解决为什么有很多朋友要显示当前viewController，却无法拿到这个view的疑问

- (UIViewController *)getCurrentVC

{

    UIViewController *result = 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;

            }

        }

    }

    

    UIView *frontView = [[window subviews] objectAtIndex:0];

    

    for (UIView *subView in [window subviews]) {

        id iiii=[subView nextResponder];

 

    }

    

    id nextResponder = [frontView nextResponder];

    

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

        result = nextResponder;

    else

        result = window.rootViewController;

    

    return result;

}

//

获取到的是 self.window.rootViewController，并不是当前屏幕显示的viewController，

补充：

-(UIViewController *)getTopViewController:(UIViewController *)viewController {

    if ([viewController isKindOfClass:[UITabBarController class]]) {

        return [self getTopViewController:[(UITabBarController *)viewController selectedViewController]];

    } else if ([viewController isKindOfClass:[UINavigationController class]]) {

        return [self getTopViewController:[(UINavigationController *)viewController topViewController]];

    } else if (viewController.presentedViewController) {

        return [self getTopViewController:viewController.presentedViewController];

    } else {

        return viewController;

    }

}