ios - 找不到实体名称的 NSManagedObjectModel

Question

我得到错误:

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

但不久前还有效!现在，我在 didFinishLaunchingWithOptions 终止之前收到错误。

我的代码是:

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

    // Override point for customization after application launch.
    NSLog(@"DID finish launching %@", [self managedObjectContext]);

    PlaylistsViewController *table = [[PlaylistsViewController alloc] init];

    NSManagedObjectContext *context = [self managedObjectContext];

    if (!context) {
        NSLog(@"\nCould not create *context for self");
    }

    table.context = context;

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

    return YES;
}

编辑:

-(void) getData {
context = [(ClientAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext]; 
NSEntityDescription *entity = [NSEntityDescription entityForName:@"CorePlaylist" inManagedObjectContext:context];
NSFetchRequest *request = [[NSFetchRequest alloc] init];

[request setFetchBatchSize:20];
[request setEntity:entity];

NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:@"playlistid" ascending:YES];

NSArray *newArray = [NSArray arrayWithObject:sort];

[request setSortDescriptors:newArray];

NSError *error;

NSMutableArray *results = [[context executeFetchRequest:request error:&error] mutableCopy];

[self setArr:results];

[self.tableView reloadData];
}

Answer 1

确保您的 coreDataModel 文件位于项目中，并且您调用的实体拼写正确(区分大小写)。

如果您正在设备上进行测试，您可能需要完全删除应用程序才能再次部署它，以防止出现数据库损坏问题。