Swift iOS CoreData到闪存驱动器（导出和传输）

Question

I've written an app (to be run on an iPad) that saves entities via CoreData. However, it will be used in an environment in which wireless connections may be inhibited and file transfer may need to be done physically.

Is there any way to export the app's coredata model and saved data entities to a lightning flash drive and then import the data contents onto another iPad running the same app?

Thanks!

Answer 1

It is tricky but possible.

1. Use a SQLite file for your database. CoreStore provides a simple interface for SQLite.
2. Get a lightning flash drive with an app that allows receiving and sending arbitrary files from and to other apps.
3. Send your your SQLite file on iPad A via UIDocumentInteractionController to the lighting flash drive app and store it on the drive.
4. Plug the drive into iPad B and send the file from the flash drive app to your own app.
5. Load the database from the SQLite file.

It is not possible (without custom hardware and licenses) to access a lightning flash drive directly, so you need an existing drive with own app to transport the data.

But why can't you use wireless connections anyway? Even without a cellular network or a WiFi access point you can still communicate via Bluetooth or ad hoc WiFi between the iPads.