How to check the Swift version at compile time
Swift gives us the #if swift build configuration option, which lets you compile certain code only if a specific version of the Swift compiler is detected. This is particularly useful for libraries that need to support multiple incompatible versions of Swift at the same time, because only one version of their code will ever be compiled.
In the example below, the print() code will display one of two messages depending on whether you're using an old version of Swift:
#if swift(>=4.2)
print("Running Swift 4.2 or later")
#else
print("Running old Swift")
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Available from iOS 7.0
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