Can't find fatal error: unexpectedly found nil while unwrapping an Optional value [closed] - swift

Question

Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 8 years ago.
Improve this question
It was working last night, but when I run my code, now I am receiving a:
fatal error: unexpectedly found nil while unwrapping an Optional value.
Can someone help me locate this error?
import UIKit
class UserRegistration: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate, UITextFieldDelegate {
//USER REGISTRATION FORM
//Activity Indicator
var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()
//Error
func displayAlert(title:String, error:String){
//create Alert
var alert = UIAlertController(title: title, message: error, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Ok", style: .Cancel, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
//User Profile Picture Selection
var profileImage = UIImage()
var isThereImage = false
#IBOutlet var uploadProfilePictureButton: UIButton!
#IBAction func uploadProfilePicture(sender: AnyObject) {
//Settings needed for image upload
var image = UIImagePickerController()
image.delegate = self
image.sourceType = UIImagePickerControllerSourceType.PhotoLibrary //can use '.camera' to access camera
image.allowsEditing = true
//Select image. FYI Completion is a function that happens when viewcontroller is presented
self.presentViewController(image, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController!, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
//Store image in local variable to be resized later
profileImage = image
println("Image is selected")
//Manually Close View Controller
self.dismissViewControllerAnimated(true, completion: nil)
//Remove button title
uploadProfilePictureButton.setTitle("", forState: .Normal)
//Display Image
uploadProfilePictureButton.setBackgroundImage(image, forState: .Normal)
//Set isThereImage Boolean
isThereImage = true
}
//---------------------------------------
//User Input Information
#IBOutlet var userEmailAddress: UITextField!
#IBOutlet var userPasswordOne: UITextField!
#IBOutlet var userPasswordTwo: UITextField!
#IBOutlet var passwordConfirmationMatch: UILabel!
var confirmedPassword = Bool()
//---------------------------------------
//Submit User Input to Database
#IBAction func userRegistration(sender: AnyObject) {
var error = ""
//Verify if User Exist and Passwords Match
if userEmailAddress.text == "" || userPasswordOne.text == "" || confirmedPassword == false {
error = "Please enter an email address and password, or make sure your passwords match."
println("Registration had an error")
}
if error != "" {
displayAlert("Error in Registration", error: error)
} else {
//Sign Up User
var user = PFUser()
//Resize Profile Picture
let size = CGSizeApplyAffineTransform(profileImage.size, CGAffineTransformMakeScale(0.5, 0.5))
let hasAlpha = true
let scale: CGFloat = 0.0 // Automatically use scale factor of main screen
UIGraphicsBeginImageContextWithOptions(size, !hasAlpha, scale)
profileImage.drawInRect(CGRect(origin: CGPointZero, size: size))
let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
//User Information
user.password = userPasswordTwo.text
user.email = userEmailAddress.text
user.username = userEmailAddress.text
if isThereImage == false {
displayAlert("Please upload a picture for your profile.", error: error)
}else if isThereImage == true {
var imageData = UIImagePNGRepresentation(scaledImage)
var imageFile = PFFile(name: userEmailAddress.text + ".png", data:imageData)
user.setObject(imageFile, forKey: "userProfileImage")
}
user.setObject("", forKey: "firstName")
user.setObject("", forKey: "lastName")
user.setObject("", forKey: "userLocation")
//Insert Activity Indicator here
activityIndicator = UIActivityIndicatorView(frame: CGRectMake(0, 0, 50, 50))
activityIndicator.center = self.view.center
activityIndicator.hidesWhenStopped = true
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
view.addSubview(activityIndicator)
activityIndicator.startAnimating()
UIApplication.sharedApplication().beginIgnoringInteractionEvents()
//-------------------------------
user.signUpInBackgroundWithBlock {
(succeeded: Bool!, signupError: NSError!) -> Void in
//Stop activity indicator whether there is an error or not
self.activityIndicator.stopAnimating()
UIApplication.sharedApplication().endIgnoringInteractionEvents()
if signupError == nil {
// Hooray! Let them use the app now.
println("Registration Completed")
} else {
//Keep this here!
if let errorString = signupError.userInfo?["error"] as? NSString{
error = errorString
} else {
error = "Please try again later."
}
self.displayAlert("Could not Sign Up", error: error)
println(signupError)
}
}
}
//Print Confirmation to Cortana
}
//---------------------------------------
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
passwordConfirmationMatch.hidden = true
//UITextField Delegate
self.userEmailAddress.delegate = self
self.userPasswordOne.delegate = self
self.userPasswordTwo.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//Password Matching Function
func passwordCheck() {
if userPasswordTwo.text == userPasswordOne.text {
passwordConfirmationMatch.hidden = false
confirmedPassword = true
println("Password match")
} else {
passwordConfirmationMatch.hidden = true
confirmedPassword = false
println("Passwords don't match")
}
}
//Handle Keyboard
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
self.view.endEditing(true)
passwordCheck()
}
func textFieldShouldReturn(textField: UITextField!) -> Bool {
userEmailAddress.resignFirstResponder()
userPasswordOne.resignFirstResponder()
userPasswordTwo.resignFirstResponder()
passwordCheck()
return true
}
}

Answer 1

The error you get indicates that one of your variables that has been declared as optional was nil when your code tried to access it.
Do you get any more info from the error? Like the name of the variable for example? If not, use some breakpoints to find the culprit and make sure it is not nil when the time to use it comes.