I have changed the appicon in xcode project. But My sharing extension keeps showing old one. When I delete appicon files then it shows nothing but when I add again it shows me old one.
By the way it shows correct in the simulator but not in device
Try to delete app, reboot device and install again. It's work for me. As I understand, iOS save app icon and launch screen to cache after first app running and load it from cache until rebooting.