Help with Code Challenge: Signing Up new Users

Hi there,

I am attempting to answer Challenge Task 3 of 4, but it is saying my answers are wrong. I have even tested the code in my app and it works.

Note that I have also tried the following alternative comparison without success as well: [isCorrect isEqualToString:(NSString *) @"YES"]

Question and my attempted Answer is shown below. Help much appreciated.

Challenge Question:

Challenge task 3 of 4 If the guess is correct, we want to alert the user with a message using a UIAlertView. Add an if statement that checks if the BOOL variable 'isCorrect' is true (or 'YES'). Inside the if statement, declare a new UIAlertView variable named 'alertView'. Alloc/init it with the method 'initWithTitle:message:delegate:cancelButtonTitle:otherButtonTitles'. For the title, use "Hooray!", for the message, use "You did it!", for the delegate use nil, for cancelButtonTitle use "OK", and for otherButtonTitles use nil.

My Answer:

@implementation NumberGuesserViewController

• (IBAction)makeGuess:(id)sender { NSString *userNumber;

  userNumber = self.numberField.text;

  // Check to see if the user's number is correct BOOL isCorrect = [GuessEngine testGuess:userNumber];

  if (isCorrect == true || [isCorrect isEqual:@"YES"]) { UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Hooray!" message:@"You did it!" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];

  [alertView show]; }
  }

Regards,

Luke