根据条件判断NavigationLink是否处于活动状态

import SwiftUI

struct ContentView: View {
    @State private var isActive = false

    var body: some View {
        NavigationView {
            VStack {
                Toggle(isOn: $isActive) {
                    Text("Toggle NavigationLink")
                }

                NavigationLink(
                    destination: DetailView(),
                    label: { Text("Go to Detail View") }
                )
                .is_active(isActive) // 根据条件判断是否激活
            }
        }
    }
}

struct DetailView: View {
    var body: some View {
        Text("Detail View")
            .navigationBarTitle("Detail")
    }
}

extension NavigationLink where Label == Text {
    func is_active(_ active: Bool) -> some View {
        self.activationPriority(active ? .required : .disabled)
    }
}

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