Import packages depending from OS version

November 28, 2023

When I’m writing a code, I can use @available and #available directives, e.g.:

@available(watchOS 10.0, *)
    class ClassWhichUsesNewfunctions: NSObject {
}

but they doesn’t work in import section. Obviously, I want my app could be used on previous OS versions too, so I can’t simply change target’s destination.

I tried

if #available(watchOS 10.0, *){
    import WorkoutKit
}

and

@available(watchOS 10.0, *)
import WorkoutKit

but both of them gives compilation errors Statements are not allowed at the top level and '@available' attribute cannot be applied to this declaration

So how could I import newest packages? Thank you in advance.

>Solution :

There is another way, you can use the canImport macro in this circumstance. i.e

#if canImport(WorkoutKit)
import WorkoutKit
#else
import Foundation
#endif

func doStuff() {
    #if canImport(WorkoutKit)
    print(SingleGoalWorkout(activity: .bowling))
    #else
    print("No workout here")
    #endif
}