Remove no longer used LaunchScreen.xib files from templates

[jfversluis]

Description of Change

Removes (as far as I can tell) unused LaunchScreen.xib files from the templates as these were causing issues with the iOS archiving. See related issue.

For reference, this is what it looks like, I think this was the default splash screen for new Xamarin apps at some point?

Fixes #3777

Additions made

NA

PR Checklist

• Targets the correct branch
• Tests are passing (or failures are unrelated)
• Targets a single property for a single control (or intertwined few properties)
• Adds the property to the appropriate interface
• Avoids any changes not essential to the handler property
• Adds the mapping to the PropertyMapper in the handler
• Adds the mapping method to the WinUI, Android, iOS, and Standard aspects of the handler
• Implements the actual property updates (usually in extension methods in the Platform section of Core)
• Tags ported renderer methods with [PortHandler]
• Adds an example of the property to the sample project (MainPage)
• Adds the property to the stub class
• Implements basic property tests in DeviceTests

Does this PR touch anything that might affect accessibility?

• Does this PR introduce a new control? (If yes, add an example using SemanticProperties to the SemanticsPage)
• APIs that modify focusability?
• APIs that modify any text property on a control?
• Does this PR modify view nesting or view arrangement in anyway?
• Is there the smallest possibility that your PR will change accessibility?
• I'm not sure, please help me

If any of the above checkboxes apply to your PR, then the PR will need to provide testing to demonstrate that accessibility still works.

[jfversluis]

Is there any way to test the templates without waiting for them to be released first?

[Redth]

@jfversluis there's a script in the folder you can use to build the template nuget packages and then you can dotnet new -i Microsoft.Maui.Templates.xyz.nupkg to install them and dotnet new maui to test...

Just remember to dotnet new -u Microsoft.Maui.Templates after so you don't mess up your global install :)

[jfversluis]

Thanks! Adding DNM until I/we verify this doesn't break anything and works when actually changed in the templates

[jfversluis]

Tested, all seems to work fine on my end. No errors, and splash screen shows as expected. @chamons were you investigating something on your end for iOS only?

[chamons]

Yes, I'm hoping to confirm (or refute) that iOS has a bug today. Unfortunately I'm having major issues getting XVS remote builds with NET6 working on my PC, so I'm waiting for help on testing things (to get a binlog).

[chamons]

But in any case, this PR has no issues FWICT and doesn't have to wait.

[Thomr77]

Hi,

We have also encountered this issue today with a Maui-Blazor project compiling in Release to an iPhone connected to the (build) Mac (17.1.0 Preview 1.1).

We deleted LaunchScreen.xib after reading through the discussions here, but the issue persisted - the same '//' in path e.g. "obj/Release/net6.0-ios/ios-arm64//stripped/Microsoft.Extensions.DependencyInjection.Abstractions.dll".

What I can add is that it compiles fine with the above constellation but in Debug and other custom-made types (but not Release).

[jfversluis]

@Thomr77 did you use the /p:EnableAssemblyILStripping=false flag? That is a separate bug that is fixed but not yet released. If you added that flag and it still doesn't work could you reach out on gerald.versluis@microsoft.com? Because I would love to learn more about it and see if we need more fixing in this area. Thanks!

[Thomr77]

@jfversluis confirming that it builds Release fine with /p:EnableAssemblyILStripping=false - Dank u!

[jfversluis]

Awesome @Thomr77 ! Thanks for letting me know! Goed weekend! Voor zover dat gaat met een nieuwe lockdown... 😅