[Android, iOS, WinUI] NavigationPage.TitleView not showing

[AlexeyZhukoff]

Implementation Notes

• iOS should just work like it did currently in XF. If it's not showing up that's most likely an issue with the old code not playing nicely with the new layout system. NavigationPage on iOS is now based on a ViewHandler base so it should be easier to make this work
• WinUI has been completely rewritten so I don't know how much of the old code will be re-usable here. The header control itself is mostly the same control so hopefully you can just plop the TitleView into the ContentControl and it'll work perfectly. Shell and NavigationPage on WinUI are now all based on the same core code so fixing this on NavigationPage should also take care of this issue.
• The Android Toolbar is now using the Material Toolbar. The Material Toolbar has some additional APIs for centering the title text but I'm not sure if this will help us with the TitleView.

Stretch goal

xamarin/Xamarin.Forms#4848

One of the huge frustrations with the current titleview implementation is that it's VERY difficult to center your content. One of the hopes here was to make it so the TitleView would obey the LayoutOptions specified.

• Nothing Specified: Maintain current behavior
• Center: Center the content on the header
• Start: align the content against the left edge (or against the back button/flyoutout button if present)
• End: align the content against the right edge (or against the toolbar items if present)
• Fill: TitleView takes up the entire appbar

Description

Not possible customize TitleView of Custom Page.
TitleView not shown.

Steps to Reproduce

1. Create the .NET MAUI App
2. Modificate MainPage.xaml, insert "<NavigationPage.TitleView></NavigationPage.TitleView>" after opened ContentPage tag.
3. Run the application

Version with bug

Preview 11

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android

Affected platform versions

iOS 15, Android 11

Did you find any workaround?

No

Relevant log output

No response

[nogginbox]

I'm also experiencing this. I thought I was doing it wrong!

It is also happening on Windows.

[PureWeen]

Related
xamarin/Xamarin.Forms#4848

[nevse]

Let me clarify - the error is not in the layout, it is not displayed at all under the android

A simple project can be found here https://github.com/nevse/Maui-Tests-NavBarTitleView

[PureWeen]

The TitleView property hasn't been ported over yet. The NavigationPage layer was rebuilt on Android/WinUI so they are pending re-implementation.

[kristinx0211]

verify repro Repro on Version 17.2.0 Preview 2.0 [32216.282.main] with the above project.

[hartez]

TitleView for Windows is in review: #5293.

That PR also makes the TitleView show up on Android.