Checking permission before using UIImagePickerController

Question

One of my earlier version of iOS app uses UIImagePickerController. During that development period there's no permissions involved to access the photos/videos from album. But in latest version, it asks for permission of user to access album.
How can I check if the user has granted permission for accessing the photo album on the device with the help of UIImagePickerController (not using ALAssetLibrary)?

Answer 1

Update:

Since the PhotoKit framework was introduced in iOS 8 the best way to determine status is on PHPhotoLibrary.

Objective-C:

[PHPhotoLibrary authorizationStatus];

Swift:

PHPhotoLibrary.authorizationStatus()

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There isn't anything in the public interface for UIImagePickerController that could be used to determine photo data authorization status. Alas, it seems the only option for determining authorization status is +[ALAssetsLibrary authorizationStatus].