使用 SWRevealViewController 时获取顶部 UIViewController

Question

我的项目使用SWRevealViewController 和标签栏控制器。我使用下面的代码来获取可见的视图控制器：

- (UIViewController*) topMostController
{
    return [self topViewControllerWithRootViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
}

- (UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController {
    if ([rootViewController isKindOfClass:[UITabBarController class]]) {
        UITabBarController* tabBarController = (UITabBarController*)rootViewController;
        return [self topViewControllerWithRootViewController:tabBarController.selectedViewController];
    } else if ([rootViewController isKindOfClass:[UINavigationController class]]) {
        UINavigationController* navigationController = (UINavigationController*)rootViewController;
        return [self topViewControllerWithRootViewController:navigationController.visibleViewController];
    } else if (rootViewController.presentedViewController) {
        UIViewController* presentedViewController = rootViewController.presentedViewController;
        return [self topViewControllerWithRootViewController:presentedViewController];
    } else {
        return rootViewController;
    }
}

但是当我站在MessageViewController 或其他任何位置时，我总是以SWRevealViewController 为顶部。请纠正我在这种情况下获取可见视图控制器的正确方法。

Answer 1

• 在使用带有标签栏的 SWRevealController 时检查层次结构并进行相应的导航。

它的 SWRevealController->tabbarcontroller->navigationcontroller->导航控制器中的lastobject。如果不同，相应调整。例如，提供了具有此层次结构的代码。

(UIViewController*) visibleViewControllerWhenUsingSWRevealController  {

    if ([swRevealController.frontViewController isKindOfClass:[UITabBarController class]]) {

        UITabBarController *tabBarController = (UITabBarController *)mainRevealController.frontViewController;

        if ([tabBarController.selectedViewController isKindOfClass:[UINavigationController class]]) {
             UINavigationController *navigationController = tabBarController.selectedViewController;
             return ( [[navigationController viewControllers] lastObject]) ;
        }
    }  

    return nil;
}

Answer 2

希望这将有助于找出SWRevealViewController的frontViewController

- (UIViewController*)topViewController {
    UIViewController *view= [self topViewControllerWithRootViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
    return view;
}


- (UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController {
    if ([rootViewController isKindOfClass:[UITabBarController class]]) {
        UITabBarController* tabBarController = (UITabBarController*)rootViewController;
        return [self topViewControllerWithRootViewController:tabBarController.selectedViewController];
    } else if ([rootViewController isKindOfClass:[UINavigationController class]]) {
        UINavigationController* navigationController = (UINavigationController*)rootViewController;
        return [self topViewControllerWithRootViewController:navigationController.visibleViewController];
    }else if ([rootViewController isKindOfClass:[SWRevealViewController class]]) {
        SWRevealViewController* viewcontroller = (SWRevealViewController*)rootViewController;
        return [self topViewControllerWithRootViewController:viewcontroller.frontViewController];
    }

    else if (rootViewController.presentedViewController) {
        UIViewController* presentedViewController = rootViewController.presentedViewController;
        return [self topViewControllerWithRootViewController:presentedViewController];
    } else {
        return rootViewController;
    }
}

Answer 3

我知道回答这个问题已经很晚了，但也许这会对某人有所帮助，因为我最近无法找到解决方案。我的答案是针对 swift 用户：

extension UIApplication {
class func topViewController() -> UIViewController? {
    var topVC = shared.keyWindow!.rootViewController
    while true {
        if let presented = topVC?.presentedViewController {
            topVC = presented
        } else if let nav = topVC as? UINavigationController {
            topVC = nav.visibleViewController
        } else if let tab = topVC as? UITabBarController {
            topVC = tab.selectedViewController
        }else if let swRVC = topVC as? SWRevealViewController {
            topVC = swRVC.frontViewController
        } else {
            break
        }
    }
    return topVC
}
}