Equivalent of .visible for iosView

In the process of converting from Desktop to IOS what were windows are being converted to iosViews.
In Desktop I was able to test to see which windows were visible (and needed updating). In iOS, how do I tell which iosViews are visible - presumably with split view there could be upto 2 at any one time.

An iOSView is visible from the moment its Activate event is called until its Deactivate event is called.

Yes, so I guess the answer is to have own .visible property triggered by those 2 events…

That’s it, thanks.