“- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string”

“- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text”

if (range.location > MaxCharacterNumber - 1)
{
  textField.text = [textField.text substringToIndex:MaxCharacterNumber];
  return NO;
}

NSString *temp = [textField.text stringByReplacingCharactersInRange:range withString:string];
if (temp.length > MaxCharacterNumber)
{
  textField.text = [temp substringToIndex:MaxCharacterNumber];
  return NO;
}

“- (void)textViewDidChange:(UITextView *)textView”

NSString *textString = textView.text;
if (textString.length > MaxCharacterNumbers + 1)
{
  textView.text = [textString substringToIndex:MaxCharacterNumbers];
  return;
}

“NSString *temp = [textField.text stringByReplacingCharactersInRange:range withString:string];”