Question

我正在使用带有初始介绍视图控制器的故事板，我希望将其转换为具有核心数据的表视图控制器。我知道初始控制器是根控制器，但由于连接到核心数据，我需要第二个控制器作为根。当我在我的app委托中执行以下操作时，出现此错误：

-[IntroViewController setViewControllers:]: unrecognized selector sent to instance 0x7465b70
2013-01-21 22:29:15.331 PManager[35522:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[IntroViewController setViewControllers:]: unrecognized selector sent to instance 0x7465b70'

我的第一个视图在故事板中被称为“introController”。

我的第二个视图是一个连接到故事板中名为“listController”的核心数据的表视图。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)options
{

    // Get a reference to the navigation controller first
    UINavigationController *navigationController = (UINavigationController *) self.window.rootViewController;

    IntroViewController *introController = [navigationController.storyboard instantiateViewControllerWithIdentifier:@"introController"];
    RootViewController *listController = [navigationController.storyboard instantiateViewControllerWithIdentifier:@"listController"];

    // First item in array is bottom of stack, last item is top.
    navigationController.viewControllers = [NSArray arrayWithObjects:listController, introController, nil];

    // THEN get the root view controller (RootViewController)
    RootViewController *rootViewController = (RootViewController *)[[navigationController viewControllers] objectAtIndex:0];

    // And now pass the context
    rootViewController.managedObjectContext = managedObjectContext;

    [self.window makeKeyAndVisible];

    return YES;
}

Answer 1

改变应用的组织方式可能会更好。而不是依靠应用程序委托类来管理managedObjectContext，而是创建另一个类，作为单例全局管理对托管对象上下文的访问。直接从表视图控制器类和任何其他类引用该类。这样的事情：Most efficient way of passing data between views

iOS Storyboard介绍视图后跟带有核心数据的表视图

1 个答案: