iOS开发中苹果输入手机号变用户的名字

#pragma mark - UITextFieldDelegate
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
  if (textField == _txtUserName) {
    // 12312345678-> 123 1234 5678
    if (range.location == 3 || range.location == 8) {
      
      textField.text = [textField.text stringByAppendingString:@" "];
    }
    // 手机号最多输13位 包含两个空格,防止文本替换
    if(range.location >= 13){
      return NO;
    }
  }
  return YES;
}

#pragma mark - UITextFieldDelegate
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
  if (textField == _txtUserName) {
    // 删除
    if (_lastLocation > range.location) {
      if (range.location == 9 || range.location == 4) {
        // 删除到空格后一位的时候，自动把空格也去掉
        textField.text = [textField.text substringToIndex:range.location];
      }
      _lastLocation = range.location - 1;
      return YES;
    }else {
      // 输入
      if (range.location == 3 || range.location == 8) {
        textField.text = [textField.text stringByAppendingString:@" "];
      }
    }
    _lastLocation = range.location;
    // 手机号最多输13位 包含两个空格,防止文本替换
    if(range.location >= 13){
      return NO;
    }
  }
  return YES;
}