Fix add Swift version to podspec file

[hons82]

Without this you have to manually specify the Swift version every time you do a pod update or pod install

[evgenyneu]

Hi @hons82, thanks for the update. Is this setting documented yet on CocoaPods web site? I could not find anything.

[hons82]

I'm not sure about that...
Using the current Cocoapods you'll need that setting to be set manually with the podspec file.
Using the RC you can add a .swift-version file to your repo specifying the version.

We did both in this repo just to be sure

[evgenyneu]

Ok, I think we can wait for some official documentation first before merging this. Thanks.

[hristouzunovaz]

Hi @evgenyneu, what is the status of this PR. I was migrating my project from Swift 2.2 to Swift 3 in Xcode 8.1, and it turns out Xcode cannot correctly infer the SWIFT_VERSION. What I see in the Build Settings of the project is Unsupported Version: 3.0, while I believe it expects something else.

[evgenyneu]

Hi @hristouzunovaz, I am still waiting for cocoapods to officially implement the swift version setting in the podspec file. As written here, cocoapods "defaults to Swift 3.0". I would like to know:

• What exactly is your build error, could you please send a screenshot and full error text?
• What is the version of KeychainSwift in your Podfile?
• What version of cocoapods are you using pod --version?