UIAlertView可以轻松判断是否选择了取消按钮

Question

我知道我以前做过这件事,但我再说不出来了.

我用什么方法来查看是否按下了取消按钮.我不想根据按钮索引来做.有一种方法可以做到这一点,例如:

[alertView isCancelIndex:index];

谁知道？

Answer 1

UIAlertView具有取消按钮索引的属性

@property(nonatomic) NSInteger cancelButtonIndex

用法

[alertView cancelButtonIndex]

Answer 2

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

  if (buttonIndex == [alertView cancelButtonIndex]) {
    NSLog(@"The cancel button was clicked for alertView");
  }
// else do your stuff for the rest of the buttons (firstOtherButtonIndex, secondOtherButtonIndex, etc)
}