How to Reduce App’s Size

Hi all, I'm developing a mobile game for iOS. using Xcode. I have compressed all the PNG and JPEG files, also, remove unused resources and minimize resources imported from libraries. but the app's size is still too large. (it shows that its size is1.1GB...) I also import animation by png sequence. (not too much and all the png is compressed.) How can I reduce my app size to be smaller?