If you want to integrate Google Drive into your iOS application, you must use the Google API Objective-C client library that supports Google Drive.
For authorization, the client library will use the web view to initiate the OAuth 2 stream.
You can see an example example application that uses Google Drive.
As for the native iOS application for iOS, there is currently no way to interact with it. Although, if we do this, we will probably add these functions to the Objective-C client library :)
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