Issue Details

Shell.SearchHandler has a placeholder with a background color and SearchBarVisibility set to Expanded, the placeholder text is not shown on iOS 26.

Root Cause

• The issue was caused by the implementation of the UpdateSearchBarBackgroundColor method in SearchHandlerAppearanceTracker.cs. Styling was applied to an internal nested subview (textField.Subviews[0]) instead of directly modifying the UITextField.
• At the same time, the BackgroundColor property was also set on the UITextField itself. This resulted in a double-layer rendering problem where both the internal subview and the UITextField had background styling applied.
• Because of these overlapping layers, visual inconsistencies occurred, including incorrect corner radius rendering and placeholder text being partially obscured.

Description of Change

The fix removes dependency on internal subviews and directly styles the UITextField.

• Corner radius and background color are applied directly to the UITextField.
• Only a single background layer is used, eliminating the overlapping rendering issue.
• When the background is cleared, corner radius and clipping are reset properly.
• _hasCustomBackground is correctly managed.

Validated the behaviour in the following platforms

• Android
• Windows
• iOS
• Mac

Issues Fixed:

Fixes #33972

Screenshots

Before	After