Question

我正在迁移我的iOS应用以使用NSPersistentContainer。默认情况下，此类将其持久性存储文件定位在Library/Application Support目录中;以前我的商店文件存储在Documents目录中。

如果在旧目录中找到商店文件，我添加了一些代码来移动商店文件：

func moveStoreFromLegacyLocationIfNecessary(toNewLocation newLocation: URL) {

    // The old store location is in the Documents directory
    let legacyStoreLocation = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true).appendingPathComponent("books.sqlite")

    // Check whether the old store exists and the new one does not
    if FileManager.default.fileExists(atPath: legacyStoreLocation.path) && !FileManager.default.fileExists(atPath: newLocation.path) {

        print("Store located in Documents directory; migrating to Application Support directory")
        let tempStoreCoordinator = NSPersistentStoreCoordinator()
        try! tempStoreCoordinator.replacePersistentStore(at: newLocation, destinationOptions: nil, withPersistentStoreFrom: legacyStoreLocation, sourceOptions: nil, ofType: NSSQLiteStoreType)

        // Delete the old store
        try? tempStoreCoordinator.destroyPersistentStore(at: legacyStoreLocation, ofType: NSSQLiteStoreType, options: nil)
    }
}

调用destroyPersistentStore(at: url)后，商店文件仍然存在于磁盘上。这些会在某些时候自动清理吗？或者我应该删除它们？我是否还要删除.sqlite-shm和.sqlite-wal个文件？

在NSPersistentStoreCoordinator上调用destroyPersistentStore后，我应该删除底层持久存储文件吗？

0 个答案: