UIViewAutoresizing for siblings?
I know `UIViewAutoresizing` is relative to the superview. But, is there something like `UIViewAutoresizing` for siblings?

E.g., let's say I have a containerView with two subviews:

- containerView (height: 100)
  - subview1 (height: 30)
  - subview2 (height: 70)

Can I tell UIKit to automatically resize subview2 to fill the rest of containerView when subview1's height changes?

Right now, I'm making my view controller (VC) a delegate of subview1. subview1 then notifies the VC whenever its height changes, and the VC resizes subview2. But, I was wondering if there's an automatic way to do this.
UIViewAutoresizing for siblings?
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I know `UIViewAutoresizing` is relative to the superview. But, is there something like `UIViewAutoresizing` for siblings?

E.g., let's say I have a containerView with two subviews:

- containerView (height: 100)
  - subview1 (height: 30)
  - subview2 (height: 70)

Can I tell UIKit to automatically resize subview2 to fill the rest of containerView when subview1's height changes?

Right now, I'm making my view controller (VC) a delegate of subview1. subview1 then notifies the VC whenever its height changes, and the VC resizes subview2. But, I was wondering if there's an automatic way to do this.