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When I opened my project in Xcode 10.2, I got this message:
Unsupported Swift Version …Use Xcode 10.1 to migrate the code to Swift 4.
Where can I still find Xcode 10.1? So the process is to have 2 versions of Xcode, first migrate to Swift 4 then 5?
PS: If I migrate the code to Swift 5, does the app still bundle Swift binary? If yes, then what's the benefits since the app still bundle Swift binary? If no, then how does it handle iOS 11.x?
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You will need to manually select the new scheme, then run Edit -> Convert -> To Current Swift Syntax to migrate the remaining schemes. Or you can create a scheme that includes all the targets from your project, and have it selected before running the migration assistant.
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 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.
The only other option I can think of is changing your Swift Version in your apps bundle and then seeing if it lets you convert but I don't think it will.
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