Ios 使用UICollectionViewCompositionLayout水平滚动多个部分
是否可以使用Ios 使用UICollectionViewCompositionLayout水平滚动多个部分,ios,uicollectionview,ios13,Ios,Uicollectionview,Ios13,是否可以使用UICollectionViewCompositionLayout创建包含多个部分的水平滚动集合视图 我希望创建一个类似于表情键盘的布局,它有多个部分,每个部分都附加在前一部分的末尾,在一个水平滚动的“组”中,每个部分都有一个标题 使用以下布局,每个部分垂直堆叠,每个部分水平滚动: UICollectionViewCompositionalLayout { (sectionIndex: Int, layoutEnvironment: NSCollection
UICollectionViewCompositionLayout
创建包含多个部分的水平滚动集合视图
我希望创建一个类似于表情键盘的布局,它有多个部分,每个部分都附加在前一部分的末尾,在一个水平滚动的“组”中,每个部分都有一个标题
使用以下布局,每个部分垂直堆叠,每个部分水平滚动:
UICollectionViewCompositionalLayout {
(sectionIndex: Int, layoutEnvironment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection? in
let leadingItem = NSCollectionLayoutItem(
layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(0.7),
heightDimension: .fractionalHeight(1.0)))
leadingItem.contentInsets = NSDirectionalEdgeInsets(top: 10, leading: 10, bottom: 10, trailing: 10)
let trailingItem = NSCollectionLayoutItem(
layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0),
heightDimension: .fractionalHeight(0.3)))
trailingItem.contentInsets = NSDirectionalEdgeInsets(top: 10, leading: 10, bottom: 10, trailing: 10)
let trailingGroup = NSCollectionLayoutGroup.vertical(
layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(0.3),
heightDimension: .fractionalHeight(1.0)),
subitem: trailingItem, count: 2)
let containerGroup = NSCollectionLayoutGroup.horizontal(
layoutSize: NSCollectionLayoutSize(widthDimension: .fractionalWidth(0.85),
heightDimension: .fractionalHeight(0.4)),
subitems: [leadingItem, trailingGroup])
let section = NSCollectionLayoutSection(group: containerGroup)
section.orthogonalScrollingBehavior = .continuous
return section
}
您可以使用以下配置将collectionViewLayout的主滚动方向设置为水平:
let config = UICollectionViewCompositionalLayoutConfiguration()
config.scrollDirection = .horizontal
let sectionProvider = ...(your section provider here)
let cvLayout = UICollectionViewCompositionalLayout(sectionProvider: sectionProvider, configuration: config)
在sectionProvider中,可以创建固定到每个节顶部的标题,如下所示:
let headerSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .estimated(40))
let headerSupplementary = NSCollectionLayoutBoundarySupplementaryItem(
layoutSize: headerSize,
elementKind: UICollectionView.elementKindSectionHeader,
alignment: .topLeading)
section.boundarySupplementaryItems = [headerSupplementary]
此设置应实现您所需的滚动行为。在每个部分中,您可以使用以下组实现与表情键盘相同的网格布局:
let group = NSCollectionLayoutGroup.vertical(layoutSize: groupSize, subitem: item, count: 5)