问题
I'm currently using Xcode 9 but I have downloaded and "installed" the iOS device support files for 12.
Am I good to go for the March iOS 12 deadline?
Is satisfying the requirement as simple as submitting a new build when needed with my current setup or is more work required?
回答1:
You need to migrate to Xcode 10 to get the iOS 12 SDK support files. Your app must be build with this iOS 12 sdk support. This is not the same as pulling iOS 12 device support into Xcode 9 from Xcode 10.x versions. Currently, going directly to 10.1 is the best move. Fortunately, Swift 3 and 4 are currently supported in Xcode 10.1. So if you are still on Swift 3 you will not have to also migrate your swift version.
Xcode 10.2 (currently in beta) will add support for swift 5. Migrating from Xcode 10.1 to 10.2 will require you to be on Swift 4.2 as a minimum version, with Swift 5 being recommended.
After the deadline, any app submissions will need to be built with Xcode 10 or better, or else they will be rejected.
来源：https://stackoverflow.com/questions/54795692/apple-requiring-all-app-updates-to-built-with-ios-12-sdk-by-march-2019-question