I've brought the Swift Programming Series back to Apple Books, with optimized editions of The Swift Programming Language from Swift 5.8 onward.
You can also download PDF and EPUB editions across Swift releases from the Swift Book Archive.
Read more here: Swift Book PDF: The Swift Programming Language is back on Apple Books — plus PDF and EPUB archives
Quick update on the availability of the book on Apple Books (May 12, 2026)
Unfortunately, the book will no longer be available on Apple Books for reasons outside my control.
You can download the EPUB file from the Swift Book Archive and open it with the Books app. The book will sync across your devices.