应用程序窗口应该在应用程序启动结束时有一个根视图控制器 - 即使所有已知问题都已修复 [英] Application windows are expected to have a root view controller at the end of application launch - even with all known issues fixed

问题描述

我有这个问题，但是我在这个论坛或一般互联网上找不到的信息似乎都无法帮助我.

I have this problem, however none of the information I can find on this forum or the internet in general seems to be able to help me.

似乎有两个地方会出现此错误:

There seem to be two places where this error can come about:

1. main.m - 我的函数如下所示:

  int main(int argc, char *argv[])
    {
        @autoreleasepool {
            return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
        }
    }

UIApplicationMain 中的最后一个参数返回我的 AppDelegate 类的 NSString 值.因此，这工作正常.

The last argument in UIApplicationMain returns an NSString value of the class of my AppDelegate. This is therefore working fine.

2.AppDelegate.m - 有一种旧"的方式来设置根视图控制器，如下所示:

2.AppDelegate.m - there is an "older" way of setting the root view controller which is like this:

  [self.window addSubview:rootViewController];

但是，在我的应用中，它已经更新为:

However, in my app it has already been updated to:

self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];

因此，互联网上的当前信息均无效.这有点令人费解，因为我的同事可以让它在他的计算机上完美运行 - 他是向我发送应用程序源代码的人，因此所有设置和代码应该完全相同.

So none of the current information on the internet works. It is slightly more puzzling as my colleague can get it to work on his computer perfectly fine - he was the one that sent me the app source code so all the settings and code should be exactly the same.

我正在尝试在模拟器中启动它.它是针对 iOS 5 构建的，但我正在尝试在 iOS 6.0 模拟器上运行它.

I am trying to launch this in the simulator. It is built against iOS 5, but I'm trying to run it on the iOS 6.0 simulator.

我有最新的 XCode (4.5.1).

I have the latest XCode (4.5.1).

有什么原因会发生这种情况吗?我该如何纠正它?

Is there any reason this would be happening? And how can I rectify it?

非常感谢

汤姆

推荐答案

我在尝试将 UITableView 添加到单视图应用程序时遇到了完全相同的事情.相反，创建一个默认的 Master-Detail Application 项目(file->new->target->...)并查看 AppDelegate 的 didFinishLaunchingWithOptions 实现:

I ran into exactly the same thing trying to add a UITableView to a single-view app. Instead, create a default Master-Detail Application project (file->new->target->...) and see the AppDelegate's implementation of didFinishLaunchingWithOptions:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.

MDMasterViewController *masterViewController = [[MDMasterViewController alloc] initWithNibName:@"MDMasterViewController" bundle:nil];
self.navigationController = [[UINavigationController alloc] initWithRootViewController:masterViewController];
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];
return YES;
}

与其直接将视图控制器设置为窗口的 rootViewController，不如为 initWithRootViewController 创建一个使用视图控制器初始化的导航控制器，然后将该导航控制器设置为窗口的 rootViewController.(请注意，您还必须将导航控制器隐藏在属性中，以免被破坏).

Rather than directly setting your view controller as the window's rootViewController, you need to create a navigation controller init'ed with your view controller for initWithRootViewController, then set that nav controller as the window's rootViewController. (Notice you also have to squirrel away that nav controller in a property so it doesn't get destructed).

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