rn_oreo/ios/rn_oreo.xcworkspace in Xcode or run
xed -b ios then you can change:
The bundle identifier is the unique string that identifies your application to the system.
Bundle identifiers are usually (not always) written out in reverse DNS notation (I.e com.myCompany.myApp).
You can bundle Identify change under app name.
Assets.xcassets in the Project navigator and then choose
Now just drag the right sized image (in .png format) from Finder onto every blank in the app set. The app icon should be all set up now.
Check video guide on how to change icon by tool: https://www.facebook.com/rnlab.io/videos/2215170862111679/?v=2215170862111679