objective-c - 同一 View 中有多个UIAlertViews

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:

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

我的问题是，哪个alertView当前处于打开状态？
在每个按钮上单击“确定/取消”时，我需要执行不同的操作...

最佳答案

您有几种选择:

使用ivars。创建警报 View 时:

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

并在委托(delegate)方法中:

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

使用tag的UIView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，您可以向警报 View 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.
    }
}

关于objective-c - 同一 View 中有多个UIAlertViews，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/12731460/