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I want to know how does facebook native app call my native iOS app.
Facebook requires App bundle id, app store id, and url sufix (optional). What I want to know is: how facebook process these information and open my native app?
It uses custom URL schemes.
What you basically do is define a "url" for your app so you can access it from anywhere in the OS (using that URL). What FB does, when it opens Safari to authenticate you for example, is specify YOUR app’s custom url as a callback URL, so when it finishes, it calls that url and that redirects it back to your app.
You can test this by setting a custom URL for your app, firing up Safari, and typing that url. It will jump straight to your app.
You can read more about it here.