I'm looking to use the following function but unfortunately it's not being called.
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewFlowLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets {
let cellCount = Double(collectionView.numberOfItems(inSection: section))
if let cell = collectionView.cellForItem(at: IndexPath(row: 0, section: section))
{
let cellWidth = Double(cell.frame.size.width)
let totalCellWidth = cellWidth * cellCount
let cellSpacing = Double(collectionViewLayout.minimumInteritemSpacing)
let totalSpacingWidth = cellSpacing * (cellCount - 1)
let leftInset = (collectionView.frame.width - CGFloat(totalCellWidth + totalSpacingWidth)) / 2
let rightInset = leftInset
return UIEdgeInsetsMake(0, leftInset, 0, rightInset)
}
return collectionView.layoutMargins
}
I'm getting the following console errors but my cell is smaller than my collectionView and I've set the section insets and layout margins to 0.
2017-03-30 11:25:14.624 Prep[92400:1862856] The behavior of the UICollectionViewFlowLayout is not defined because: 2017-03-30 11:25:14.624 Prep[92400:1862856] the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values. 2017-03-30 11:25:14.624 Prep[92400:1862856] The relevant UICollectionViewFlowLayout instance is , and it is attached to ; layer = ; contentOffset: {0, 0}; contentSize: {0, 68.5}> collection view layout: . 2017-03-30 11:25:14.625 Prep[92400:1862856] Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger. cell height --> 42.0
Protocols
class OverviewViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
@IBOutlet weak var vipCollectionView: UICollectionView!
var hostedMeetingsArray: [String]?
var vipArray: [Attendee]?
class OverviewViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
@IBOutlet weak var vipCollectionView: UICollectionView!
var hostedMeetingsArray: [String]?
var vipArray: [Attendee]?
UICollectionViewDelegate
,UICollectionViewDataSource
, andUICollectionViewDelegateFlowLayout
. The last of these I have declared at the top of the class and nothing more. - Declan McKenna