This is a frequently repeated oversimplification. (L)GPL is not incompatible with iOS, it is incompatible with the Apple App Store.
It is fully, 100% GPL-compliant to release a (L)GPL'd iOS application linked to a (L)GPL'd library, as source code, with instructions on how to build and load on your iOS device.
It is /probably/ not compliant to distribute that through the App Store, though there is some disagreement, and it has never been taken to court.
It is /definitely/ not compliant to distribute a proprietary app that links to an (L)GPL'd library through the App Store, since Apple only permits static linking.