2017-09-06 0:20 GMT+07:00 Jordan Rose via swift-users <swift-users@swift.org >:
> > Unfortunately this will only work for pure Swift apps; the support > libraries for Foundation, UIKit, etc are built against the Xcode 9 SDKs and > will not work with Xcode 8. I'm afraid you're stuck with Swift 3 if you > want to make Cocoa or Cocoa Touch apps, at least officially. > That's very unfortunate indeed. I'm just starting to write a book about Swift and programming on Apple platforms (not just iOS) since a few weeks ago, I think it'd be better if I use Swift 4 and XCode 9 as the reference for the book since it's the newest version with a bunch of new features, instead of using the about-to-get-old Swift 3 and XCode 8. Well, I think I need to postpone the book until I got a new Mac (which is uncertain). Actually, I plan to buy a new Mac from the sale of the book. So, obviously I need a new strategy. :) Thank you. -- Regards, –Mr Bee
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