ios - 获取对 iOS 中顶级 View Controller 的引用

Question

如何在我的应用程序中获取对顶部可见 View Controller 的引用。我看到了一些使用navigationcontroller.[top|visible]viewcontroller 的解决方案。但我不在我的应用程序中使用导航 Controller 。

这似乎是一个非常常见的用例，我发现很难访问 top|visible View Controller 很奇怪

Answer 1

这也应该遵循您的模态视图和导航 Controller (如果有):

- (UIViewController *)deepestPresentedViewControllerOf:(UIViewController *)viewController
{
    if (viewController.presentedViewController) {
        return [self deepestPresentedViewControllerOf:viewController.presentedViewController];
    } else {
        return viewController;
    }
}

- (UIViewController *)topViewController
{
    UIViewController *rootViewController = [[[UIApplication sharedApplication] keyWindow] rootViewController];
    UIViewController *deepestPresentedViewController = [self deepestPresentedViewControllerOf:rootViewController];
    if ([deepestPresentedViewController isKindOfClass:[UINavigationController class]]) {
        return ((UINavigationController *)deepestPresentedViewController).topViewController;
    } else {
        return deepestPresentedViewController;
    }
}