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how can i refresh the view so that this change is shown, with out exiting the view.
You shouldn't have to exit the view. Such a change should be almost immediate, assuming you're not blocking the main run loop. Perhaps there is an issue with your update code. Let's see it.
 
If you don't see a change in the textfields, do some basic debugging.

1. NSLog the button-index received by alertView:clickedButtonAtIndex:.

2. Confirm that button-index 0 is the correct value for clearing the fields, and isn't the button-index for Cancel.

Instead of assuming your code works, assume it doesn't work. Then add statements like NSLog() or assertions that can show you whether it's doing what it should.
 
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