[iOS] Fix for Left SwipeView Items Conflict with Shell Menu Swipe Gesture

[Tamilarasan-Paranthaman]

Root Cause of the issue

• When swiping to the left in the SwipeView, the shell flyout gesture intercepts the SwipeView gesture and causes the shell flyout to open.

Description of Change

• I resolved the issue by identifying if the view is a MauiSwipeView. If it is, I restricted the touch interaction in the shell flyout, allowing the SwipeView touch gestures to work as expected.

Issues Fixed

Fixes #26933

Tested the behaviour in the following platforms

• Android
• Windows
• iOS
• Mac

Screenshot

Before Issue Fix	After Issue Fix
SwipeViewIssue.mov	SwipeViewFix.mov

Reference from Xamarin

https://github.com/xamarin/Xamarin.Forms/blob/2f8f4864a4d289dc89a6228e2ca9d6a49993e365/Xamarin.Forms.Platform.iOS/Renderers/ShellFlyoutRenderer.cs#L85

[dotnet-policy-service]

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

[rmarinho]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[jsuarezruiz]

In Xamarin.Forms, the SwipeViewRenderer manage this cases, enabling/disabling parent gestures while the SwipeView is capturing the touch events https://github.com/xamarin/Xamarin.Forms/blob/2f8f4864a4d289dc89a6228e2ca9d6a49993e365/Xamarin.Forms.Platform.Android/Renderers/SwipeViewRenderer.cs#L1508
Could review it, and apply a similar approach with the handler?

[Tamilarasan-Paranthaman]

@jsuarezruiz, I have resolved the issue where the Shell flyout gesture intercepts the SwipeView gesture on iOS. However, it seems the provided code reference to Xamarin.Forms on Android.

Upon reviewing the Xamarin.Forms implementation for iOS in the SwipeViewRenderer, I observed the relevant logic:
https://github.com/xamarin/Xamarin.Forms/blob/5.0.0/Xamarin.Forms.Platform.iOS/Renderers/SwipeViewRenderer.cs#L851

A similar approach has already been included into .NET MAUI within MauiSwipeView.iOS (the platformView of SwipeView on iOS):
https://github.com/dotnet/maui/blob/main/src/Core/src/Platform/iOS/MauiSwipeView.cs#L516

The fix I implemented is based on the ShellFlyoutRenderer logic in Xamarin.Forms:
https://github.com/xamarin/Xamarin.Forms/blob/2f8f4864a4d289dc89a6228e2ca9d6a49993e365/Xamarin.Forms.Platform.iOS/Renderers/ShellFlyoutRenderer.cs

However, I noticed that the equivalent logic is currently absent in the ShellFlyoutRenderer implementation for iOS in .NET MAUI.