How can I read the previous edition of a book on iBooks? I accidentally updated my "The Swift Programming Language" book to the Swift 4 edition from Swift 3.1. Can I revert back to 3.1?
In short, yes. It's not actually a "revert" back to the Swift 3.1 ebook. You simply just re-download it side by side the Swift 4 book, as I have done. Just open your Books app and search for the title, and if it's still available it'll show up.