[Housekeeping] Refactor iOS large titles sample

[kubaflo]

Replaces the old LargeTitlesPageiOS.cs with an enhanced iOSLargeTitlePage.xaml.cs implementation, providing improved UI and more comprehensive large title and navigation bar demonstrations. Removes the legacy page from OthersViewModel and updates the sample to use the new, feature-rich version.

Screen.Recording.2025-12-10.at.00.48.28.mov

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.sh | bash -s -- 33084

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.ps1) } 33084"

[Copilot]

Pull request overview

This PR refactors the iOS large titles sample by replacing the legacy LargeTitlesPageiOS.cs with an enhanced iOSLargeTitlePage.xaml.cs implementation. The new version provides a more comprehensive demonstration of iOS large title features including display modes, navigation configuration, scrolling behavior, and transparent navigation bars.

• Removes the old large titles page reference from OthersViewModel
• Implements a feature-rich large titles demo with multiple interactive examples
• Deletes the legacy LargeTitlesPageiOS.cs file

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 8 comments.

File	Description
src/Controls/samples/Controls.Sample/ViewModels/OthersViewModel.cs	Removes the legacy LargeTitlesPageiOS entry from the Others section
src/Controls/samples/Controls.Sample/Pages/PlatformSpecifics/iOS/iOSLargeTitlePage.xaml.cs	Complete reimplementation with enhanced UI demonstrations, including display modes, navigation configuration, scrolling behavior, and transparent navigation bar examples
src/Controls/samples/Controls.Sample/Pages/Others/LargeTitlesPageiOS.cs	Deletes the old large titles page implementation

[Copilot]

The code casts Parent to NavigationPage without null checking. If Parent is null or not a NavigationPage, this will throw an InvalidCastException at runtime. Consider using a null-conditional pattern cast with a null check:

if (Parent is Microsoft.Maui.Controls.NavigationPage navPage) { navPage.On<iOS>().SetPrefersLargeTitles(!navPage.On<iOS>().PrefersLargeTitles()); // ... rest of code }

Suggested change

	var navPage = (Microsoft.Maui.Controls.NavigationPage)Parent;
	navPage.On<iOS>().SetPrefersLargeTitles(!navPage.On<iOS>().PrefersLargeTitles());
	// Refresh the page to show the change
	Navigation.InsertPageBefore(new iOSLargeTitlePage(),this);
	await Navigation.PopAsync(false);
	if (Parent is Microsoft.Maui.Controls.NavigationPage navPage)
	{
	navPage.On<iOS>().SetPrefersLargeTitles(!navPage.On<iOS>().PrefersLargeTitles());
	// Refresh the page to show the change
	Navigation.InsertPageBefore(new iOSLargeTitlePage(),this);
	await Navigation.PopAsync(false);
	}

[Copilot]

The code casts Parent to NavigationPage without null checking. If Parent is null or not a NavigationPage, this will throw an InvalidCastException at runtime. Consider using a pattern cast with a null check:

if (Parent is Microsoft.Maui.Controls.NavigationPage navPage) { navPage.On<iOS>().SetPrefersLargeTitles(true); // ... rest of code }

Suggested change

	var navPage = (Microsoft.Maui.Controls.NavigationPage)Parent;
	navPage.On<iOS>().SetPrefersLargeTitles(true);
	if (Parent is Microsoft.Maui.Controls.NavigationPage navPage)
	{
	navPage.On<iOS>().SetPrefersLargeTitles(true);
	}

[Copilot]

The code casts Parent to NavigationPage without null checking. If Parent is null or not a NavigationPage, this will throw an InvalidCastException at runtime. Consider using a pattern cast with a null check:

if (Parent is Microsoft.Maui.Controls.NavigationPage navPage) { navPage.On<iOS>().SetPrefersLargeTitles(true); // ... rest of code }

[Copilot]

The code casts Parent to NavigationPage without null checking. If Parent is null or not a NavigationPage, this will throw an InvalidCastException at runtime. Consider using a pattern cast with a null check:

if (Parent is Microsoft.Maui.Controls.NavigationPage navPage) { navPage.On<iOS>().SetPrefersLargeTitles(true); // ... rest of code }

[Copilot]

The class is declared as partial but InitializeComponent() is never called, and the existing XAML file (iOSLargeTitlePage.xaml) references event handlers (OnButtonClicked, OnReturnButtonClicked) that don't exist in this code-behind. Either:

1. Remove the partial modifier and delete the XAML file if the page is fully code-based, or
2. Call InitializeComponent() and update the XAML to match the new implementation.

The current state will cause a runtime exception when the XAML tries to wire up non-existent event handlers.

Suggested change

	public partial class iOSLargeTitlePage : ContentPage
	public class iOSLargeTitlePage : ContentPage

[jfversluis]

@kubaflo what is going on here? If there is no XAML file then why is it called xaml.cs?

[kubaflo]

Right! It was called xaml.cs because there was a xaml file but hasn't been used. Fixed

[jfversluis]

@kubaflo can you check the comments? I think otherwise should be good, thanks!

[jfversluis]

/azp run MAUI-UITests-public

[azure-pipelines]

No pipelines are associated with this pull request.

[jfversluis]

/rebase

[kubaflo]

@jfversluis can you pls /azp again? I've removed unnecessary files and fixed compilation error which copilot did 😅