Here I share my simple implementation! The .h file: /** * CollectionViewLayout for an horizontal flow type: * * | 0 1 | 6 7 | * | 2 3 | 8 9 | —-> etc… * | 4 5 | 10 11 | * * Only supports 1 section and no headers, footers or … Read more
At last, I found an answer for my question. I have missed something. Anyway sorry for other fellow users. I set the header height and width inside the below method till now as @san said. – (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath But It is not the correct method to set the frame size … Read more
The class only tells you about the highlight state, but doesn’t change the visual appearance. You’ll have to do it programmatically by e.g. changing the background of the cell. Details are described in the CollectionView Programming Guide.
I had to do something like this, but needed all the cells in the one section. It was pretty simple to extend UICollectionViewFlowLayout to center cells. I made a pod: https://github.com/keighl/KTCenterFlowLayout
Having the same issue. This worked for me: override func viewDidLoad() { if #available(iOS 11.0, *) { collectionView?.contentInsetAdjustmentBehavior = .always } } The documentation for the .always enum case says: Always include the safe area insets in the content adjustment. This solution works correctly also in the case the phone is rotated.
I ran into the same issue just now. When using the UICollectionViewFlowLayoutDelegate method to set the cell size depending on device and device-orientation, the size would be calculated properly but subviews would not resize to fill the newly size cell. The effect was a large blank cell with small subviews that don’t fill the cell’s … Read more
You can also use (the lazy way) collectionView.collectionViewLayout.invalidateLayout() // swift [[_collectionView collectionViewLayout] invalidateLayout] // objc More complex would be to provide a context collectionView.collectionViewLayout.invalidateLayout(with: context) // swift [[_collectionView collectionViewLayout] invalidateLayoutWithContext:context] // objc You can then make a or configure the context yourself to inform about what should be updated see: UICollectionViewLayoutInvalidationContext It has a function … Read more
It looks like it still retains it’s 100x100px basic size for the contentView while the cell itself gets the right size already. You can force the layout to reset adding the following line just before you return the cell: cell?.layoutIfNeeded()
In swift like below Register Header View collectionView.register(HeaderView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: “headerView”) In UICollectionViewDataSource func collectionView(collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, atIndexPath indexPath: NSIndexPath) -> UICollectionReusableView { let headerView = collectionView.dequeueReusableSupplementaryViewOfKind(UICollectionElementKindSectionHeader, withReuseIdentifier: “headerView”, forIndexPath: indexPath) headerView.frame.size.height = 100 return headerView } Important is that you are supply the flow layout with the header size flowLayout.headerReferenceSize = … Read more
You could check – numberOfSections – numberOfItemsInSection: of your UICollectionViewDataSource to see if your indexPath is a valid one. E.g. extension UICollectionView { func isValid(indexPath: IndexPath) -> Bool { guard indexPath.section < numberOfSections, indexPath.row < numberOfItems(inSection: indexPath.section) else { return false } return true } }