[iOS] Shell/NavigationPage TitleView

[kubaflo]

Fixes #9333
Fixes #19231
Fixes #5063

Current behavior

Layout options have no effect on the title view. The content inside the titleView behaves as it has both HorizontalOptions and VerticalOptions set to Fill. Also, notice that there's a horizontal margin that cannot be removed even with setting the negative values to margin eg. Margin="-20,0" (#19231)

Currently

Proposed behavior #5063

Utilizes our current LayoutOptions to indicate how you want a TitleView to layout on the screen and removes the default horizontal margin so that we can customize it.

<NavigationPage.TitleView>
    <HorizontalStackLayout BackgroundColor="red">
        <Label VerticalOptions="Center" Text="Navigation page's title"/>
        <Image Source="dotnet_bot.png" Scale="0.8"/>
    </HorizontalStackLayout>
</NavigationPage.TitleView>

Default - (horizontal and vertical options set to fill implicitly)

HorizontalOptions="Start"

HorizontalOptions="Center"

HorizontalOptions="End"

VerticalOptions="Start"

VerticalOptions="Center"

VerticalOptions="End"

VerticalOptions="Start" HorizontalOptions="Start"

VerticalOptions="Center" HorizontalOptions="Center"

VerticalOptions="End" HorizontalOptions="End"

Remarks

I didn't implement anything that changes the behavior when additional toolbar items are added. For example, if there's a back button the title view places itself to the right of this button. It is because I'm not sure what is the desired behavior. On one hand, it looks weird that when we want to center the title it is moved to the right, but on the other, it is the default iOS's behavior and I believe a future discussion should be made xamarin/Xamarin.Forms#4848

[ghost]

Hey there @kubaflo! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Pastajello]

Oh my, never knew I'd see a fix from the issue I suffered from 4 years ago in X.F. days! Are there any plans to add it to .net 8 SR 4? (hopefully)

[jsuarezruiz]

Could you include a comment with a link to the Apple docs or similar?

[jsuarezruiz]

Have you done tests with 6.1" and 6.7" simulators or devices?

[jsuarezruiz]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[PureWeen]

can you retarget this for net9?

[kubaflo]

can you retarget this for net9?

Yep, I think it is a good idea