Когда я создал заголовок раздела, я поместил туда collectionView и хочу, чтобы он прикреплялся к навигационной панели при прокрутке, я сделал это через pinToVisibleBounds. Заголовок прикрепляется, как я хотел, но при прокрутке, проходя через 1 ячейку, он отсоединяется и покидает экран.
Это код для создание заголовка секции.
import UIKit
class SecondSectionHeader: UICollectionReusableView {
@IBOutlet weak var collectionView: UICollectionView!
static let reuseId = "SecondSectionHeader"
fileprivate var sections: [Section] = Bundle.main.decode([Section].self, from: "model.json").filter { section in
return section.type != "Names" && section.type != "Numbers"
}
fileprivate var indexPathOfSelectedCell: IndexPath?
override func awakeFromNib() {
super.awakeFromNib()
configureCollectionView()
}
private func configureCollectionView() {
collectionView.delegate = self
collectionView.dataSource = self
collectionView.register(UINib(nibName: "EmojiCell", bundle: nil), forCellWithReuseIdentifier: EmojiCell.reuseId)
collectionView.layer.shadowOffset = CGSize(width: collectionView.frame.width, height: collectionView.frame.height)
collectionView.backgroundColor = #colorLiteral(red: 0.880524771, green: 0.9031272657, blue: 0.875127862, alpha: 1)
collectionView.alpha = 1
collectionView.reloadData()
}
}
//MARK:- UICollectionViewDataSource
extension SecondSectionHeader: UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
guard let countOfCells = sections.first?.items.count else { return 0 }
return countOfCells
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: EmojiCell.reuseId, for: indexPath) as? EmojiCell else { return UICollectionViewCell()}
guard let item = sections.first?.items[indexPath.item] else { return UICollectionViewCell()}
cell.configureCell(item: item)
return cell
}
}
//MARK:- UICollectionViewDelegate
extension SecondSectionHeader:UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
NotificationCenter.default.post(name: Notification.Name("SelectedIndexPath"), object: nil, userInfo: ["indexPath":indexPath])
if let previousIndex = indexPathOfSelectedCell {
let previousCell = collectionView.cellForItem(at: previousIndex)
previousCell?.backgroundColor = .clear
cell?.backgroundColor = #colorLiteral(red: 0.3647058904, green: 0.06666667014, blue: 0.9686274529, alpha: 1)
} else {
cell?.backgroundColor = #colorLiteral(red: 0.3647058904, green: 0.06666667014, blue: 0.9686274529, alpha: 1)
}
collectionView.scrollToItem(at: indexPath, at: .left, animated: true)
indexPathOfSelectedCell = indexPath
}
}
Код для создания секции с заголовком.
private func createStringSection() -> NSCollectionLayoutSection {
let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .fractionalHeight(1.0))
let item = NSCollectionLayoutItem(layoutSize: itemSize)
let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .fractionalHeight(0.2))
let group = NSCollectionLayoutGroup.vertical(layoutSize: groupSize, subitems: [item])
let section = NSCollectionLayoutSection(group: group)
let sectionBackgroundDecoration = NSCollectionLayoutDecorationItem.background(
elementKind: ViewController.sectionBackgroundDecorationElementKind)
sectionBackgroundDecoration.contentInsets = NSDirectionalEdgeInsets(top: 80, leading: 0, bottom: 0, trailing: 0)
section.decorationItems = [sectionBackgroundDecoration]
let header = createHeader()
section.boundarySupplementaryItems = [header]
sectionBackgroundDecoration.zIndex = 1
print(sectionBackgroundDecoration.zIndex)
print(header.zIndex)
return section
}
Функция, которая создает заголовок.
private func createHeader() -> NSCollectionLayoutBoundarySupplementaryItem {
let headerSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1), heightDimension: .estimated(80))
let header = NSCollectionLayoutBoundarySupplementaryItem(layoutSize: headerSize, elementKind: UICollectionView.elementKindSectionHeader, alignment: .top)
header.pinToVisibleBounds = true
header.zIndex = 2
return header
}
).