> On Sep 4, 2017, at 20:06, Mr Bee via swift-users <swift-users@swift.org> > wrote: > > > 2017-09-05 3:47 GMT+07:00 Fritz Anderson via swift-users > <swift-users@swift.org <mailto:swift-users@swift.org>>: > > In your position, I’d go to the Downloads part of Swift.org > <http://swift.org/> and fetch the latest build of the Swift 4 toolchain for > Mac. (It’s still in flux, but it’ll probably be promoted to latest/stable > this month.) > > Install the toolchain. This adds a Toolchains tab to the Components section > of the Preferences window. Select Swift 4.0 Snapshot. > > Ok, I'll try it out once Swift 4 is officially released. So, that means Swift > 4 will work on Xcode 8, I suppose.
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. Jordan
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