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") #endif
Sponsored You’re already busy updating your app for Swift 4.2 and iOS 12, so why not let Instabug help you find and fix bugs? Add just two lines of code to your project and receive comprehensive reports with all the feedback you need to ship a world-class app – click here to learn more!
Available from iOS 7.0
Did this solution work for you? Please pass it on!
Other people are reading…
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Learn Swift faster!
Take your Swift learning to the next level: buy the Hacking with Swift e-book and get bonus material to help you learn faster!