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I have checked the question related to how to find the current Swift version by the command swift --version, but how can I upgrade my Swift version from 3.1 to 3.2? (because the Xcode 9 only supports Swift 4.0 & Swift 3.2)
To build successfully both in Xcode 8 & Xcode 9, it's better to upgrade Swift from 3.1 to 3.2. But how?
My target was to make sure build successfully both in Xcode 8 & Xcode 9, So that publish with Xcode 8 would be OK, and try out the feature of Xcode 9 is OK too. So I will not upgrade code to swift 4.0 yet until Xcode 9.0 official edition is published.
After my test, I can't convert my code from swift 3.1 to 3.2 by Xcode 8.3.3's 'edit->convert' function.
The reason why I try to convert the code to Swift 3.2 is that I will get error of "Module compiled with Swift 3.1 cannot be imported in Swift 4.0" if I build the code with Xcode 9.
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Go to project navigator> Build Settings. search for swift Compiler - Language and change this to desired version.
Switching Swift Toolchain It can be done using Xcode, Go to Xcode->Preferences->Components-> Toolchains section and Select the Swift. 3.1. 1 snapshot, this will set the new Swift version for the local Xcode. You may need to restart Xcode.
You can find the Toolchains menu under Xcode menu, where you can easily switch between installed Swift toolchains. Toolchains menu.
You need to redownload Xcode 10.1 from this page, convert your code to Swift 4, then redownload Xcode 10.2 and convert to Swift 5.
You can try this:
Noted: These step using Xcode 9
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