After updating to Xcode 8.2 the compiler throws one error for my App target:
“Use Legacy Swift Language Version” (SWIFT_VERSION) is required to be con
This is the only thing that worked for me...
For errors with pods. Basically we need to enable “Legacy Swift Language”. Select your pod framework (by clicking on it in the error navigator) and under Build Settings find “Use Legacy Swift Language Version”
Set it to “Yes”. Then “Build & Run” again to test it.
Check out this post: http://rebeloper.com/downgrade-swift-3-swift-2-3-xcode-8/