[jlmendezbonini]

> I'd like to know if I can write an app in Swift that can run on iOS6.

No. From Xcode6 release notes:

"iOS 7 and OS X 10.9 minimum deployment target

The Swift compiler and Xcode now enforce a minimum deployment target of iOS 7 or OS X Mavericks. Setting an earlier deployment target results in a build failure."

[mwcampbell]

To clarify, is Xcode 6 enforcing a minimum deployment target of iOS 7 even if the app is written in Objective-C and not Swift? If so, I think I'll need to stay on Xcode 5 a bit longer.

[altyus]

iOS6 user base will be miniscule in a few weeks unless you are targeting corporate or education markets which update slowly.