Pro Swift – by Paul Hudson

Loved it! The book is full of little nuggets and practical advice on how to be a better Swift developer. It shouldn't be your first Swift book, but it could be a great second one. There are two traits of software engineer I value the most—being pragmatic (over being "clever" or tribalistic) and have a craftsman mindset. Paul seems to have both, and he shares his knowledge and experience through those two lenses. This book is my favorite Swift book so far, and I've read quite a lot of them.