특정 데이터를 추가하는 대신 전체 핵심 데이터 개체 다시로드

저는 iOS를 처음 접했습니다. 저는 Core Data를 완전히 처음 사용합니다. 저는 교수님의 전 대학원생들로부터 프로젝트의 코드베이스를 인수하고 있습니다.

내 앱이 데이터베이스에서 이미지를 가져올 때 img의 경로는 다음과 같습니다.

/Users/matt/Library/Developer/CoreSimulator/Devices/DA58E774-84BE-48F6-B50F-5921F682E87B/data/Containers/Bundle/Application/DA30DEFB-D90B-4D52-8462-3F8A5F4C55ED/Leaflet-US.app/thumbnail/species/Abies fraseri/images/LTV-BAM-2848_crop.jpg

CoreSimulator/Devices이 경로에 포함되어 있기 때문에 앱의 Core Data에서 이미지를 찾는다고 가정합니다. 제가 실수 할 수 있으니 제가 틀렸다면 정정 해주세요.

또한 내 앱의 리소스 파일에 썸네일 버전이 있는데, 여기에는 Abies fraseri디렉토리 가 포함되어 있습니다 .

Right now, the Core Data does not have the Abies fraseri directory. I know this because in terminal I can cd into /Users/matt/Library/Developer/CoreSimulator/Devices/DA58E774-84BE-48F6-B50F-5921F682E87B/data/Containers/Bundle/Application/DA30DEFB-D90B-4D52-8462-3F8A5F4C55ED/Leaflet-US.app/thumbnail/species/ and verify that Abies fraseri does not exist. I would like to update the core data's version of thumbnail/species so that it has it.

From what I've seen in these posts, you update an object of core data by adding specific key/value pair to the array that results from a fetch.

Example:

NSManagedObject *entityNameObj = [NSEntityDescription insertNewObjectForEntityForName:@"EntityName" inManagedObjectContext:context];
[entityNameObj setValue:@"someValue" forKey:@"someKey"];

However, is there a way to delete and re-enter thumbnail, rather than have to go through and specify each new key value pairs? I ask because I updated the local db, thumbnail, with 200 new species, each of which is a directory with several images.

The fetch request, if it applies:

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSManagedObjectContext* context = [(LeafletAppDelegate*)[[UIApplication sharedApplication] delegate] managedObjectContext];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Species" inManagedObjectContext:context] ;
    [fetchRequest setEntity:entity];


    if (predicate)
    {
        [fetchRequest setPredicate:predicate];
    }

    [fetchRequest setSortDescriptors:sortDescriptors];

    // Create and initialize the fetch results controller.
    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:context sectionNameKeyPath:sectionNameKeyPath cacheName:nil];

    self.fetchedResultsController = aFetchedResultsController;
    fetchedResultsController.delegate = self;

    // Memory management.
    [aFetchedResultsController release];
    [fetchRequest release];

    return fetchedResultsController;