//品牌输入框

[self.inputPinPaiTextField addTarget:self action:@selector(pailTextFieldChangeValue:) forControlEvents:UIControlEventEditingChanged];

pragma mark - 输入文本框的点击事件

//品牌输入框：10字限制

• (void)pailTextFieldChangeValue:(UITextField*)textField{

  UITextRange *selectedRange = [textField markedTextRange];
  //获取高亮部分
  UITextPosition *pos = [textField positionFromPosition:selectedRange.start offset:0];

  //如果在变化中是高亮部分在变，就不要计算字符了
  if (selectedRange && pos) {
  return;
  }
  NSUInteger count = textField.text.length;
  if (count > 10) {
  self.inputPinPaiTextField.text = [textField.text substringToIndex:10];
  }
  }