ios - 如何从 NSObject 类获取导航 Controller 并在 ios 中推送 View Controller

Question

我在一个静态库项目中工作，我想在 iOS 项目的导航 Controller 中推送一个 View Controller 我该怎么做？我是这样做的:

  UIStoryboard * storyboard = [[[UIApplication sharedApplication] keyWindow] rootViewController].storyboard;
UIViewController* pushtoVC = [storyboard instantiateViewControllerWithIdentifier:@"home"];
UINavigationController *navController = [[[[UIApplication sharedApplication] keyWindow]rootViewController] navigationController];
[navController pushViewController:pushtoVC animated:YES];

我也试过下面的代码，但它没有推送 View Controller 。

  UIStoryboard * storyboard = [[[UIApplication sharedApplication] keyWindow] rootViewController].storyboard;
UIViewController* pushtoVC = [storyboard instantiateViewControllerWithIdentifier:@"home"];
UINavigationController *navController = [[[[UIApplication sharedApplication] keyWindow]rootViewController] navigationController];
[navController pushViewController:pushtoVC animated:YES];

但是，如果我以模态方式使用当前 View Controller ，它可以正常工作，但导航 Controller 仅隐藏已加载的 View Controller 。 在没有导航 Controller 的情况下以模态方式呈现的代码如下。

 UIStoryboard * storyboard = [[[UIApplication sharedApplication] keyWindow] rootViewController].storyboard;
            if ([[storyboard valueForKey:@"identifierToNibNameMap"] objectForKey:@"home"]) {
                // the view controller exists, instantiate it here
                UIViewController* myVC = [storyboard instantiateViewControllerWithIdentifier:@"home"];
                myVC.modalPresentationStyle = UIModalPresentationFullScreen;
                [[[[UIApplication sharedApplication]keyWindow] rootViewController] presentViewController:myVC animated:YES completion:nil];

上面的代码以模态方式呈现 View Controller ，但从 View Controller 中删除了导航 Controller ，但我想使用导航 Controller 导航到主视图 Controller 。

Answer 1

目前还不完全清楚您要尝试做什么，因此可以说您应该传递一个 Controller 用于演示，或者将 Controller 传回给知道如何展示它的其他人...

无论如何，我猜你的根 VC 是一个导航 Controller ，所以你应该直接使用它而不是向它询问它的导航 Controller (它是 nil)。

UINavigationController *navController = (UINavigationController *)[[[UIApplication sharedApplication] keyWindow] rootViewController];
[navController pushViewController:pushtoVC animated:YES];