This warning is one of the quirks we have to deal with while the details of the Swift implementation are being ironed out. The warning occurs spuriously, i.e. your setup might work even if you do not follow the steps outlined below. I have been able to get rid of it in most cases by … Read more
(Updated for Swift 3/4 now. Solutions for earlier Swift versions can be found in the edit history.) You can use unsafeDowncast to cast the return value of NSEntityDescription.insertNewObject() to Self (which is the type on which the method is actually called): extension NSManagedObject { class func create(in context: NSManagedObjectContext) -> Self { let classname = … Read more
Update for Xcode 7 (final): Prepending the module name to the class (as in Xcode 6 and early beta releases of Xcode 7) is no longer necessary. The Apple documentation Implementing Core Data Managed Object Subclasses has been updated accordingly. The Data Model inspector has now two fields “Class” and “Module” for an entity: When … Read more
You can still delete the file programmatically, using the NSFileManager:removeItemAtPath:: method. NSPersistentStore *store = …; NSError *error; NSURL *storeURL = store.URL; NSPersistentStoreCoordinator *storeCoordinator = …; [storeCoordinator removePersistentStore:store error:&error]; [[NSFileManager defaultManager] removeItemAtPath:storeURL.path error:&error]; Then, just add the persistent store back to ensure it is recreated properly. The programmatic way for iterating through each entity is both … Read more