@available, #available
// ⭐️ if #available
// iOS 13 or later any other unknown platforms announced in the future
// ↳ ╭────╮ ↑
if #available(iOS 13, *) {
// use UICollectionViewCompositionalLayout
} else {
// show sad face emoji
}
// ⭐️ guard #available
guard #available(iOS 13, *) else { return }
// ⭐️ @available
@available(iOS 11, macOS 10.13, *)
func newMethod() {
// Use iOS 11 APIs.
}
#if os(iOS)
var body: some View {
NavigationView{ ... }
.navigationViewStyle(StackNavigationViewStyle())
}
#else
var body: some View {
NavigationView{ ... }
.navigationViewStyle(DoubleColumnNavigationViewStyle())
}
#endif
check iOS version
// use case
Text("Hello, world!")
.padding()
.if(.iOS14) { $0.background(Color.red) } // ⭐️ use case
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