかった場合はすぐにはうまくいかない。説明するのは少し難しい。ここで

は私のアップロードの方法のための私のコードです：ダウンロードした後

// Variables I need 
@IBOutlet weak var photoProfil: UIButton! 
var name: String! 
var userUid: String! 
@IBOutlet var userImagePicker: UIImageView! 
var imagePicker: UIImagePickerController! 
var imageSelected = false 
var isUploaded: Bool = false 
var refDatabase: DatabaseReference! 
var photovide: UIImage = UIImage(named:"profilvide")! 

// Take a photo with the camera (first choice) 
func takePhoto(_ sender: Any) { 
    if UIImagePickerController.isSourceTypeAvailable(.camera) { 
     imagePicker.delegate = self 
     imagePicker.allowsEditing = false 
     imagePicker.sourceType = UIImagePickerControllerSourceType.camera // Source Camera 
     self.present(imagePicker, animated: false, completion: nil) 
    } else { // If camera doesn't work 
     imagePicker.delegate = self 
     imagePicker.allowsEditing = false 

     imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary // Source Library 
     self.present(imagePicker, animated: false, completion: nil) 
    } 
} 

// Choose an image from the library 
func libraryPhoto(sender: AnyObject) { 
    let image = UIImagePickerController() 
    image.delegate = self 
    image.sourceType = UIImagePickerControllerSourceType.photoLibrary 
    image.allowsEditing = false 
    self.present(image, animated: true) 
} 

// Take this image and shows it on the View Controller 
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: Any]) { 
    // I want to upload the photo to storage and save it in the database 
    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage { 
     photoProfil.setImage(image, for: .normal) // Button showing the user photo 
     userImagePicker.image = image 
     imageSelected = true 
     uploadImg() 
    } else { 
     print("Error...") 
    } 

    imagePicker.dismiss(animated: true, completion: nil) 
    self.dismiss(animated: true, completion: nil) 
} 

// The alert Controller 
@IBAction func actionButton(_ sender: Any) { 
    let attributedString = NSAttributedString(string: "User photo", attributes: [ 
     NSFontAttributeName : UIFont.boldSystemFont(ofSize: 15), 
     NSForegroundColorAttributeName : UIColor.black 
     ]) 

    let alertController = UIAlertController(title: "", message: "", preferredStyle: .actionSheet) 
    alertController.message = nil 
    alertController.setValue(attributedString, forKey: "attributedTitle") 
    alertController.addAction(UIAlertAction(title: "Take photo", style: .default, handler: self.takePhoto)) 
    alertController.addAction(UIAlertAction(title: "Choose in Library", style: .default, handler: self.libraryPhoto)) 
    alertController.addAction(UIAlertAction(title: "Show current photo", style: .default, handler: self.showPhoto)) 
    alertController.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil)) 
    self.present(alertController, animated: true, completion: nil) 
} 

// Create a path in order to save the photo in Firebase 
func setUser(img: String) { 
    var userUid = Auth.auth().currentUser?.uid 
    let userData = [ 
        "nickname": Auth.auth().currentUser?.displayName, 
        "userImg": img 
        ] 

    KeychainWrapper.standard.set(userUid!, forKey: "uid") 
    let location =                                                                                                                                                                                                                          Database.database().reference().child("users").child(userUid!).child("pseudo") 
    location.setValue(userData) 
    dismiss(animated: true, completion: nil) 
} 

// Upload and put image in the Firebase Storage 
func uploadImg() { 
    guard let img = userImagePicker.image, imageSelected == true else { 
     print("Image needs to be selected") 
     return 
    } 

    if let imgData = UIImageJPEGRepresentation(img, 0.2) { 
     let imgUid = NSUUID().uuidString 
     let metadata = StorageMetadata() 
     metadata.contentType = "image/jpeg" 

     Storage.storage().reference().child(imgUid).putData(imgData, metadata: metadata) { (metadata, error) in 
      if error != nil { 
       print("Did not upload img") 
       self.isUploaded = false 
      } else { 
       print("uploaded") 
       self.isUploaded = true 
       let downloadURL = metadata?.downloadURL()?.absoluteString 
       if let url = downloadURL { 
        self.setUser(img: url) 
       } 
      } 
     } 
    } 
} 

はここでダウンロード方法およびshow写真のためのコードです：

override func viewDidLoad() { 
    super.viewDidLoad() 
    imagePicker = UIImagePickerController() 
    imagePicker.delegate = self 
    imagePicker.allowsEditing = true 

    // For download photo from Firebase 
    name = Auth.auth().currentUser?.displayName 
    userUid = Auth.auth().currentUser?.uid 

    refDatabase = Database.database().reference().child("users").child(userUid!) 
    refDatabase.child("pseudo").observeSingleEvent(of: .value, with: { (snapshot) in 

     if snapshot.hasChild("userImg") { 
      self.isUploaded = true 
      print("True userImg exists") 
      self.downloadPhoto(user: self.name) 
     } else { 
      self.isUploaded = false 
      self.userImagePicker = UIImageView(image: self.photovide) 
      self.photoProfil.setImage(self.photovide, for: .normal) 
      print("isUploaded2 = false") 
      print("false userImg doesn't exist") 
      print("Aucune photo n'a été uploadée dans la base de données") 
     } 
    }) 
} 

override func viewWillAppear(_ animated: Bool) { 
    self.userImagePicker.image = nil 
    guard let username = Auth.auth().currentUser?.displayName else { return } 
    self.navigationItem.title = username 

    refDatabase = Database.database().reference().child("users").child(userUid!) 

    refDatabase.child("pseudo").observeSingleEvent(of: .value, with: { (snapshot) in 

     if snapshot.hasChild("userImg") { 
      self.isUploaded = true 
      print("isUploaded2 = true") 
      print("true userImg exists") 
      self.downloadPhoto(user: self.name) 
     } else { 
      self.isUploaded = false 
      self.userImagePicker = UIImageView(image: self.photovide) 
      self.photoProfil.setImage(self.photovide, for: .normal) 
      print("False userImg doesn't exist") 
     } 
    }) 
} 

func downloadPhoto(user: String) { 
    self.name = user 
    let recipientData = Database.database().reference().child("users").child(userUid!).child("pseudo") 

    recipientData.observeSingleEvent(of: .value, with: { (snapshot) in 
     let data = snapshot.value as! Dictionary<String, AnyObject> 
     let nickname = data["nickname"] 
     let userImg = data["userImg"] 

     let ref = Storage.storage().reference(forURL: userImg! as! String) 
     ref.getData(maxSize: 1000000, completion: { (data, error) in 
      if error != nil { 
       print("Could not load image") 
      } else { 
       if let imgData = data { 
        if let img = UIImage(data: imgData) { 
         self.userImagePicker.image = img 
         self.photoProfil.setImage(img, for: .normal) 
        } 
       } 
      } 
     }) 
    }) 
    userImagePicker.reloadInputViews() 
} 

func dismissFullscreenImage(_ sender: UITapGestureRecognizer) { 
    self.navigationController?.isNavigationBarHidden = false 
    self.tabBarController?.tabBar.isHidden = false 
    sender.view?.removeFromSuperview() 
} 

// Try to do the same with the viewDidLoad() method for download but can't work 
override func viewDidAppear(_ animated: Bool) { 
    refDatabase = Database.database().reference().child("users").child(userUid!) 

    refDatabase.child("pseudo").observeSingleEvent(of: .value, with: { (snapshot) in 

     if snapshot.hasChild("userImg") { 
      self.isUploaded = true 
      print("True userImg exists") 
      self.downloadPhoto(user: self.name) 
     } else { 
      self.isUploaded = false 
      self.userImagePicker = UIImageView(image: self.photovide) 
      self.photoProfil.setImage(self.photovide, for: .normal) 
      print("False userImg doesn't exist") 
     } 
    }) 
} 

Answer 1

あなたがでdownloadPhoto（）メソッドを呼び出すようにしてくださいuploadImg（）メソッドあなたも、あなたがのviewDidLoad（に使用したコードの一部で関数を作ることができ

func uploadImg() { 
    name = Auth.auth().currentUser?.displayName 
    userUid = Auth.auth().currentUser?.uid 

    guard let img = userImagePicker.image, imageSelected == true else { 
     print("Image needs to be selected") 
     return 
    } 

    if let imgData = UIImageJPEGRepresentation(img, 0.2) { 
     let imgUid = NSUUID().uuidString 
     let metadata = StorageMetadata() 
     metadata.contentType = "image/jpeg" 

     Storage.storage().reference().child(imgUid).putData(imgData, metadata: metadata) { (metadata, error) in 
      if error != nil { 
       print("Did not upload img") 
       self.isUploaded = false 
      } else { 
       print("Uploaded") 
       self.isUploaded = true 
       let downloadURL = metadata?.downloadURL()?.absoluteString 
       if let url = downloadURL { 
        self.setUser(img: url) 
        self.downloadPhoto(user: self.name) // Here add it 
       } 
      } 
     } 
    } 
} 

）とviewWillAppearで（）と適切なコードのために、この2つの方法でこの関数を呼び出します。このよう

。 お手伝いをしてください。