Also worth a look are:
https://github.com/iosre/iOSAppReverseEngineering
https://www.amazon.com/NSHipster-Obscure-Topics-Cocoa-Object...
and the ultimate:
https://github.com/iosre/iOSAppReverseEngineering
https://www.amazon.com/NSHipster-Obscure-Topics-Cocoa-Object...
and the ultimate:
As for modern RE resources, I can recommend Jonathan Levin's series of books on MacOS and iOS internals as a good reference. It's probably the newest information you are going to be able to get on iOS/mac internals outside of apple.