Non-nullable property 'Controller' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

This call site is reachable on: 'iOS' 11.0 and later, 'maccatalyst' 11.0 and later. 'UIApplication.KeyWindow' is obsoleted on: 'ios' 13.0 and later (Should not be used for applications that support multiple scenes because it returns a key window across all connected scenes.), 'maccatalyst' 13.0 and later (Should not be used for applications that support multiple scenes because it returns a key window across all connected scenes.). (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1422)

This call site is reachable on: 'iOS' 11.0 and later, 'maccatalyst' 13.0 and later. 'UIColor.SystemBackground' is only supported on: 'ios' 13.0 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on: 'iOS' 11.0 and later, 'maccatalyst' 13.0 and later. 'UIViewController.ModalInPresentation' is only supported on: 'ios' 13.0 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on: 'iOS' 11.0 and later, 'maccatalyst' 11.0 and later. 'UISheetPresentationControllerDetent.CreateMediumDetent()' is only supported on: 'ios' 15.0 and later, 'maccatalyst' 15.0 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on: 'iOS' 11.0 and later, 'maccatalyst' 11.0 and later. 'UISheetPresentationControllerDetentIdentifier.Large' is only supported on: 'ios' 15.0 and later, 'maccatalyst' 15.0 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on: 'iOS' 11.0 and later, 'maccatalyst' 11.0 and later. 'UISheetPresentationControllerDetent.CreateLargeDetent()' is only supported on: 'ios' 15.0 and later, 'maccatalyst' 15.0 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on: 'iOS' 11.0 and later, 'maccatalyst' 11.0 and later. 'IUISheetPresentationControllerDetentResolutionContext.MaximumDetentValue' is only supported on: 'ios' 16.0 and later, 'maccatalyst' 16.0 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)

This call site is reachable on: 'iOS' 11.0 and later, 'maccatalyst' 11.0 and later. 'UISheetPresentationControllerDetentIdentifier.Medium' is only supported on: 'ios' 15.0 and later, 'maccatalyst' 15.0 and later. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1416)