tvOS上的SwiftUI：如何知道在列表中选择了哪个项目

在列表中，我需要知道选择了哪个项目，并且该项目必须可以单击

这就是我试图做的：

| item1 | info of the item3 (selected) |
| item2 |                              |
|*item3*|                              |
| item4 |                              |

我可以使用

.focusable（）

来创建它，但它不可单击

按钮

或

导航链接

起作用，但我无法选择当前项目

当您使用

按钮

或

导航链接

.focusable

时，不要再点击

所以我的问题是：

如何选择当前项目（以便显示有关此项目的更多信息）并使其可单击以显示下一个视图

示例代码1：可聚焦工作，但tvOS上不存在

.onTap

import SwiftUI

struct TestList: Identifiable {
    var id: Int
    var name: String
}

let testData = [Int](0..<50).map { TestList(id: $0, name: "Row \($0)")  }


struct SwiftUIView : View {
    var testList: [TestList]

    var body: some View {
        List {
            ForEach(testList) { txt in
                TestRow(row: txt)
            }
        }
    }
}

struct TestRow: View {
    var row: TestList

    @State private var backgroundColor = Color.clear

    var body: some View {
        Text(row.name)
        .focusable(true) { isFocused in
            self.backgroundColor = isFocused ? Color.green : Color.blue
            if isFocused {
                print(self.row.name)
            }
        }
        .background(self.backgroundColor)
    }
}

---

对我来说，这似乎是一个主要的网站，你不能在tvos的swiftui中附加一个点击事件。我想出了一个方法，让你可以选择和点击大多数swiftui组件。希望能有帮助

首先，我需要创建一个捕获事件的UIView

    class ClickableHackView: UIView {
        weak var delegate: ClickableHackDelegate?

        override init(frame: CGRect) {
            super.init(frame: frame)        
        }

        override func pressesEnded(_ presses: Set<UIPress>, with event: UIPressesEvent?) {
            if event?.allPresses.map({ $0.type }).contains(.select) ?? false {
                delegate?.clicked()
            } else {
                superview?.pressesEnded(presses, with: event)
            }
        }

        override func didUpdateFocus(in context: UIFocusUpdateContext, with coordinator: UIFocusAnimationCoordinator) {
            delegate?.focus(focused: isFocused)
        }

        required init?(coder: NSCoder) {
            fatalError("init(coder:) has not been implemented")
        }

        override var canBecomeFocused: Bool {
            return true
        }
    }

然后为我的视图做一个快捷界面扩展

struct ClickableHack: UIViewRepresentable {
    @Binding var focused: Bool
    let onClick: () -> Void

    func makeUIView(context: UIViewRepresentableContext<ClickableHack>) -> UIView {
        let clickableView = ClickableHackView()
        clickableView.delegate = context.coordinator
        return clickableView
    }

    func updateUIView(_ uiView: UIView, context: UIViewRepresentableContext<ClickableHack>) {
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator(self)
    }

    class Coordinator: NSObject, ClickableHackDelegate {
        private let control: ClickableHack

        init(_ control: ClickableHack) {
            self.control = control
            super.init()
        }

        func focus(focused: Bool) {
            control.focused = focused
        }

        func clicked() {
            control.onClick()
        }
    }
}

---

不幸的是，我在tvOS上的自定义按钮样式方面运气不太好

但是，要在tvOS上的SwiftUI中创建可聚焦、可选择的自定义视图，可以将按钮样式设置为“普通”。这允许您在提供目标和自定义布局的同时，保留nice系统提供的焦点和选择动画。只需将

.buttonStyle（PlainButtonStyle（））

修饰符添加到

导航链接中即可：

struct VideoCard: View {
    var body: some View {
        NavigationLink(
            destination: Text("Video player")
        ) {
            VStack(alignment: .leading, spacing: .zero) {
                Image(systemName: "film")
                    .frame(width: 356, height: 200)
                    .background(Color.white)
                Text("Video Title")
                    .foregroundColor(.white)
                    .padding(10)
            }
            .background(Color.primary)
            .frame(maxWidth: 400)
        }
        .buttonStyle(PlainButtonStyle())
    }
}


单击Siri遥控器上的按钮、Enter键或键盘，应该可以正常工作。
请发布一条说明您所描述的问题的信息。感谢您的解决方法，但这太过分了！：）现在，我使用一个常规的UICollectionViewController（在TVOS13上安装了bug）
struct ClickableHack: UIViewRepresentable {
    @Binding var focused: Bool
    let onClick: () -> Void

    func makeUIView(context: UIViewRepresentableContext<ClickableHack>) -> UIView {
        let clickableView = ClickableHackView()
        clickableView.delegate = context.coordinator
        return clickableView
    }

    func updateUIView(_ uiView: UIView, context: UIViewRepresentableContext<ClickableHack>) {
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator(self)
    }

    class Coordinator: NSObject, ClickableHackDelegate {
        private let control: ClickableHack

        init(_ control: ClickableHack) {
            self.control = control
            super.init()
        }

        func focus(focused: Bool) {
            control.focused = focused
        }

        func clicked() {
            control.onClick()
        }
    }
}

struct Clickable<Content>: View where Content : View {
    let focused: Binding<Bool>
    let content: () -> Content
    let onClick: () -> Void

    @inlinable public init(focused: Binding<Bool>, onClick: @escaping () -> Void, @ViewBuilder content: @escaping () -> Content) {
        self.content = content
        self.focused = focused
        self.onClick = onClick
    }

    var body: some View {
        ZStack {
            ClickableHack(focused: focused, onClick: onClick)
            content()
        }
    }
}

struct ClickableTest: View {
    @State var focused1: Bool = false
    @State var focused2: Bool = false

    var body: some View {
        HStack {
            Clickable(focused: self.$focused1, onClick: {
                print("clicked 1")
            }) {
                Text("Clickable 1")
                    .foregroundColor(self.focused1 ? Color.red : Color.black)
            }
            Clickable(focused: self.$focused2, onClick: {
                print("clicked 2")
            }) {
                Text("Clickable 2")
                    .foregroundColor(self.focused2 ? Color.red : Color.black)
            }
        }
    }
}

struct VideoCard: View {
    var body: some View {
        NavigationLink(
            destination: Text("Video player")
        ) {
            VStack(alignment: .leading, spacing: .zero) {
                Image(systemName: "film")
                    .frame(width: 356, height: 200)
                    .background(Color.white)
                Text("Video Title")
                    .foregroundColor(.white)
                    .padding(10)
            }
            .background(Color.primary)
            .frame(maxWidth: 400)
        }
        .buttonStyle(PlainButtonStyle())
    }
}