UIContentSizeCategory availability check to fix "Cannot find type 'UIContentSizeCategory' in scope"

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I have a shared library (for mac and iOS app), and I'd like to use UIContentSizeCategory there. Since it is a part of UIKit, I added

import SwiftUI
#if canImport(UIKit)
import UIKit
#endif

to a file header and then declare my extension (to convert from SwiftUI to UIKit size category):

#if canImport(UIKit)
@available(iOS 8.0, macCatalyst 13.1, tvOS 9.0, *)
extension ContentSizeCategory {
    var uiContentSizeCategory: UIContentSizeCategory {
        switch self {
        case .extraSmall: return .extraSmall
        case .small: return .small
        case .medium: return .medium
        case .large: return .large
        case .extraLarge: return .extraLarge
        case .extraExtraLarge: return .extraExtraLarge
        case .extraExtraExtraLarge: return .extraExtraExtraLarge
        case .accessibilityMedium: return .accessibilityMedium
        case .accessibilityLarge: return .accessibilityLarge
        case .accessibilityExtraLarge: return .accessibilityExtraLarge
        case .accessibilityExtraExtraLarge: return .accessibilityExtraExtraLarge
        case .accessibilityExtraExtraExtraLarge: return .accessibilityExtraExtraExtraLarge
        @unknown default:
            assertionFailure("Unknown ContentSizeCategory: \(self)")
            return .medium
        }
    }
}
#endif

However, I still get Cannot find type 'UIContentSizeCategory' in scope error when building this, even though I have checked platform availability of UIContentSizeCategory in docs and added @available check for these platforms.

How should I properly limit the availability of the extension to make it build?

Thanks for any advice! Tomas

EDIT: Very weird thing is that if I change the check to #if !os(watchOS) && canImport(UIKit), it builds.

Why is that? Isn't @available(iOS 8.0, macCatalyst 13.1, tvOS 9.0, *) enough to exclude watchOS target?

swiftui
1 Answers

Isn't @available(iOS 8.0, macCatalyst 13.1, tvOS 9.0, *) enough to exclude watchOS target?

No, we have to add explicitly @available(watchOS, unavailable)

Like

#if canImport(UIKit)
@available(iOS 8.0, macCatalyst 13.1, tvOS 9.0, *)
@available(watchOS, unavailable)
extension ContentSizeCategory {
user_122990300
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