Swift，iOS15，UIKit，CollectionView头问题
Swift，iOS15，UIKit，CollectionView头问题
提问于 2021-06-12 08:19:22
我正在测试iOS15和UIKit的一些新功能。我遇到了一些问题，不知道如何解决。，我没有更改代码__。这只是一段与iOS 14完美工作的代码，现在在更新我的目标之后，它会抛出一个错误。
当我的UICollectionView类型UICollectionElementKindSectionHeader的自定义头被返回到dataSource时，Xcode崩溃了。这是我的代码：
private func configureDataSource() {
dataSource = UICollectionViewDiffableDataSource<Section, Follower>(collectionView: collectionView, cellProvider: { (collectionView, indexPath, followers) -> UICollectionViewCell? in
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: FollowerCell.reuseId, for: indexPath) as! FollowerCell
cell.set(on: followers)
return cell
})
dataSource.supplementaryViewProvider = { (collectionView, kind, indexPath) in
let header = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionView.elementKindSectionHeader,
withReuseIdentifier: FollowersCollectionHeaderView.reuseId,
for: indexPath) as! FollowersCollectionHeaderView
header.set(with: self.user)
return header
}
}日志上写着：
从-collectionView:viewForSupplementaryElementOfKind:atIndexPath:返回的视图与它正在使用的元素类型不匹配。当被问到元素类型'FollowersCollectionHeaderView‘的视图时，数据源将为元素类型'UICollectionElementKindSectionHeader’注册的视图去排队。
我确实将UICollectionElementKindSectionHeader抛给了FollowersCollectionHeaderView，，因此我不确定这里的问题是什么。
我已经看过WWDC21 ，UIKit中的新内容，但是还没有看到对特定代码的任何更改。
如果有什么建议，在代码中要修正什么？
回答 2
Stack Overflow用户
回答已采纳
发布于 2021-09-23 19:18:17
这是我想出的部分解决方案。苹果建议使用对象的ID作为collectionView单元格的参考。
enum Section { case main }
var dataSource: UICollectionViewDiffableDataSource<Section, Follower.ID>!
// MARK: - Collection View configurations
fileprivate lazy var collectionView: UICollectionView = {
let collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: UIHelper.createCompositionalLayout())
collectionView.delegate = self
collectionView.backgroundColor = .systemBackground
collectionView.register(FollowersCollectionHeaderView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: FollowersCollectionHeaderView.reuseId)
view.addSubview(collectionView)
return collectionView
}()
fileprivate lazy var snapshot: NSDiffableDataSourceSnapshot<Section, Follower.ID> = {
var snapshot = NSDiffableDataSourceSnapshot<Section, Follower.ID>()
snapshot.appendSections([.main])
let itemIdentifiers = followers.map { $0.id }
snapshot.appendItems(itemIdentifiers, toSection: .main)
dataSource.apply(snapshot, animatingDifferences: true)
return snapshot
}()
fileprivate func updateData(with followers: [Follower]) {
snapshot = NSDiffableDataSourceSnapshot<Section, Follower.ID>()
snapshot.appendSections([.main])
let itemIdentifiers = followers.map { $0.id }
snapshot.appendItems(itemIdentifiers, toSection: .main)
dataSource.apply(snapshot, animatingDifferences: true)
}
fileprivate func configureDataSource() {
let cellRegistration = UICollectionView.CellRegistration<FollowerCell, Follower.ID> { [weak self]
cell, indexPath, followerID in
guard let self = self else { return }
let followerArray = self.followers.filter { $0.id == followerID }
if let follower = followerArray.first {
cell.set(on: follower)
}
}
dataSource = UICollectionViewDiffableDataSource<Section, Follower.ID>(collectionView: collectionView) {
collectionView, indexPath, itemIdentifier in
return collectionView.dequeueConfiguredReusableCell(using: cellRegistration,
for: indexPath,
item: itemIdentifier)
}
let headerRegistration = createSectionHeaderRegistration()
dataSource.supplementaryViewProvider = { collectionView, elementKind, indexPath in
return collectionView.dequeueConfiguredReusableSupplementary(using: headerRegistration, for: indexPath)
}
}
fileprivate func createSectionHeaderRegistration() -> UICollectionView.SupplementaryRegistration<FollowersCollectionHeaderView> {
return UICollectionView.SupplementaryRegistration<FollowersCollectionHeaderView>(
elementKind: FollowersCollectionHeaderView.reuseId) { [weak self] supplementaryView, elementKind, indexPath in
guard let self = self else { return }
supplementaryView.set(with: self.user)
}
}Stack Overflow用户
发布于 2022-08-16 03:43:30
使用UICollectionView.elementKindSectionHeader代替创建的字符串
override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
guard let header = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "headerView", for: indexPath) as? TitleDetailsHeaderView else { return UICollectionReusableView() }
return header
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/67946954
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