嘗試設置PFUser的個人資料圖片時發生致命錯誤

Question

我正在嘗試設置註冊頁面，以便用戶可以設置個人資料圖片，但只要按下注冊按鈕並且它會繼續註冊頁面由於配置文件圖片代碼而不斷崩潰。這是按鈕設置個人資料圖片

@IBAction func setProfilePicture(sender: AnyObject) { 
    let myPickerController = UIImagePickerController() 
    myPickerController.delegate = self 
    myPickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary 
    self.presentViewController(myPickerController, animated: true, completion: nil) 
} 

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { 

    profilePictureIV.image = info[UIImagePickerControllerOriginalImage] as? UIImage 
    self.dismissViewControllerAnimated(true, completion: nil) 
} 

，這是發送數據的viewDidLoad()方法

let newUser = PFUser() 
      let profilePicture = UIImageJPEGRepresentation((profilePictureIV?.image)!, 1) 
      if(profilePicture != nil) { 
       let profilePictureImageFile = PFFile(data: profilePicture!) 
       newUser["profilePicture"] = profilePictureImageFile 
      } 
      ... 
    } 

，保持崩潰是讓profilePicture行解析代碼... 。線給出一個錯誤： 致命錯誤：意外地發現零而展開的可選值 （LLDB）

Answer 1

當profilePictureIV?.image爲零，同時展開時發生錯誤，因此檢查它

let newUser = PFUser() 
if let profilePicture = UIImageJPEGRepresentation(profilePictureIV?.image, 1) { 
    let profilePictureImageFile = PFFile(data: profilePicture) 
    newUser["profilePicture"] = profilePictureImageFile 
} 

或

let newUser = PFUser() 
if let profilePictureImage = profilePictureIV?.image { 
    let profilePicture = UIImageJPEGRepresentation(profilePictureImage, 1)! 
    let profilePictureImageFile = PFFile(data: profilePicture) 
    newUser["profilePicture"] = profilePictureImageFile 
}