I installed the latest xcode and tried to upgrade my project to swift 1.2. I wanted to switch back to earlier version of swift 1.1.
3 Answers
You can download the older version of Xcode on https://developer.apple.com/downloads/ all you need is to create an developer account.
Comments
Updated for Xcode 8.1:
As per the docs, Switch between toolchains in the Toolchains pane of Components preferences. This pane is visible only when an alternative toolchain is installed.
[...]
Alternative toolchains must be manually installed into /Library/Developer/Toolchains/ or ~/Library/Developer/Toolchains/ to be recognized by Xcode and appear in the Toolchains pane of Components preferences.
// Old response for XCode 7.3:
You can select which version of Swift you'd like to use in Xcode 7.3 via the following: (Menu) XCode > Toolchains > (select your version)


