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I want to make an app like Instagram but the problem is where to store all text and images data, I have used Instagram when there is no connectivity available then app will show the last feeds even when app is freshly openend (not from background). It uses core data or sqlite.
It’s not known what Instagram uses. Use whatever you feel most comfortable with. Anything is possible with any storage technology, although some might fit better than others. Also, regarding your question on “core data or sqlite”, you can use Core Data with an SQLite database as a backend (way easier than accessing raw SQL). You can also use other backends with Core Data: binary and XML.