同一视图中有多个UIAlertViews [英] Multiple UIAlertViews in the same view

问题描述

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

I have two UIAlertViews with ok/cancel buttons.
I catch the user response by:

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

我遇到的问题是，当前哪个警报视图处于打开状态?
在每个按钮上单击确定/取消"时，我有不同的操作要做.

The question I'm having is, which alertView is currently open?
I have different actions to do when clicking ok/cancel on each one...

推荐答案

您有几种选择:

• 使用ivars.创建警报视图时:

• Use ivars. When creating the alert view:

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

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 UIView 的 tag 属性:

#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，您可以在警报视图中添加标识符.

Subclass UIAlertView and add a userInfo property. This way you can add an identifier to your alert views.

@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.
    }
}

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