UICollectionViewController Error in Swift 3.0: must be initialized with a non-nil layout parameter

Question

I\'m new to iOS development. I\'ve been learning Swift, and today, I tried using UICollectionViewController.

My code is as follows:

 class ViewContro         


        

Answer 1

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
    let cellSize = CGSize(width: 90, height: 120)
    //
    return CGSizeMake(cellSize)
}

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets {

    return UIEdgeInsetsMake(top: 20, left: 10, bottom: 10, right: 10)
}