应用程序窗口应在应用程序启动结束时具有根视图控制器 - 即使修复了所有已知问题 [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互联网上找不到的任何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.

似乎是两个可能出现此错误的地方：

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 AppDelegate 类的 NSString 值。因此工作正常。

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

2.AppDelegate.m - 设置根视图控制器有一种较旧的方式，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，在我的应用程序中，它已更新为：

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。更令人费解的是，我的同事可以让它在他的计算机上完美地工作 - 他是那个向我发送应用程序源代码的人，因此所有的设置和代码都应该完全相同。

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.

我试图在模拟器中启动它。它是针对iOS 5构建的，但我试图在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).

有什么理由会发生这种情况吗？我该如何纠正呢？

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

非常感谢

Tom

推荐答案

我试图将UITableView添加到单视图应用程序时遇到了同样的问题。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;
}

您不需要直接将视图控制器设置为窗口的rootViewController，而是需要创建导航控制器使用您的视图控制器初始化initWithRootViewController，然后将该导航控制器设置为窗口的rootViewController。 （请注意，您还必须将属性中的导航控制器松开，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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