Backspace not working when implementing shouldChangeCharactersInRange method - iPhone Dev

Question

Problem... I have a string of allowable characters "0123456789." How do I also allow the backspace from the keyboard... when I implement the code from below... the backspace key no longer works... How can I fix this?

*

  (BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSCharacterSet *nonNumberSet = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789."] invertedSet];

  return ([string stringByTrimmingCharactersInSet:nonNumberSet].length > 0);

}

Answer 1

• (BOOL) textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSCharacterSet *nonNumberSet = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789."] invertedSet];

  if (range.length == 1){ return string; }else{ return ([string stringByTrimmingCharactersInSet:nonNumberSet].length > 0); }

}