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I want to show banner like this:
My approach is adding a CollectionView as a TableViewHeader
My code:
extension HomeViewController: UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func configureHeaderView() {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
layout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
let headerView = UICollectionView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: headerHeight), collectionViewLayout: layout)
headerView.backgroundColor = .blue
headerView.isPagingEnabled = true
headerView.isUserInteractionEnabled = true
headerView.dataSource = self
headerView.delegate = self
headerView.register(BannerCollectionViewCell.self, forCellWithReuseIdentifier: BannerCollectionViewCell.reuseIdentifier)
headerView.showsHorizontalScrollIndicator = false
tableView.tableHeaderView = headerView
}
// MARK: UICollectionViewDataSource
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: BannerCollectionViewCell.reuseIdentifier, for: indexPath) as! BannerCollectionViewCell
return cell
}
// MARK: UICollectionViewDelegateFlowLayout
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: UIScreen.main.bounds.width, height: headerHeight)
}
}
My BannerCollectionViewCell has a default image.
class BannerCollectionViewCell: UICollectionViewCell {
@IBOutlet weak var bannerImageView: UIImageView!
}
But I don't see that image on my header. It just show an empty header.
320
There are no section headers in the UICollectionView. So for your first task, you'll add a new section header using the search text as the section title. To display this section header, you'll use UICollectionReusableView .
Remember, before you make a decision consider if it is just a straight-up list of things with no designs or anything like that, use a TableView. Then if you want more customizability with each cells, like a frame for a portrait, use a CollectionView.
When would you choose to use a collection view rather than a table view? Suggested approach: Collection views are there to display grids, but also handle entirely custom layouts, whereas table views are simple linear lists with headers and footers.
You need to implement a custom UICollectionViewLayout. With a horizontal flow layout it's going to fill from top to bottom first, then move to the right. Since you have two rows, as specified in sizeForItemAt, section 0 will fill from top to bottom, then right to left, and so will section 1.
you use the NIB, so you should use func register(UINib?, forCellWithReuseIdentifier: String) instead of func register(AnyClass?, forCellWithReuseIdentifier: String)
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