Fix for [iOS] Use non-overridden traits in AppInfoImplementation.RequestTheme

[SuthiYuvaraj]

Root Cause

While updating the requested theme, the default TrailCollection is obtained, which does not return non-overridden traits and does not take the system theme into account.

Description of Change

UIScreen.MainScreen.TraitCollection is obtained , which will return non overridden traits based on the system theme

Issues Fixed

Fixes #23411

Output Video

Before Issue Fix	After Issue Fix
BeforeFix.mov	AfterFix.mov

[karthikraja-arumugam]

The fix ensures the theme updates correctly on the current page, but the main page still retains the previously requested theme, even when updating the application's current theme.

@filipnavara, do you have any thoughts on this?

[filipnavara]

do you have any thoughts on this?

I'll have to check again what is going on in the test app. That sounds like the exact behavior this was trying to fix...

[jsuarezruiz]

/azp run

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Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

/azp run

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Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

/rebase

[jsuarezruiz]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[sheiksyedm]

/rebase

[jsuarezruiz]

/azp run

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Azure Pipelines successfully started running 3 pipeline(s).

Changes addressed

[mattleibow]

/azp run

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[PureWeen]

/Users/builder/azdo/_work/1/s/src/Controls/tests/TestCases.HostApp/Issues/Issue23411.xaml.cs(18,39): error CS1998: This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread. [/Users/builder/azdo/_work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net9.0-ios]

[PureWeen]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[PureWeen]

• Failing tests are unrelated