介紹
- WWDC 2019 推出了上下文菜單(Context Menus)成為 3DTouch 的替代品。
- 需要通過長按方式觸發。
- 如果要啟用上下文菜單,需要建立一個 UIContextMenuInteraction 并将其添加給某個觸發的 UIView,然後指定 delegate,實作代理方法。
- 代理方法需要傳回一個
,其構造函數如下UIContextMenuConfiguration
,最主要是第三個參數,需要在其中建立init(identifier: NSCopying?, previewProvider: UIContextMenuContentPreviewProvider?, actionProvider: UIContextMenuActionProvider? = nil)
。UIMenu
- 案例
class ViewController: UIViewController {
// 需要打開User Interaction
@IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// 建立UIContextMenuInteraction
let interaction = UIContextMenuInteraction(delegate: self)
// 添加UIContextMenuInteraction
imageView.addInteraction(interaction)
}
}
// 代理方法
extension ViewController: UIContextMenuInteractionDelegate {
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
// 第一個菜單
let favorite = UIAction(title: "Favorite", image: UIImage(systemName: "heart.fill")) { action in
print("favorite")
}
// 第二個菜單
let share = UIAction(title: "Share", image: UIImage(systemName: "square.and.arrow.up.fill")) { action in
print("share")
}
// 第三個菜單
let delete = UIAction(title: "Delete", image: UIImage(systemName: "trash.fill"), attributes: [.destructive]) { action in
print("delete")
}
// 傳回UIContextMenuConfiguration
return UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { _ in
UIMenu(title: "Actions", children: [favorite, share, delete])
}
}
}
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- 效果
效果
UITableView和UICollectionView
iOS 13 以後,UITableView 和 UICollectionView 也支援 Context Menus,使用起來特别簡單,隻需要實作相應的代理方法,傳回
UIContextMenuConfiguration
即可。
- UITableView
func tableView(_ tableView: UITableView, contextMenuConfigurationForRowAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
// 第一個
let favorite = UIAction(title: "Favorite", image: UIImage(systemName: "heart.fill")) { action in
print("favorite")
}
let share = UIAction(title: "Share", image: UIImage(systemName: "square.and.arrow.up.fill")) { action in
print("share")
}
let delete = UIAction(title: "Delete", image: UIImage(systemName: "trash.fill"), attributes: [.destructive]) { action in
print("delete")
}
return UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { _ in
UIMenu(title: "Actions", children: [favorite, share, delete])
}
}
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- UICollectionView
func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
// 第一個
let favorite = UIAction(title: "Favorite", image: UIImage(systemName: "heart.fill")) { action in
print("favorite")
}
let share = UIAction(title: "Share", image: UIImage(systemName: "square.and.arrow.up.fill")) { action in
print("share")
}
let delete = UIAction(title: "Delete", image: UIImage(systemName: "trash.fill"), attributes: [.destructive]) { action in
print("delete")
}
return UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { _ in
UIMenu(title: "Actions", children: [favorite, share, delete])
}
}
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