GMImagePicker 2.5.0 + iOS 14 new photo permissions crash

[mjanzetic]

In iOS 14 you can choose if you want to allow an app to use all, selected or no photos at all.
After selecting "all" the app crashes.

A similar issue is described here:
flutter/flutter#65995 (comment)

This might be due to the UIIMagePickerController being replaced by the PHPickerViewController : https://developer.apple.com/documentation/photokit/phpickerviewcontroller

[roycornelissen]

Thanks for reporting. Need to figure out how to migrate to PHPickerViewController... hope I can find the time. Would love it if someone could help out with a PR.

[roycornelissen]

Please see the discussion I opened in #86 .