UICollectionView动态调整高度以显示所有内容而无需滚动

Question

I would like to dynamically resize UICollectionView height and display all cells without scrolling when page loads.

I tried following codes in viewDidLoad but didn't work

self.constraintTableViewHeight.constant = self.myProfileCollectionView.contentSize.height

or

self.constraintTableViewHeight.constant = self.myProfileCollectionView.collectionViewLayout.collectionViewContentSize().height

Answer 1

call

self.view.layoutIfNeeded()

after

self.constraintTableViewHeight.constant = self.myProfileCollectionView.contentSize.height

If it will not help try to move this code to view viewWillAppear method.