如何在這兩個列表之間導航？

Question

我正在做一個測試項目。 我的目標是能夠從HomeList導航到SampleDataList ，然后導航到基於 URL 文件類型的一些不同視圖。 我不想使用 Master/Detail。

使用下面給出的代碼，我收到以下錯誤：

Note: Links search for destinations in any surrounding NavigationStack, then within the same column of a NavigationSplitView. A NavigationLink is presenting a value of type "URL" but there is no matching navigationDestination declaration visible from the location of the link. The link cannot be activated.

我努力了...

• 移動navigationDestination(for:destination:)到HomeList 。 這是行不通的。
• 在NavigationStack中嵌入SampleDataList 。 這也不管用。
• 使用NavigationPath 。 我不確定我這樣做是否正確，但它也沒有用。

---

    struct HomeList: View {
        
        var body: some View {
            NavigationStack {
                List {
                    NavigationLink {
                        SampleDataList()
                    } label: {
                        Text("Sample Data Picker")
                    }
                }
            }
        }
    }

    extension URL: Identifiable {
        
        public var id: Int { self.hashValue }
        
    }

    struct SampleDataList: View {
        
        var urls: [URL] {
            let path = Bundle.main.resourcePath!
            let url = URL(fileURLWithPath: path).appendingPathComponent("SampleData")
            return try! FileManager.default.contentsOfDirectory(at: url, includingPropertiesForKeys: nil)
        }
        
        var body: some View {
            List(urls) { url in
                NavigationLink(value: url) {
                    Text("\(url.lastPathComponent)")
                }
            }
            .listStyle(PlainListStyle())
            .navigationDestination(for: URL.self) { url in
                Text("\(url.lastPathComponent)")
            }
        }
    }

Answer 1

我想出了一個使用NavigationPath的解決方案。 我向HomeList添加了一個導航路徑，並使用枚舉和navigationDestination(for:destination:)來導航我的 static 列表...

struct HomeList: View {
    
    @State var path = NavigationPath()
    
    enum HomeListOptions: String, CaseIterable {
        case sampleDataPicker = "Sample Data Picker"
        // TODO: Add more cases here
    }

    var body: some View {
        NavigationStack(path: $path) {
            List(HomeListOptions.allCases, id: \.self) { option in
                NavigationLink(option.rawValue, value: option)
            }
            .navigationDestination(for: HomeListOptions.self) { option in
                switch option {
                case .sampleDataPicker:
                    SampleDataList()
                }
            }
        }
    }
}

我保持我的SampleDataList不變。 它使用處理 URL 的navigationDestination(for:destination:) )...

struct SampleDataList: View {
            
    var urls: [URL] {
        let path = Bundle.main.resourcePath!
        let url = URL(fileURLWithPath: path).appendingPathComponent("SampleData")
        return try! FileManager.default.contentsOfDirectory(at: url, includingPropertiesForKeys: nil)
    }
    
    var body: some View {
        List(urls) { url in
            NavigationLink(value: url) {
                Text("\(url.lastPathComponent)")
            }
        }
        .listStyle(PlainListStyle())
        .navigationDestination(for: URL.self) { url in
            Text("\(url.lastPathComponent)")
        }
    }
}