同一视图中的多个UIAlertView

Question

我有两个带有ok/cancel按钮的UIAlertViews.
我通过以下方式捕获用户响应:

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex

我遇到的问题是,哪个alertView目前正在打开？
在每个单击确定/取消时,我有不同的操作...

Answer 1

你有几个选择:

• 使用ivars.创建警报视图时:

  myFirstAlertView = [[UIAlertView alloc] initWith...];
  [myFirstAlertView show];
  // similarly for the other alert view(s).
  

  并在委托方法中:

  - (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
      if (alertView == myFirstAlertView) {
          // do something.
      } else if (alertView == mySecondAlertView) {
          // do something else.
      }
  }
  

• 使用以下tag属性UIView:

  #define kFirstAlertViewTag 1
  #define kSecondAlertViewTag 2
  

  UIAlertView *firstAlertView = [[UIAlertView alloc] initWith...];
  firstAlertView.tag = kFirstAlertViewTag;
  [firstAlertView show];
  // similarly for the other alert view(s).
  

  - (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
      switch (alertView.tag) {
          case kFirstAlertViewTag:
              // do something;
              break;
          case kSecondAlertViewTag:
              // do something else
              break;
      }
  }
  

• 子类UIAlertView并添加userInfo属性.这样,您可以为警报视图添加标识符.

  @interface MyAlertView : UIAlertView
  @property (nonatomic) id userInfo;
  @end
  

  myFirstAlertView = [[MyAlertView alloc] initWith...];
  myFirstAlertView.userInfo = firstUserInfo;
  [myFirstAlertView show];
  // similarly for the other alert view(s).
  

  - (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
      if (alertView.userInfo == firstUserInfo) {
          // do something.
      } else if (alertView.userInfo == secondUserInfo) {
          // do something else.
      }
  }