Restrict user from entering certain number of characters in UITextField

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { // Restrict user in entering 25 characters in UITextField

          

    if (textField.tag==111) {

        

        const char * _char = [string cStringUsingEncoding:NSUTF8StringEncoding];

        int isBackSpace = strcmp(_char, "\b");

        

        if (isBackSpace == -8) {

            NSLog(@"isBackSpace");

            return YES; // is backspace

        }

        else if (textField.text.length <= 25 && range.length == 0) {

            return YES;

        }

    }

           

    return NO;

}