Question

I want to enter text into a text field and based on the text (if it says “No”) I want the alertview to pop up. I’ve created a UITextField in interface builder and attached it to the UITextField delegate in the files owner so that’s all taken care of. But when I enter text into the text field, specifically no, and click out of the textfield or remove the keyboard, no alertview pops up. I have created an entire method for this within the viewcontroller.m file. Here is the code for that method.

-(void)engageAlert {

 if (myTextField.text == @"No") {
      theAlertView = [[UIAlertView alloc] initWithTitle:@"Notice" message:@"MyMessageHere"
      delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
      [theAlertView show];
 }

}

Am I missing something here? Nothing happens when I type No into the textfield.

Answer 1

I think the culprit will be the line

myTextField.text == @"No" 

Since you’re comparing two pointers which will never match.

@”No” = 0x12341234 or whatever address for the static address of the NSString (@”” can be thought of as short hand for the compiler creating the NSString object)

What you will want is something like

if( [myTextField.text isEqualToString:@"No"])

Also check you’re not going to leak memory with theAlertView as I can’t see where you’re freeing that in the snippet.