列表中使用的多个 NavigationLink 在 SwiftUI 中不起作用

Question

我正在关注 Apple 的 SwiftUI 教程，在“与 UIKit 交互”中，他们让我们制作了图像轮播（地标图像）。当我尝试使用它时，我做到了，当您点击图像时，它会将您带到该图像的详细视图。我还在轮播中的图像下方添加了一个标题，我希望该标题能够在点击时将您带到有关该特定地标的小文章。但是，只有标题将您带到了目的地，而图像没有做任何事情（尽管当您按下它时它会突出显示）。

我不会转储确切的代码，但我已经制作了一个简化版本，它具有相同的设置并传达了我的观点。我将添加 cmets 以使其不那么繁琐。

struct ContentView: View {
    @State var currentPage = 0  // Tracks page number of the Carousel.

    var body: some View {
        NavigationView {
            List {
                Carousel(currentPage: $currentPage)
                    .listRowInsets(EdgeInsets())

                Text("Page number: \(currentPage + 1)")  // Displays page number of Carousel.
            }
        }
    }
}

struct Carousel: View {
    @Binding var currentPage: Int

    var body: some View {
       VStack {
            PageView([Photo(), Photo()], currentPage: $currentPage)  // This is a view from the Apple Tutorial. I'll link it incase you want to check out the code for this.
                .equatable()  // This allows the Text which shows the page number to work. I've made the '==' operator to always return true for the sake of simplicity.
                .frame(height: 350)

            NavigationLink(destination: Text("Write-up about landmark")) {
                Text("\"Captions...\"")  // This changes in the real app depending on the page number. This NavigationLink always works and takes me to the correct page.
                    .font(.headline)
                    .padding(.bottom, 10)
            }
            .padding(.trailing)
        }
    }
}

struct Photo: View {
    var body: some View {
        NavigationLink(destination: Text("Landmark Detail")) {  // This NavigationLink doesn't work. It highlights when pressed down on, but doesn't take you anywhere.
            Image(systemName: "person")  // These are the respective landmarks in the real app.
                .resizable()
                .aspectRatio(contentMode: .fill)
                .frame(width: UIScreen.screenWidth)  // Custom static property. It's equal to UIScreen.main.bounds.size.width
        }
    }
}

链接到 PageView 结构：https://developer.apple.com/tutorials/swiftui/interfacing-with-uikit#create-view-to-represent-a-uipageviewcontroller（第 3 节第 3 步）
（注意：由于我在 ContentView 中跟踪 currentPage 变量而不是 PageView，所以 @987654328 PageView 中的 @ 变量在我的代码中是 Binding 而不是 State）

如果有人可以解释我如何使 NavigationLink 工作，请告诉我。 如果你懒得写代码，你可以解释一下如何做，我会从那里弄清楚。

提前致谢！

Answer 1

该链接进入不同的视图层次结构，因此 NavigationView 看不到它。这是可能的解决方案（未经测试 - 粗糙）。

1) 在 Photo 内部传递回调操作

struct Photo: View {
    let action: () -> Void
    var body: some View {
        Button(action: action) {
            Image(systemName: "person")
                .resizable()
                .aspectRatio(contentMode: .fill)
                .frame(width: UIScreen.screenWidth)
        }
    }
}

2) 将来自Carousel 的回调操作注入Photo

struct Carousel: View {
    @Binding var currentPage: Int

    @State private var photoActivated = false // for in-code activation
    var body: some View {
       VStack {
            PageView([Photo(action: activateLink), Photo(action: activateLink)], currentPage: $currentPage)  // This is a view from the Apple Tutorial. I'll link it incase you want to check out the code for this.
                .equatable()  // This allows the Text which shows the page number to work. I've made the '==' operator to always return true for the sake of simplicity.
                .frame(height: 350)
                .background(
                    // hidden, to be activated by injected action
                    NavigationLink(destination: Text("Landmark Detail \(currentPage)"),
                        isActive: $photoActivated) { EmptyView() })

            NavigationLink(destination: Text("Write-up about landmark")) {
                Text("\"Captions...\"")  // This changes in the real app depending on the page number. This NavigationLink always works and takes me to the correct page.
                    .font(.headline)
                    .padding(.bottom, 10)
            }
            .padding(.trailing)
        }
    }

    private func activateLink() {
        self.photoActivated.toggle()
    }
}