How can an iOS 7 App make itself transparent to see a user's home screen image?

Question

I\'ve seen some apps for example (Vesper, or iPad\'s reminders app) make use of a user\'s home screen background image. How is that possible?

It must be some sort o

Answer 1

iOS 13 beta 1 supports setting UIApplicationIsOpaque to NO in Info.plist. But, it’s not documented so it will maybe be removed or not allowed on the App Store.

Answer 2

I haven't tried it myself, but I hear that the private method [[UIApplication sharedApplication] _setApplicationIsOpaque: NO] may do what you're after.