collectionView(collectionView, didSelectItemAt: indexPath) - Cannot call value of non-function type 'UICollectionView

Question

I have a collectionView. I have its dataSource and delegate methods set and I call func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { } when the user first makes a selection which works fine.

If the user leaves the view controller and comes back to it I call the below methods in viewWillAppear to programmatically force cell selection and scroll back to the cell that was initially chosen.

let whateverCellWasChosen = 29
let indexPath = IndexPath(item: whateverCellWasChosen, section: 0)

collectionView.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: false)
collectionView.selectItem(at: indexPath, animated: false, scrollPosition: .centeredHorizontally)

// problem is here
collectionView(self.collectionView, didSelectItemAt: indexPath)

But when trying to call the manual version of didSelectItem I keep getting an error of:

Cannot call value of non-function type 'UICollectionView'

The error stems from the first argument that accepts the collectionView. Why is it giving me a problem?

Answer 1

采用

collectionView.delegate?.collectionView!(collectionView, didSelectItemAt: indexPath)