SwiftUI，如何实现跳转到导航的根视图

直接上代码：

文件1：NavManager.swift

import Foundation

let NAVM = NavManager.shared

// 观察者模式
class NavManager: ObservableObject {
    @Published var toRoot: Bool = false
        
    // MARK: - Singleton Instance
    static let shared = NavManager()
    
    private init() {
    }
}

文件2：NavBackDemo.swift

import SwiftUI

struct ContentViewA: View {
    @State private var isNavPush = false
    @ObservedObject private var navm = NAVM
    
    var body: some View {
        VStack {
            NavigationLink(isActive: $isNavPush) {
                ContentViewB()
            } label: {
                Button {
                    isNavPush = true
                } label: {
                    Text("导航跳转")
                }
            }
        }
        .navigationBarTitle("ContentViewA", displayMode: .inline)
        // 这里是关键
        .onChange(of: navm.toRoot) { value in
            if value {
                isNavPush = false
                navm.toRoot = false
            }
        }
    }
}

struct ContentViewB: View {
    @State var isNavPush = false
    
    var body: some View {
        VStack {
            NavigationLink(isActive: $isNavPush) {
                ContentViewC()
            } label: {
                Button {
                    isNavPush = true
                } label: {
                    Text("导航跳转")
                }
            }
        }
        .navigationBarTitle("ContentViewB", displayMode: .inline)
    }
}

struct ContentViewC: View {
    @State var isNavPush = false
    
    var body: some View {
        VStack {
            NavigationLink(isActive: $isNavPush) {
                ContentViewD()
            } label: {
                Button {
                    isNavPush = true
                } label: {
                    Text("导航跳转")
                }
            }
        }
        .navigationBarTitle("ContentViewC", displayMode: .inline)
    }
}

struct ContentViewD: View {
    @ObservedObject private var navm = NAVM
    
    var body: some View {
        VStack {
            Button {
                navm.toRoot = true
            } label: {
                Text("返回根目录")
            }
        }
        .navigationBarTitle("ContentViewD", displayMode: .inline)
    }
}

#Preview {
    NavigationView {
        ContentViewA()
    }
}