当按下UITextField / UISearchBar的清除按钮时，iPhone会执行操作 [英] iPhone perform action when UITextField / UISearchBar's clear button is pressed

问题描述

是否可以访问委托方法，以便在UITextField / UISearchBar上按下清除按钮时执行其他操作？

Is it possible to gain access to a delegate method that will allow additional actions to be performed when the "clear" button is pressed on a UITextField / UISearchBar?

谢谢

推荐答案

请参阅： UITextFieldDelegate Protocol Reference

如果将视图控制器设置为文本字段的委托（可以在界面构建器中完成），则可以使用：

If you set your view controller as the delegate for your text field (can be done in interface builder), you can use:

- (void)clearSearchTextField
{
  ...
}

- (BOOL)textFieldShouldClear:(UITextField *)textField
{
  if (textField == self.searchTextField) [self clearSearchTextField];
  return YES;
}

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