swift - 删除一个 NSManagedObject

Question

我一直在尝试删除一个 NSManagedObject。这是我的代码:

    let app = UIApplication.shared.delegate as! AppDelegate
    let context = app.persistentContainer.viewContext
    let request = NSFetchRequest<NSFetchRequestResult>(entityName: "MyEnt")
    request.predicate = NSPredicate(format: "SELF = %@", EnttoDelete.objectID)
    request.returnsObjectsAsFaults = false

    do {
        let results = try context.fetch(request)

        if results.count > 0 {

            for result in results as! [NSManagedObject] {
                print ("Ent found")                    
                context.delete(result)

                 do {
                 try context.save()
                 } catch {
                 print("failed to delete")
                 }

            }

        }


    } catch {

        print ("Error in do")
    }
}

您是否看到我删除了实体 (EnttoDelete) 及其 ID (EnttoDelete.objectID)。现在我什至在 stackoverflow 中研究过，我认为这应该可行。但事实并非如此。如何删除所需的实体？

Answer 1

我想我对此进行了排序，做了不同的事情:

    let app = UIApplication.shared.delegate as! AppDelegate
    let context = app.persistentContainer.viewContext
    var thisID: NSManagedObjectID = (thatLand?.objectID)!
    let object = context.object(with: thisID)
    context.delete(object)

    do {
        try context.save()
    } catch {
        print("failed to delete")
    }

我认为这是更好的解决方案。虽然不确定!