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View allocate twice in VStack within a NavigationView

Forums > SwiftUI

I'm pretty sure it's a long existing SwiftUI bug. The minum reproducable code is here, If we replace VStack with LazyVStack, it only prints once. It only happens to a VStack inside a NavigationView sits in TabView though.

import SwiftUI
import UIKit

struct ContentView: View {
    var body: some View {

    TabView {
      NavigationView {
        VStack {
          Text("1")
            .onAppear {
              print("Appear")
            }
          Divider()
        }
        .background(Color.red)
      }
      .tabItem {
        Label("Menu", systemImage: "list.dash")
      }
      Text("2")
      .tabItem {
        Label("Order", systemImage: "square.and.pencil")
      }
    }
  }
}

   

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