swiftui - 在swiftUI中按下TapBarItem时如何滚动到更大的NavigationTitle？

Question

我构建了一个简单的应用程序，它有两个 tapBarItem [主页和设置视图]。

在 home tapBarItem 中有带有 id 的颜色列表，当滚动到底部并按 home tapBarItem 然后它会自动滚动到列表中的第一个颜色。我想要实现的是能够滚动到更大的 NavigationTitle。如果您知道如何实现它，请告诉我[就像点击状态栏一样]。

这是代码：

import SwiftUI

struct ContentView: View {
    @State private var scrollToTop = false
    @State private var selection = 0
    @State private var colors: [CustomColor] = [
        CustomColor(id: 1, color: .red),
        CustomColor(id: 2, color: .green),
        CustomColor(id: 3, color: .blue),
        CustomColor(id: 4, color: .orange),
        CustomColor(id: 5, color: .purple),
        CustomColor(id: 6, color: .yellow),
        CustomColor(id: 7, color: .gray),
        CustomColor(id: 8, color: .black)
    ]
    
    var handler: Binding<Int> {
        Binding(
            get: { selection },
            set: {
            if $0 == selection {
                scrollToTop.toggle()
            }
            selection = $0
        }
        )}
    
    var body: some View {
        TabView(selection: handler) {
            NavigationView {
                ZStack {
                    ScrollView {
                        ScrollViewReader { reader in
                            VStack(spacing: 20) {
                                ForEach(colors) { item in
                                    item.color
//                                        .tag(item.id)
                                        .onChange(of: scrollToTop) { isTop in
                                            if isTop {
                                                withAnimation(.spring(response: 0.3)) {
                                                    reader.scrollTo(item.id - 1, anchor: .top)
                                                }
                                            }
                                        }
                                        .frame(
                                            minWidth: 200,
                                            idealWidth: 200,
                                            maxWidth: .infinity,
                                            minHeight: 300,
                                            idealHeight: 500,
                                            maxHeight: .infinity,
                                            alignment: .center
                                        )
                                }
                            }
                            .padding([.bottom], 20)
                        }
                    }
                }
                .navigationBarTitle(Text("Feed"))
            }
            .tabItem {
                Image(systemName: "house")
                    .font(.title)
            }
            .tag(0)
            
            Text("Second View")
            .tabItem {
                Image(systemName: "gearshape.2")
                    .font(.title)
            }
            .tag(1)
        }
        .accentColor(.black)
    }
}

struct CustomColor: Identifiable {
    let id: Int
    let color: Color
}

标签： swiftuiswiftui-navigationview