尝试设置 PFUser 的个人资料图片时出现致命错误

Question

我试图设置注册页面，以便用户可以设置个人资料图片，但是当我按下注册按钮并且它跳转到注册页面时，由于个人资料图片，它一直崩溃代码。这是设置头像的按钮

    @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)
}

这是在 viewDidLoad() 方法

中发送要解析的数据的代码

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

不断崩溃的行是 let profilePicture.... 行给出错误： 致命错误：在展开可选值时意外发现 nil (lldb)

Answer 1

解包时profilePictureIV?.image为nil时出现错误，检查

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
}