Ios 尝试在使用Parse注册期间将picture设置为必填字段

我对编码还是新手。我已经设置了注册屏幕，但我想强制在注册期间上传个人资料图片。我曾尝试添加和“if语句”以在照片未上传时显示警报，但我没有成功使其正常工作。有什么建议吗？这是我的密码：

class SignUpViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

@IBOutlet var usernameField: UITextField!

@IBOutlet var activityIndicator: UIActivityIndicatorView!
@IBOutlet var message: UILabel!
@IBOutlet var emailField: UITextField!
@IBOutlet var passwordField: UITextField!
@IBOutlet var firstNameField: UITextField!
@IBOutlet var lastNameField: UITextField!

@IBOutlet var profilePic: UIImageView!




@IBAction func submitDataAction(sender: AnyObject) {


    var userName = usernameField.text
    var userEmail = emailField.text
    var userPassword = passwordField.text
    var firstName = firstNameField.text
    var lastName = lastNameField.text
    var initialImage = UIImage(named: "DidNotLoad")
    var picfile = profilePic.image
    let imageData = UIImagePNGRepresentation(picfile)
    let imageFile = PFFile(data: imageData)







    userEmail = userEmail.lowercaseString

    // Start activity indicator
    activityIndicator.hidden = false
    activityIndicator.startAnimating()

    var newUser = PFUser()
    newUser.username = userName.lowercaseString
    newUser.password = userPassword
    newUser.email = userEmail
    newUser["FirstName"] = firstName
    newUser["LastName"] = lastName
    newUser["ProfilePic"] = imageFile



    newUser.signUpInBackgroundWithBlock {(succeeded: Bool, error: NSError?) -> Void in
        if error == nil {
            dispatch_async(dispatch_get_main_queue()) {
                self.performSegueWithIdentifier("PushToEventsTableFromSignUp", sender: self)
            }

            self.activityIndicator.stopAnimating()
        }
        else {
            if let message: AnyObject = error!.userInfo!["error"] {
                self.message.text = "\(message)"

            }
        }
    }
}

@IBAction func uploadPhoto(sender: AnyObject) {
    //Create variable for image controller
    var picPhoto = UIImagePickerController()
    picPhoto.delegate = self
    picPhoto.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
    picPhoto.allowsEditing = true
    self.presentViewController(picPhoto, animated: true, completion: nil)

}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {

   self.dismissViewControllerAnimated(true, completion: { () -> Void in

    })

    profilePic.image = image
}


override func viewDidLoad() {
    super.viewDidLoad()
    self.makingRoundedImageProfileWithRoundedBorder()
    activityIndicator.hidden = true
    activityIndicator.hidesWhenStopped = true


    // Do any additional setup after loading the view.
}


private func makingRoundedImageProfileWithRoundedBorder() {
    self.profilePic.layer.cornerRadius = self.profilePic.bounds.size.width/2;
    self.profilePic.layer.masksToBounds = true
   // self.profilePic.clipsToBounds = true

    //Create Border around profile Pic
    self.profilePic.layer.borderWidth = 2.0
    self.profilePic.layer.borderColor = UIColor.whiteColor().CGColor
}

---

在开始真正的解析注册之前，您可以检查用户是否选择了图像。例如，在您的

didFinishPickingImage

方法中，您可以将bool设置为true：

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {

   self.dismissViewControllerAnimated(true, completion: { () -> Void in

    })

    profilePic.image = image
    pictureChosen = true
}

之后，如果布尔值为真，请签入

submitdata动作

：

if pictureChosen{
    //Submit the signup
}

---

还有什么我需要为pictureChosen方法定义的，因为我得到的错误是"当我尝试添加“if pictureChosen”方法时，使用未解析标识符“pictureChosen”。是的，您需要在这样的方法之外的某个地方声明变量：

var pictureChosen=false

输入变量时没有错误，但当我在模拟器中测试它时，当我尝试在没有照片选择“致命错误：在展开可选值（lldb）时意外发现零”