Get object position within view within scroll view

Question

I have such hierarchy:

scroll view
--- container view
----- cycle view

This scroll view also can zoom. And I need to show view2 in center of cycle view when I pressed this cycle view(there I have tap gesture recogniser). But view2 should be lye on container view because we also need to zoom it with cycle view.

I try to get rect where need to show view2 with this approach.

func getSourceRect(for cycleView: UIView) -> CGRect {
   let rectOnContainer = cycleView.convert(cycleView.frame, to: containerView)
   let rectOnScrollView = containerView.convert(rectOnContainer, to: scrollView)
        
   return rectOnScrollView
}

and then I do next

let sourceRect = getSourceRect(for: cycleView)
view2.center = CGPoint(x: sourceRect.midX, y: sourceRect.midY)

It doesn't work. Please help me understood this behaviour and get this position where I can show view2

So you want view2 to be centered on the cycle view but attached to the container view? — Yogurt
– Yogurt, Commented Nov 29, 2021 at 20:20
@Biclops yes, need to be centered. And also cycleview's parent is container view. — Taras
– Taras, Commented Nov 29, 2021 at 20:23

Yogurt · Accepted Answer · 2021-11-29 20:25:22Z

1

So you want view2 to be centered on the cycle view but attached to the container view?

If this is true then

// if view2 and cycle view's parent is container view 
// then there should not be a need to transform view2's 
// coordinate space
view2.center = cycleView.center

// make sure z position is correct so that cycle view isn't obscuring
// view2's visibility.
view2.parent?.bringSubviewToFront(view2)

answered Nov 29, 2021 at 20:25

Yogurt

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