Looks like this is a duplicate of this issue:
https://bugs.swift.org/browse/SR-1486 <https://bugs.swift.org/browse/SR-1486>
I’m curious if anyone knows whether that is actually a bug, or a behavioural
choice on Swift’s part?
> On 2 Aug 2017, at 10:31 am, Rod Brown via swift-users <swift-users@swift.org>
> wrote:
>
> Hi everyone,
>
> Something I’ve come across in iOS 11 is that you can’t override properties
> that are only available on iOS 11 when deploying with a deployment target
> less than the current target.
>
> For example the following code is invalid:
>
> extension UIViewController {
>
> @available(iOS, introduced: 11.0)
> open override var additionalSafeAreaInsets: UIEdgeInsets {
> didSet {
> // Do work here only relevant to iOS 11
> }
> }
> }
>
> This would be easily overridden in Obj-C, but I can’t do it in Swift. Is
> there any reason why this limitation exists?
>
> Thanks,
>
> Rod
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