NavigationPage.TitleView causes memory leak with PopToRootAsync #28201
Description
Description
It seems if I add NavigationPage.TitleView into a ContentPage's XAML, the page will never be destroyed if it's popped from the navigation stack with PopToRootAsync, leading to an accumulation of pages in memory. It is destroyed if I use PopAsync instead. It is also destroyed with PopToRootAsync if I remove the NavigationPage.TitleView.
Steps to Reproduce
- Create a new Maui app project in Visual Studio (.NET 9)
- Modify
App.xaml.cs,MainPage.xaml.cs, andMainPage.xamlwith the below snippets - Start the app in an iOS simulator (mine is iPhone 15 iOS 18.1). If you click Push, Pop, Push, Pop, etc. you will notice that after 10-20 repetitions "Destroyed" is logged to the console (as many as the number of unloaded pages), indicating that the pages were destroyed.
- Restart the app. If you click Push, Pop To Root, Push, Pop To Root, etc. you will not see "Destroyed" even after many repetitions. (unless you accidentally clicked Pop)
- (optional) Remove the
NavigationPage.TitleView, and if you repeat step 4 you will see that now "Destroyed" is being logged.
MainPage.xaml (and replace MauiApp7 in x:Class with your project name)
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="MauiApp7.MainPage">
<NavigationPage.TitleView>
<Label>Test</Label>
</NavigationPage.TitleView>
<ScrollView>
<VerticalStackLayout
Padding="30,0"
Spacing="25">
<Image
Source="dotnet_bot.png"
HeightRequest="185"
Aspect="AspectFit"
SemanticProperties.Description="dot net bot in a hovercraft number nine" />
<Label
Text="Hello, World!"
Style="{StaticResource Headline}"
SemanticProperties.HeadingLevel="Level1" />
<Label
Text="Welcome to .NET Multi-platform App UI"
Style="{StaticResource SubHeadline}"
SemanticProperties.HeadingLevel="Level2"
SemanticProperties.Description="Welcome to dot net Multi platform App U I" />
<Button
x:Name="PushBtn"
Text="Push"
Clicked="OnPushClicked"
HorizontalOptions="Fill" />
<Button
x:Name="PopBtn"
Text="Pop"
Clicked="OnPopClicked"
HorizontalOptions="Fill" />
<Button
x:Name="PopToRootBtn"
Text="Pop To Root"
Clicked="OnPopToRootClicked"
HorizontalOptions="Fill" />
</VerticalStackLayout>
</ScrollView>
</ContentPage>MainPage.xaml.cs
public partial class MainPage : ContentPage
{
public MainPage()
{
Console.WriteLine("Created");
InitializeComponent();
}
~MainPage()
{
Console.WriteLine("Destroyed");
}
private void OnPushClicked(object sender, EventArgs e)
{
Navigation.PushAsync(new MainPage(), true);
}
private void OnPopClicked(object sender, EventArgs e)
{
if (Navigation.NavigationStack.Count > 0)
Navigation.PopAsync(true);
}
private void OnPopToRootClicked(object sender, EventArgs e)
{
Navigation.PopToRootAsync(true);
}
}App.xaml.cs
public partial class App : Application
{
public App()
{
InitializeComponent();
}
protected override Window CreateWindow(IActivationState? activationState)
{
return new Window(new NavigationPage(new MainPage()));
}
}Link to public reproduction project repository
No response
Version with bug
9.0.40 SR4
Is this a regression from previous behavior?
Not sure, did not test other versions
Last version that worked well
Unknown/Other
Affected platforms
iOS, I was not able test on other platforms
Affected platform versions
iOS 18.1
Did you find any workaround?
Use PopAsync instead