Navigation with data loading

NavigationWithDelay.swift

import SwiftUI

struct ContentView: View {
  @State var loadedContent: String?

  var isActive: Binding<Bool> {
    Binding(
      get: { loadedContent != nil },
      set: { _ in loadedContent = nil }
    )
  }

  var body: some View {
    NavigationView {
      VStack {
        Text("Original content view")
        Text("Tap me to see the second screen")
          .onTapGesture {
            // Start some animation
            // ...

            // Simulate loading
            DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
              // Stop animation
              // ..

              // Use loaded content
              self.loadedContent = "Loaded content"
            }
          }
      }
      .padding()
      .navigationTitle("Root view")
      .background(
        NavigationLink(
          destination: InnerContentView(content: loadedContent ?? ""),
          isActive: isActive
        ) {
          EmptyView()
        }
      )
    }
  }
}

struct InnerContentView: View {
  var content: String

  var body: some View {
    Text("Inner content view: \(content)")
          .navigationTitle("Details view")
  }
}

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