SwiftUI 3 MacOs Table单选并双击打开工作表

Question

import SwiftUI

struct ContentView: View {
    
    @State private var items: [ItemModel] = Array(0...100).map { ItemModel(id: $0, title: "item \($0)", age: $0) }
    @State private var selection = Set<ItemModel.ID>()
    @State private var sorting = [KeyPathComparator(\ItemModel.age)]
    
    var body: some View {
        Table(items, selection: $selection, sortOrder: $sorting) {
            TableColumn("id", value: \.id) { Text("\($0.id)") }
            TableColumn("title", value: \.title)
            TableColumn("age", value: \.age) { Text("\($0.age)") }
        }
        .onChange(of: sorting) {
            items.sort(using: $0)
        }
        .font(.caption)
        .frame(width: 960, height: 540)
    }
}

struct ItemModel: Identifiable {
    var id: Int
    var title: String
    var age: Int
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

这是一个在 Model.age 上排序的表格的工作示例，并且支持多项选择，我想要单选并双击一行打开工作表，这可能吗？另外我如何获取所选项目对象？

谢谢

Answer 1

关于双击表格行：Apple 在 WWDC 2022 上使用 SwiftUI 4 引入了新的上下文菜单修饰符contextMenu(forSelectionType:menu:primaryAction:)。这样，primaryAction可以提供当用户双击一行时执行的Table操作。

@State private var selection: ItemModel.ID?

var body: some View {
    Table(items, selection: $selection, sortOrder: $sortOrder) {
        TableColumn("id", value: \.id)
        TableColumn("title", value: \.title)
        TableColumn("age", value: \.age)
    }
    .contextMenu(forSelectionType: ItemModel.ID.self) { items in
        // ...
    } primaryAction: { items in
        // This is executed when the row is double clicked
    }
}

Answer 2

您必须更改Set<Value.ID>为Value.ID仅一行选择，并TapGesture在文本中进行。

@State private var selection = Set<ItemModel.ID>() // <-- Use this for multiple rows selections

@State private var selection : ItemModel.ID? // <--- Use this for only one row selection

struct ContentView: View {
    
    @State private var items: [ItemModel] = Array(0...100).map { ItemModel(id: $0, title: "item \($0)", age: $0) }
    //@State private var selection = Set<ItemModel.ID>() <-- Use this for multiple rows selections
    @State private var selection : ItemModel.ID? // <--- Use this for only one row selection
    @State private var sorting = [KeyPathComparator(\ItemModel.age)]
    @State private var showRow = false
    
    var editRow: some View {
        VStack {
            Text(items[selection!].title)
                .font(.title)
            Text("Selected: \(selection.debugDescription)")
             Button("Dismiss") {
                showRow.toggle()
             }.padding()
        }
        .frame(minWidth:400, minHeight: 400)
    }
    
    var body: some View {
        VStack {
            Table(items, selection: $selection, sortOrder: $sorting) {
                TableColumn("id", value: \.id) {
                    Text("\($0.id)")
                        .onTapGesture(count: 2, perform: {
                            if selection != nil {
                                showRow.toggle()
                            }
                        })
                }
                TableColumn("title") { itemModel in
                    Text(itemModel.title)
                        .onTapGesture(count: 2, perform: {
                            if selection != nil {
                                showRow.toggle()
                            }
                        })
                }
                TableColumn("age", value: \.age) { Text("\($0.age)") }
            }
            .onChange(of: sorting) {
                items.sort(using: $0)
            }
            .font(.caption)
            .frame(width: 960, height: 540)
        }
        .sheet(isPresented: $showRow) {
            editRow
        }
    }
}