Attach view to different edges or use priorities

[SemyonovE]

Hi! Can I use some priorities or attach anchor of the view to more than one view?
I have header with attaching in top of the base view, and grey view below the header. But when my base view compressed I want compress header.

Default:

Compressed:

Code:

headerView.pin
    .top()
    .horizontally()
    .margin(.edgeInset)

greyView.pin
    .below(of: headerView)
     .horizontally()
    .bottom()
    .minWidth(.zero)
    .minHeight(.zero)
    .margin(.spacer, .edgeInset, .edgeInset)

And also what am I doing wrong? I should set minimum dimensions of the grey view, cos when I compress base view a lot from correct size, greyView has previous frame (I think this is cos some computed values of the greyView frame is negative).

For example (without .minWidth(.zero).minHeight(.zero)):

I would like to use .bottom() for headerView with low priority maybe.
I can use some calculations with sizeThatFits of the views, but want to solve this issue only by library with internal autoSizeThatFits of the views.