尝试UICollectionView
使用创建compositionalLayout
。它适用于集合视图单元格,但是当我尝试添加标头时,它崩溃并显示寄存器笔尖错误:
由于未捕获的异常“ NSInternalInconsistencyException”而终止应用程序,原因:“无法使种类的视图出列:具有标识符headerView的SectionHeaderElementKind-必须为标识符注册一个笔尖或一个类,或者在情节提要中连接原型单元格”
View Controller的代码实现:
class ViewController: UIViewController {
@IBOutlet weak var collectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
collectionView.register(UINib(nibName: "CollectionReusableView", bundle: nil), forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "headerView")
collectionView.register(UINib(nibName: "CollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "cellIdentifier")
collectionView.collectionViewLayout = customLayout()
}
func customLayout() -> UICollectionViewLayout {
let size = NSCollectionLayoutSize(
widthDimension: NSCollectionLayoutDimension.fractionalWidth(1),
heightDimension: NSCollectionLayoutDimension.estimated(44)
)
let item = NSCollectionLayoutItem(layoutSize: size)
let group = NSCollectionLayoutGroup.horizontal(layoutSize: size, subitem: item, count: 1)
let headerSize = NSCollectionLayoutSize(
widthDimension: .fractionalWidth(1.0),
heightDimension: .absolute(40)
)
let sectionHeader = NSCollectionLayoutBoundarySupplementaryItem(
layoutSize: headerSize,
elementKind: "SectionHeaderElementKind",
alignment: .top
)
let section = NSCollectionLayoutSection(group: group)
section.boundarySupplementaryItems = [sectionHeader]
let layout = UICollectionViewCompositionalLayout(section: section)
return layout
}
}
extension ViewController: UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 5
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellIdentifier", for: indexPath) as! CollectionViewCell
return cell
}
func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
let cell = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "headerView", for: indexPath) as! CollectionReusableView
return cell
}
}
我创建的标题视图:
class CollectionReusableView: UICollectionReusableView {
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
}
如果我在这里缺少东西,请帮助。
在构建布局并将可重用视图注册到集合视图时,都应为元素种类使用相同的值。
更改此:
collectionView.register(UINib(nibName: "CollectionReusableView", bundle: nil), forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "headerView")
至
collectionView.register(UINib(nibName: "CollectionReusableView", bundle: nil), forSupplementaryViewOfKind: "SectionHeaderElementKind", withReuseIdentifier: "headerView")
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