The link to source code in the book (https://store.raywenderlich.com/products/swift-ui-by-tutorials-source-code) is showing 404 error.
thanks Tim! I’ve referred this to our webmaster
actually, the printed book isn’t available yet? so you have the digital version, and that comes with the source code
As @Audrey pointed out, the downloads for the digital copy of the book come with all the source code you need. You can get it here:
The link you had is for the printed book, which is not yet available.