在 iOS 13 上,我们为 tableView 和 collectionView 提供了漂亮的上下文菜单。
我在 UICollectionView 上使用它,如下所示:
'cellForItemAt indexPath' 上的实现:
let interaction = UIContextMenuInteraction(delegate: self)
cell.moreButton.isUserInteractionEnabled = false
cell.moreButton.tag = indexPath.row
cell.addInteraction(interaction)
在“configurationForMenuAtLocation 位置”上处理老虎
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
let configuration = UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { suggestedActions in
var actions = [UIAction]()
for item in self.contextMenuItems {
let action = UIAction(title: item.title, image: item.image, identifier: nil, discoverabilityTitle: nil) { _ in
self.didSelectContextMenu(index: 0) <== how pass the index from here?
}
actions.append(action)
}
let cancel = UIAction(title: "Cancel", attributes: .destructive) { _ in}
actions.append(cancel)
return UIMenu(title: "", children: actions)
}
return configuration
}
问题是我应该如何知道这个菜单触发了 collectionView 的哪个索引?
最佳答案
好的,我找到了解决方案!
我应该使用“contextMenuConfigurationForItemAt”而不是“configurationForMenuAtLocation”。
像这样:
@available(iOS 13.0, *)
func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
return UIContextMenuConfiguration(identifier: nil, previewProvider: nil, actionProvider: { suggestedActions in
return self.makeContextMenu(for: indexPath.row)
})
}
然后使用这个:
@available(iOS 13.0, *)
func makeContextMenu(for index:Int) -> UIMenu {
var actions = [UIAction]()
for item in self.contextMenuItems {
let action = UIAction(title: item.title, image: item.image, identifier: nil, discoverabilityTitle: nil) { _ in
self.didSelectContextMenu(menuIndex: item.index, cellIndex: index) // Here I have both cell index & context menu item index
}
actions.append(action)
}
let cancel = UIAction(title: "Cancel", attributes: .destructive) { _ in}
actions.append(cancel)
return UIMenu(title: "", children: actions)
}
这是我的上下文菜单项:
let contextMenuItems = [
ContextMenuItem(title: "Edit", image: IMAGE, index: 0),
ContextMenuItem(title: "Remove", image: IMAGE, index: 1),
ContextMenuItem(title: "Promote", image: IMAGE, index: 2)
]
这是我的 ContextMenuItem:
struct ContextMenuItem {
var title = ""
var image = UIImage()
var index = 0
}
关于swift - 如何知道在(iOS 13+)configurationForMenuAtLocation 上为上下文菜单触发了哪个 UICollectionView 单元格,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61158026/