iphone - NSInternalInconsistencyException 找不到实体名称的 NSManagedObjectModel

Question

我正在尝试在我已经开始的项目中设置核心数据。我已经解决了一些其他错误，但现在已将范围缩小到这个，

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'Manuf''

我想我已经缩小了问题的范围，并找到了这个问答的可能解决方案 here回复:亚历克斯的回答。

但是我不完全确定这对我来说是这种情况，因为我感到困惑的原因是我没有在我的应用程序委托(delegate)和 View Controller 中设置所有内容，而是实际上使用我的应用程序委托(delegate)和对象类。所以我希望有人可以帮助我在这里隔离并解决我的问题......

这是我的对象类中的代码段，它给我带来了问题。它几乎与 xcode 为 coredata 应用程序生成的模板代码相同，但是它排除了排序和 tableview 的东西，因为我不需要那些。我只是将一堆 NSData 转储到我的 coredata 对象中。

- (NSFetchedResultsController *)fetchedResultsController
{
    if (__fetchedResultsController != nil) {
        return __fetchedResultsController;
    }

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    // Edit the entity name as appropriate.
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Manuf" inManagedObjectContext:self.managedObjectContext]; //this is the line where my code fails and generates the error in the log
    [fetchRequest setEntity:entity];

    // Edit the section name key path and cache name if appropriate.
    // nil for section name key path means "no sections".
    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:@"Master"];
    aFetchedResultsController.delegate = self;
    self.fetchedResultsController = aFetchedResultsController;

    NSError *error = nil;
    if (![self.fetchedResultsController performFetch:&error]) {
        // Replace this implementation with code to handle the error appropriately.
        // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. 
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }

    return __fetchedResultsController;
} 

更新:

这是我认为我出错的地方。在模板代码中， Controller 和上下文是这样在 appdelegate 中设置的

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController;
    ICDMasterViewController *controller = (ICDMasterViewController *)navigationController.topViewController;
    controller.managedObjectContext = self.managedObjectContext;
    return YES;
}

因为我在一个对象类中做我所有的事情，所以我不确定如何在我的应用委托(delegate)中初始化它？

与我现在在我的 appdelegate 中尝试做的相反

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{   
    //Add status bar
    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackOpaque];
    [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];

    self.window.rootViewController = self.navigationController; //Adds RootViewController to the NavigationController interface
    self.navigationController.navigationBar.tintColor = [UIColor grayColor];
    [self.window makeKeyAndVisible];

    //try setting up context for my nsobjectclass EngineResponses
    EngineResponses *engineResponses = [[EngineResponses alloc] init];
    engineResponses.managedObjectContext = self.managedObjectContext;

    return YES;
}

Answer 1

早上好。

我会检查三件事:

1) 是 self.managedObjectContext nil 吗？ (如果你 NSLog(@"%@", self.managedObjectContext); 会得到什么？

2) 您的模型描述是否包含名为 Manuf 的实体 - 它可能区分大小写:)

3) 创建协调器时，是否正确加载了 (2) 中的模型？