'Swift availability check for macCatalyst / iOS failing

I have added an iOS 15+/macCatalyst 15.0+ function to my app and now it is crashing when run on an M1 iMac through Mac Catalyst (Designed for iPad).

I have an availability check around my function however when run on my Mac (macOS 11.6), the code within the availability check still runs, and crashes.

if #available(iOS 15.0, macCatalyst 15.0, *) {
    dataSource.applySnapshotUsingReloadData(fullSnapshot, completion: nil)
} else {
    dataSource.apply(fullSnapshot, animatingDifferences: false)
}

I understand the Designed for iPad mac catalyst runs as iOS, and I can confirm it is running as iOS 14.7 using print(UIDevice.current.systemVersion) so why is it running code that is set to run on iOS 15+ only?

Am I doing my macCatalyst check right?

Solution 1:^[1]

I need to check for this but I need to add functionality if running as an iOS app on the Mac and this seems to do the trick:

if ProcessInfo.processInfo.isiOSAppOnMac {
    // blah blah yada yada etc etc
}

There is also an isMacCatalystApp value as well.

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Solution 1

'Swift availability check for macCatalyst / iOS failing

Solution 1:[1]

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Solution 1:^[1]