Collectionview inside multiple tableview cells, how to handle selection?

Question

I have a tableview, consisting say, 10 cells.. Each tableview cell has a collectionview inside it,

I handle each collectionView's selection's style change by overriding isSelected this code

override var isSelected: Bool {
    didSet{
        if(isSelected){
            backgroundColor = .black
        } else {
            backgroundColor = .red
        }
    }
}

It works at this point.. But when i scroll the tableview, i see that selection style (.red) is applied on different collection views that in other cells as well ( because of reuseable cell of course )

I want to keep selection stickied to the collectionview that has a selection inside it, and avoid selection applied on other collectionviews as well

first you see that collectionview has a selected item inside

when i scroll, i find another dequeued collectionview, with the same selection !, the selection was only at indexpath row 1 not row 5

Answer 1

What I have done is added a variable named selectedIndex in the modelData.

Check the condition in cellForRowAt and modify the selectedIndex variable on didSelect method