onAppear is called when the view hasn't appeared

• This only appears on actual devices, in the simulator, the issue does not appear.

• The issue only appears with projects created with the SwiftUI App Life Cycle. The issue does not appear in projects with the UI Kit App Delegate Life Cycle projects.

Code Block swift
import SwiftUI
struct ContentView: View {
		var body: some View {
		TabView {
			AgendaView()
				.tabItem {
					Image(systemName: "list.bullet")
					Text("Agenda")
				}
			HealthView()
				.tabItem {
					Image(systemName: "heart")
					Text("Health")
				}
			SettingsView()
				.tabItem {
					Image(systemName: "gear")
					Text("Settings")
				}
		}
		}
}
struct AgendaView: View {
	var body: some View {
		VStack {
			Text("Hello, AgendaView!")
		}.onAppear{
			print("AgendaView.onAppear")
		}.onDisappear(){
			print("AgendaView.onDisappear")
		}
	}
}
struct HealthView: View {
	var body: some View {
		VStack {
			Text("Hello, HealthView!")
		}.onAppear{
			print("HealthView.onAppear")
		}.onDisappear(){
			print("HealthView.onDisappear")
		}
	}
}
struct SettingsView: View {
	var body: some View {
		VStack {
			Text("Hello, SettingsView!")
		}.onAppear{
			print("SettingsView.onAppear")
		}.onDisappear(){
			print("SettingsView.onDisappear")
		}
	}
}

Code Block 
import SwiftUI
struct HomeTabbedView: View {
    var body: some View {
        TabView {
            RehearsalsView()
                .tabItem {
                    Image(systemName: "calendar.circle.fill")
                    Text("Rehearsals")
                }
            ProfileWrapperView()
                .tabItem {
                    Image(systemName: "person.crop.circle.fill")
                    Text("User Profile")
                }
        }
    }
}

Code Block 
import SwiftUI
struct ProfileWrapperView: View {
    @EnvironmentObject var portal: Portal
    @State var draftAdult: Adult = Adult.default
    
    var body: some View {
        if (portal.adult) != nil {
            ProfileEditView(adult: $draftAdult)
                .onAppear {
                    self.draftAdult = self.portal.adult!
                    print("ProfileEditView appearing")
                }
                .onDisappear {
                    self.portal.adult! = self.draftAdult
                    print("ProfileEditView disappearing")
                }
        } else {
            Text("No adult data found.")
        }
    }
}

I am seeing the same issue with Xcode 12.4 + Deployment target macOS 10.15

I am seeing this issue too on: iOS 14.6 Xcode 12.5 macOS 11.4

Xcode 12.5.1, iOS 14.5: the bug is there for me too

Any chance of this being fixed apple?

.onAppear and .onDisappear just don't run for me in Xcode 13 beta 5. If I remove the TabView and have a single page then they work fine.

Any update about this issue?

Seems the bug is fixed in Xcode 13.2 beta (13C5066c) and iOS 15.2.

In my app I use three tabs. My app starts with tab 0. If I go to tab 1, the on onAppear-Method gets called. Last, I go to tab 2 but the onAppear-Method gets called twice. But the method should only called once.

I managed to work it around by adding viewDidAppear callback to SwiftUI, and replacing onAppear callbacks with it.

The code: https://gist.github.com/alongotv/7f450e8c47ed3f057e1f6d35443af269

Usage: apply onDidAppear modifier instead of onAppear to those views you use in TabView.

A rough example:

struct RootView: View {
    @State var selection: Int = 1

    var body: some View {
        TabView(selection: $selection) {
            FirstTabView().tag(1)
            SecondTabView().tag(2)
        }
    }
}

struct FirstTabView: View {

    var body: some View {
        Text("first tab view")
            .onDidAppear {
                // load data
            }
    }
}

struct SecondTabView: View {

    var body: some View {
        Text("second tab view")
            .onDidAppear {
                // load data
            }
    }
}

Hope this helps.

Problems are still there, XCode 12.5 & iOS 14.5 simulator

Issue is still there in XCode 13.2.1 on simulator iOS 15.0.

I'm experimenting this issue in Xcode 14.2 and iOS 16.2...

.onAppear {
      withAnimation(.easeOut(duration: 0.5)) {
        print("IS ANIMATING: \(isAnimating)")
        isAnimating = true
      }
    }

TabView {
      ForEach(0..<5) { item in 
        FruitCardView()
      } //: FOREACH
    } //: TABVIEW
    .tabViewStyle(PageTabViewStyle())
    .padding(.vertical, 20)

That onAppear is for a ZStack. And this is the logs that prove onAppear is called before the item is visible in the TabView...