获取iOS应用中当前处于Activity状态的ViewController

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转自：http://blog.csdn.net/lixuwen521/article/details/41447507

// 获取当前处于activity状态的view controller

- (UIViewController *)activityViewController

{

    UIViewController* activityViewController = nil;

    UIWindow *window = [[UIApplication sharedApplication] keyWindow];

    if(window.windowLevel != UIWindowLevelNormal)

    {

        NSArray *windows = [[UIApplication sharedApplication] windows];

        for(UIWindow *tmpWin in windows)

        {

            if(tmpWin.windowLevel == UIWindowLevelNormal)

            {

                window = tmpWin;

                break;

            }

        }

    }

    NSArray *viewsArray = [window subviews];

    if([viewsArray count] > )

    {

        UIView *frontView = [viewsArray objectAtIndex:];

        id nextResponder = [frontView nextResponder];

        if([nextResponder isKindOfClass:[UIViewController class]])

        {

            activityViewController = nextResponder;

        }

        else

        {

            activityViewController = window.rootViewController;

        }

    }

    return activityViewController;

}