slide controls are kind of special under iOS - but they do work and they do appear
- won't work in a PopOver with portals with a one-finger-wish. Taping with one finger works (better)
Could You provide some more details?
Portals can be used in a slide control that is inside a popover, but only if the portal does not have a scroll bar--which severely limits the utility of the portal. With a scroll bar equipped portal in the slider that's inside a popover, the portal (but not the scroll bar) becomes a "dead zone" where you can't flick the slider sideways. You can still get things to work by starting the swipe gesture outside of the portal rows--not ideal but it is what it is.