Question

I have one text field.

Below function is attached to an UI event “editing changed” from txtfield’s IB.

The function is recursive as obvious I am changing the textfield so it will call

again and again is there any thing , I can stop the function after calling it once.

So,I want to stop this looping function..

-(IBAction) testEvents:(id) sender
{ 

    txtEditAmount.text=[txtEditAmount.text substringToIndex:([txtEditAmount.text length]-1)];




}

Answer 1

Rather than using that event callback, try implementing the UITextFieldDelegate method textFieldDidEndEditing:, like so:

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    textField.text = [textField.text substringToIndex:
                      [txtEditAmount.text length] - 1];
}

So it will cut off the last character only when the user stops editing the field. Depends what you’re trying to do though, I guess. If you’re trying to backspace whatever they type, for example, a password field which stays blank but still captures the characters the user types, instead implement the protocol method textField:shouldChangeCharactersInRange:replacementString: like this:

- (BOOL)textField:(UITextField *)textField
  shouldChangeCharactersInRange:(NSRange)range
  replacementString:(NSString *)string
{
    [enteredString appendString:string]; // store the character the user typed
    return NO; // leave the field blank
}