No, you canβt.
Each version of Xcode includes only one version of the Swift compiler. Using the new version of Xcode will force you to accept the new Swift syntax.
An automatic converter is available under Edit -> Convert -> To Latest Swift Syntax .
IOS version requirements are not affected by the use of Swift 2 (or Xcode 7). Applications created using Xcode 7 and written in Swift 2 can run on iOS 7 (the same conditions / limitations as before).
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