My app get crashed today while updating on Xcode9, testing on iOS11.
After adding NSPhotoLibraryAddUsageDescription then it works, even i already had NSPhotoLibraryUsageDescription.
Ive read about them, one supported since iOS6, one iOS11 but Apple didn't mention what's difference between them. https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW73
If i keep the new one (NSPhotoLibraryAddUsageDescription), will it work for iOS 8 also or i have to keep both of them?
To answer the last question on my own:
You need to declare both NSPhotoLibraryUsageDescription and NSPhotoLibraryAddUsageDescription to get it WORKS on both iOS 9, 10.3 and 11.
Technically it's different.
I used to not declare NSPhotoLibraryUsageDescription, it works fine on iOS 9 and 11 but failed and crashed on iOS 10.3.
This is a really bad version controlling from Apple while higher version doesn't comply and support older version permission.