Question 67094 in IOS Swift Question posted in
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Conditionally include macOS-only code in a SwiftUI (Mac Catalyst) project? – Ios swift

I am writing an app that runs on both iOS and macOS, using Mac Catalyst with Swift.

I want to set a property that is only available on macOS but I cannot find a way using #available or @available to prevent the compiler from including this line of code in the iOS builds:

This syntax does not work because the mandatory trailing * includes all iOS versions.

if #available(macCatalyst 13.0, *) {
    view.showsZoomControls = true
}

I tried adding a nonsense version of iOS using iOS 999 but that didn’t work either, because the property is marked strictly unavailable in iOS.

Using @available there’s a longhand syntax using introduced: that allows per-OS versions to be specified and requires a separate @available entry per OS but I can’t see any way to use that. It seems you can’t use @available on a block of code.

Is there really no sane way to do this?

For reference, the definition of this specific property is:

@property (nonatomic) BOOL showsZoomControls
    API_AVAILABLE(macos(10.9), macCatalyst(13.0)) 
    API_UNAVAILABLE(ios, watchos, tvos);
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2

Answers


  1. Chosen as BEST ANSWER
    0

    Crisis averted - it seems that available is the wrong hammer for this nail.

    What's working for me now is the much simpler:

    #if os(macOS)
view.showsZoomControls = true
#endif

  2. 0

    You can identify/restrict Mac Catalyst with target environment

    #if targetEnvironment(macCatalyst)
view.showsZoomControls = true
#endif
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