iOS: Delete ALL Core Data Swift

Question

I am a little confused as to how to delete all core data in swift. I have created a button with an IBAction linked. On the click of the button I have the follow

Answer 1

Swift 4

From iOS 9, there is the possibility of erasing persistent storage. For better maintenance – create NSPersistentStoreCoordinator extension with abstract function.

extension NSPersistentStoreCoordinator {
    func destroyPersistentStore(type: String) -> NSPersistentStore? {
        guard 
            let store = persistentStores.first(where: { $0.type == type }),
            let storeURL = store.url 
        else {
            return nil
        }

        try? destroyPersistentStore(at: storeURL, ofType: store.type, options: nil)

        return store
    }
}

Then destroying SQLite persistent storage looks pretty simple:

let coordinator = persistentContainer.persistentStoreCoordinator
let store = coordinator.destroyPersistentStore(type: NSSQLiteStoreType)

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Recommendations

1. Update destroyPersistentStore function which is no-nullable and throws specific errors, for example CoreDataError enum.
2. Probably you want to refresh your persistent storage. For this, you can use addPersistentStore function of NSPersistentStoreCoordinator, with retrieved NSPersistentStore object from destroyPersistentStore.