I used this book and I found it to be excellent. https://www.amazon.com/gp/product/B007R3U9W2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazo

I used this book and I found it to be excellent. https://www.amazon.com/gp/product/B007R3U9W2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B007R3U9W2/ref=ppx_yo_dt_b... It is mainly geared toward MacOS development but there is a section specifically about iOS for things like Audio Session. You will probably still need to keep the Apple docs open for iOS specific stuff here and there but in general the book does a GREAT job of bridging audio theory, with apple's architectural decisions, with low level implementation details. IMO thats the great strength of books, they tie it all together and this one - for me at least - checked all the boxes.