UICollectionview inside uitableview cell height automaticdimention not working while set collection view

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Problem:

I'm having one tableviewcell inside that one collectioviewcell tableview height is dynamic.But sometimes tableview contentsize came as zero.How to solve that?

My code is like below

            Cell.collViewHeightConstraint.constant = Cell.collectionView.ContentSize.height

 

Solution:

            Cell.collViewHeightConstraint.constant = Cell.collectionView.collectionViewLayout.collectionViewContentSize.height


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