Swift 3 iOS compatibility

Question

I\'m new to Apple developing and soon I will distribute my app via AppStore. So now I\'m using Swift 3 and by default the deployment target is set to iOS 10.0 It means that

Answer 1

You should use Swift 3.x (it's the latest version of Swift since this answer has been posted).

iOS version is NOT related to the Swift version you should use, instead, some of the new provided apis do support a minimum version of the OS. But -again- it's not related to the programming language it self. For example: an application has been built via Swift 2.x (Deployment Target 9.x) should work on iOS 10; When updating the IDE (xcode), it will support -by default- the latest version of the programming language -Swift-.

Also, You could do:

if #available(iOS 10, *) {
    // use an api that requires the minimum version to be 10
} else {
    // use another api
}