Fixed BoxView in AbsoluteLayout did not return to its default AutoSize for Height and Width after reset

[Dhivya-SF4094]

Note

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Issue Details:

When a BoxView inside an AbsoluteLayout is defined with AutoSize for width and height, and later its bounds are changed to explicit values and then reset back to AutoSize, the reset fails on iOS.

Root Cause

On iOS/macOS, when a BoxView (or any Shape) inside an AbsoluteLayout is reset back to AutoSize, the control remains visible with its previous explicit bounds.
The issue occurs because the Bounds property in PlatformGraphicsView retains the previous size.
During measure, AbsoluteLayout queries the child’s desired size. Since PlatformGraphicsView.Bounds still holds the old value, the shape continues to visible.

Description of Change

Override GetDesiredSize in ShapeViewHandler.iOS.When VirtualView.Width or VirtualView.Height is NaN, set the corresponding dimension in the returned Size to 0.
This ensures that shapes like BoxView collapse correctly when reset to AutoSize, matching Android behavior.
Validated the behavior in the following platforms

• Android
• Windows
• iOS
• Mac

Reference

maui/src/Core/src/Handlers/ShapeView/ShapeViewHandler.Android.cs

Lines 64 to 78 in 3273d2b

	public override Size GetDesiredSize(double widthConstraint, double heightConstraint)
	{
	var result = base.GetDesiredSize(widthConstraint, heightConstraint);
	if (double.IsNaN(VirtualView.Width))
	{
	result.Width = 0;
	}
	if (double.IsNaN(VirtualView.Height))
	{
	result.Height = 0;
	}
	return result;

Issues Fixed:

Fixes #31496

Screenshots

Before	After
BeforeFix_31496_iOS.mov	AfterFix_31496_iOS.mov

[dotnet-policy-service]

Hey there @@Dhivya-SF4094! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[Copilot]

Pull Request Overview

This PR fixes a bug where BoxView controls inside AbsoluteLayout on iOS/macOS did not properly return to their default AutoSize state after being reset from explicit bounds. The issue was that the PlatformGraphicsView retained the previous size values, causing the shape to remain visible with its old dimensions.

• Overrides the GetDesiredSize method in ShapeViewHandler.iOS.cs to return 0 for width/height when those dimensions are NaN (AutoSize)
• Adds comprehensive UI tests to validate the fix across platforms
• Updates public API documentation to reflect the new override method

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Core/src/Handlers/ShapeView/ShapeViewHandler.iOS.cs	Implements the core fix by overriding GetDesiredSize to handle AutoSize properly
src/Controls/tests/TestCases.HostApp/Issues/Issue31496.cs	Creates the UI test page demonstrating the BoxView reset behavior
src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue31496.cs	Implements the automated test to verify the fix
src/Core/src/PublicAPI/net-ios/PublicAPI.Unshipped.txt	Documents the new public API method for iOS
src/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Unshipped.txt	Documents the new public API method for macOS

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