View onAppear example.

OnAppearExample.swift

//
//  MRE.swift
//
//  Created by VAndrJ on 5/7/25.
//

import SwiftUI

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

    var body: some View {
        NavigationStack {
            NavigationLink("Open example", value: 1)
                .navigationDestination(for: Int.self) { _ in
                    ExampleContainerScreen()
                }
        }
    }
}

 struct ExampleContainerScreen: View {
     @State private var text = "1"

     var body: some View {
         VStack {
             Button("Add text") {
                 text += "1"
             }
             OnAppearExampleView(title: text)
         }
     }
 }

 struct OnAppearExampleView: View {
     let title: String

     @State private var count = 0

     init(title: String) {
         self.title = title

         print(Self.self, #function, title)
     }

     var body: some View {
         let _ = Self._printChanges()
         VStack {
             Text(title)
                 .font(.title)
             Button("Increment") {
                 count += 1
             }
             Text("\(count)")
             Text("onAppear should only be called when the View representation on the screen is about to appear, not when the View struct is initialized / re-initialized / body re-evaluated.")
         }
         .onAppear {
             print(Self.self, "onAppear")
         }
     }
 }