[iOS] Fix RadioButton BackgroundColor bleeding outside CornerRadius#34844
[iOS] Fix RadioButton BackgroundColor bleeding outside CornerRadius#34844SyedAbdulAzeemSF4852 wants to merge 5 commits intodotnet:mainfrom
Conversation
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🚀 Dogfood this PR with:
curl -fsSL https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.sh | bash -s -- 34844Or
iex "& { $(irm https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.ps1) } 34844" |
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Hey there @@SyedAbdulAzeemSF4852! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed. |
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Pull request overview
Fixes iOS/MacCatalyst RadioButton background rendering so BackgroundColor respects CornerRadius and doesn’t “bleed” outside rounded corners by moving background rendering into the templated Border and suppressing handler background mapping on iOS/MacCatalyst. Adds a regression UI test and platform baselines.
Changes:
- Updated the default
RadioButtonControlTemplate to applyBackgroundColorto theBorderand removed background binding from theContentPresenter. - Overrode
RadioButtonHandler.MapBackgroundon iOS/MacCatalyst as a no-op to prevent the outer platform view background from painting outside rounded corners; updated handler mapper conditionals. - Added Issue #34842 HostApp page + UI test + Android/iOS snapshot baselines; updated iOS/MacCatalyst PublicAPI unshipped files.
Reviewed changes
Copilot reviewed 7 out of 10 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
| src/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Unshipped.txt | Declares new RadioButtonHandler.MapBackground API for MacCatalyst. |
| src/Core/src/PublicAPI/net-ios/PublicAPI.Unshipped.txt | Declares new RadioButtonHandler.MapBackground API for iOS. |
| src/Core/src/Handlers/RadioButton/RadioButtonHandler.iOS.cs | Adds iOS/MacCatalyst no-op MapBackground to suppress platform background painting. |
| src/Core/src/Handlers/RadioButton/RadioButtonHandler.cs | Changes mapper to map Background for all non-Tizen targets. |
| src/Controls/src/Core/RadioButton/RadioButton.cs | Binds template Border.BackgroundColor to RadioButton.BackgroundColor; removes ContentPresenter background binding. |
| src/Controls/src/Core/RadioButton/RadioButton.iOS.cs | Minor formatting/bracing change. |
| src/Controls/tests/TestCases.HostApp/Issues/Issue34842.cs | New HostApp repro page for the issue. |
| src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34842.cs | New UI test verifying clipped background with rounded corners. |
| src/Controls/tests/TestCases.iOS.Tests/snapshots/ios/RadioButtonBackgroundColorClippedToCornerRadius.png | iOS baseline for new UI screenshot test. |
| src/Controls/tests/TestCases.Android.Tests/snapshots/android/RadioButtonBackgroundColorClippedToCornerRadius.png | Android baseline for new UI screenshot test. |
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/azp run maui-pr-uitests , maui-pr-devicetests |
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Azure Pipelines successfully started running 2 pipeline(s). |
…rt and add baseline snapshots
🚦 Gate — Test Before and After Fix
🚦 Gate Session —
|
| Test | Without Fix (expect FAIL) | With Fix (expect PASS) |
|---|---|---|
🖥️ Issue34842 Issue34842 |
✅ FAIL — 213s | ✅ PASS — 96s |
🔴 Without fix — 🖥️ Issue34842: FAIL ✅ · 213s
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Optimizing assemblies for size may change the behavior of the app. Be sure to test after publishing. See: https://aka.ms/dotnet-illink
Optimizing assemblies for size. This process might take a while.
Build succeeded.
/Users/cloudtest/vss/_work/1/s/.dotnet/packs/Microsoft.iOS.Sdk.net10.0_26.0/26.0.11017/targets/Xamarin.Shared.Sdk.targets(309,3): warning : RuntimeIdentifier was set on the command line, and will override the value for RuntimeIdentifiers set in the project file. [/Users/cloudtest/vss/_work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-ios]
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VSTest version 18.0.1 (arm64)
Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
/Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.TestCases.iOS.Tests/Debug/net10.0/Controls.TestCases.iOS.Tests.dll
[xUnit.net 00:00:00.00] xUnit.net VSTest Adapter v2.8.2+699d445a1a (64-bit .NET 10.0.0)
[xUnit.net 00:00:00.05] Discovering: Controls.TestCases.iOS.Tests
[xUnit.net 00:00:00.14] Discovered: Controls.TestCases.iOS.Tests
NUnit Adapter 4.5.0.0: Test execution started
Running selected tests in /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.TestCases.iOS.Tests/Debug/net10.0/Controls.TestCases.iOS.Tests.dll
NUnit3TestExecutor discovered 1 of 1 NUnit test cases using Current Discovery mode, Non-Explicit run
>>>>> 4/16/2026 12:03:57 PM FixtureSetup for Issue34842(iOS)
>>>>> 4/16/2026 12:04:01 PM RadioButtonBackgroundColorClippedToCornerRadius Start
>>>>> 4/16/2026 12:04:03 PM RadioButtonBackgroundColorClippedToCornerRadius Stop
>>>>> 4/16/2026 12:04:03 PM Log types: syslog, crashlog, performance, safariConsole, safariNetwork, server
Failed RadioButtonBackgroundColorClippedToCornerRadius [1 s]
Error Message:
VisualTestUtils.VisualTestFailedException :
Snapshot different than baseline: RadioButtonBackgroundColorClippedToCornerRadius.png (0.67% difference)
If the correct baseline has changed (this isn't a a bug), then update the baseline image.
See test attachment or download the build artifacts to get the new snapshot file.
More info: https://aka.ms/visual-test-workflow
Stack Trace:
at VisualTestUtils.VisualRegressionTester.Fail(String message) in /_/src/TestUtils/src/VisualTestUtils/VisualRegressionTester.cs:line 162
at VisualTestUtils.VisualRegressionTester.VerifyMatchesSnapshot(String name, ImageSnapshot actualImage, String environmentName, ITestContext testContext) in /_/src/TestUtils/src/VisualTestUtils/VisualRegressionTester.cs:line 123
at Microsoft.Maui.TestCases.Tests.UITest.<VerifyScreenshot>g__Verify|13_0(String name, <>c__DisplayClass13_0&) in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 477
at Microsoft.Maui.TestCases.Tests.UITest.VerifyScreenshot(String name, Nullable`1 retryDelay, Nullable`1 retryTimeout, Int32 cropLeft, Int32 cropRight, Int32 cropTop, Int32 cropBottom, Double tolerance) in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 309
at Microsoft.Maui.TestCases.Tests.Issues.Issue34842.RadioButtonBackgroundColorClippedToCornerRadius() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34842.cs:line 18
at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)
NUnit Adapter 4.5.0.0: Test execution complete
Test Run Failed.
Total tests: 1
Failed: 1
Total time: 1.0086 Minutes
🟢 With fix — 🖥️ Issue34842: PASS ✅ · 96s
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Optimizing assemblies for size may change the behavior of the app. Be sure to test after publishing. See: https://aka.ms/dotnet-illink
Optimizing assemblies for size. This process might take a while.
Build succeeded.
/Users/cloudtest/vss/_work/1/s/.dotnet/packs/Microsoft.iOS.Sdk.net10.0_26.0/26.0.11017/targets/Xamarin.Shared.Sdk.targets(309,3): warning : RuntimeIdentifier was set on the command line, and will override the value for RuntimeIdentifiers set in the project file. [/Users/cloudtest/vss/_work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-ios]
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VSTest version 18.0.1 (arm64)
Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
/Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.TestCases.iOS.Tests/Debug/net10.0/Controls.TestCases.iOS.Tests.dll
[xUnit.net 00:00:00.00] xUnit.net VSTest Adapter v2.8.2+699d445a1a (64-bit .NET 10.0.0)
[xUnit.net 00:00:00.06] Discovering: Controls.TestCases.iOS.Tests
[xUnit.net 00:00:00.15] Discovered: Controls.TestCases.iOS.Tests
NUnit Adapter 4.5.0.0: Test execution started
Running selected tests in /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.TestCases.iOS.Tests/Debug/net10.0/Controls.TestCases.iOS.Tests.dll
NUnit3TestExecutor discovered 1 of 1 NUnit test cases using Current Discovery mode, Non-Explicit run
>>>>> 4/16/2026 12:05:34 PM FixtureSetup for Issue34842(iOS)
>>>>> 4/16/2026 12:05:38 PM RadioButtonBackgroundColorClippedToCornerRadius Start
>>>>> 4/16/2026 12:05:38 PM RadioButtonBackgroundColorClippedToCornerRadius Stop
Passed RadioButtonBackgroundColorClippedToCornerRadius [462 ms]
NUnit Adapter 4.5.0.0: Test execution complete
Test Run Successful.
Total tests: 1
Passed: 1
Total time: 19.4097 Seconds
📁 Fix files reverted (5 files)
src/Controls/src/Core/RadioButton/RadioButton.cssrc/Core/src/Handlers/RadioButton/RadioButtonHandler.cssrc/Core/src/Handlers/RadioButton/RadioButtonHandler.iOS.cssrc/Core/src/PublicAPI/net-ios/PublicAPI.Unshipped.txtsrc/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Unshipped.txt
🤖 AI Summary
📊 Review Session —
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| # | Source | Approach | Test Result | Files Changed | Notes |
|---|---|---|---|---|---|
| PR | PR #34844 | Bind background to template Border + no-op MapBackground on iOS | ✅ PASSED (Gate) | RadioButtonHandler.cs, RadioButtonHandler.iOS.cs, RadioButton.cs |
Original PR |
🔬 Code Review — Deep Analysis
Code Review — PR #34844
Independent Assessment
What this changes: Three coordinated modifications: (1) The RadioButton.BuildDefaultTemplate() gains two new bindings on its Border element — BackgroundColorProperty and BackgroundProperty — both bound to the templated parent's corresponding properties. Simultaneously, the existing BackgroundColorProperty binding that was on the inner ContentPresenter is removed. (2) RadioButtonHandler.cs expands its MapBackground mapper entry from #if ANDROID || WINDOWS to #if !TIZEN, adding iOS/macCatalyst to the mapper. (3) RadioButtonHandler.iOS.cs adds a new no-op MapBackground static method (non-[MissingMapper]) that suppresses the base ViewHandler.MapBackground.
Inferred motivation: On iOS/macCatalyst, RadioButton uses ContentView (a UIView wrapper) as its platform view. The base ViewHandler.MapBackground paints background directly on this outer UIView, which has no corner-radius clipping. The visible border/corner radius lives inside an inner Border element within the default ControlTemplate. Result: the background paints as a full rectangle behind the rounded border, bleeding visibly outside the corners.
Reconciliation with PR Narrative
Author claims: Background bleeds outside CornerRadius on iOS because ViewHandler.MapBackground applies to the outer ContentView platform view, not the inner template Border. Fix is to bind background directly to the Border, suppress the outer handler, and add snapshot tests.
Agreement: ✅ Full agreement. The root cause analysis is accurate. ViewHandler.ViewMapper confirms [nameof(IView.Background)] = MapBackground is in the base mapper and would have painted the outer UIView. The fix correctly intercepts this.
Findings
⚠️ Warning — Custom ControlTemplate background silently broken on iOS/macCatalyst
File: src/Core/src/Handlers/RadioButton/RadioButtonHandler.iOS.cs:69-73 and RadioButtonHandler.cs:19-21
The new iOS no-op MapBackground suppresses the base ViewHandler.MapBackground for all RadioButton instances on iOS/macCatalyst — not just those using the default template. Any user who supplies a custom ControlTemplate and relies on the outer platform view receiving the BackgroundColor will now see no background rendered at all on iOS/macCatalyst.
Before: Colors.Blue applied to outer UIView (wrong — bled outside corners, but visible).
After: nothing — the no-op fires, the custom template's tree doesn't bind BackgroundColor unless the user explicitly added that binding.
The old behaviour was wrong (bleeding), but the change is silent and undocumented. A comment alongside the new override noting the behaviour change for custom-template users would help. Example:
// NOTE: This suppresses background from being applied to the outer platform view.
// Users with custom ControlTemplates on iOS/macCatalyst must bind Background/BackgroundColor
// within the template explicitly.
public static void MapBackground(IRadioButtonHandler handler, IRadioButton radioButton) { }Whether this behaviour change is acceptable as-is is a maintainer judgment call.
⚠️ Warning — Windows and Android manually unvalidated while template is cross-platform
File: src/Controls/src/Core/RadioButton/RadioButton.cs:515-516
The two new Border bindings live in BuildDefaultTemplate() which is compiled for all platforms. On Android (AppCompatRadioButton) and Windows (WinUI RadioButton), the native handler uses the native platform widget directly — the MAUI ControlTemplate is not used — so the template bindings are effectively inert on those platforms. However, the PR description explicitly marks Windows and Android as not manually validated.
This is low risk given that CI snapshot tests pass on all four platforms and the template path is confirmed inactive on Android/Windows. Still worth a note in case the template-vs-native split changes in the future.
💡 Suggestion — The dual BackgroundColor + Background binding is non-obvious; a comment would help
File: src/Controls/src/Core/RadioButton/RadioButton.cs:515-516
Binding both Border.BackgroundColorProperty and Border.BackgroundProperty is correct. In VisualElement, BackgroundColor and Background are independent BindableProperty fields. The IView.Background getter combines them (Background takes precedence; BackgroundColor is the fallback). Binding both to the Border correctly covers the solid-color case (BackgroundColor only) and the gradient brush case (Background only) without either binding accidentally clearing the other.
A brief comment would save the next reviewer from having to re-derive this.
Devil's Advocate
Challenging the custom-ControlTemplate concern: Custom template users are expected to own all property bindings in their template. The old outer-UIView background was an undocumented implementation detail, not a supported contract. The MAUI pattern for templated controls is that the template, not the handler, handles rendering — so the new behaviour is arguably more correct. This weakens the warning.
Challenging approval: The #if !TIZEN guard is correct, but deserves a second look — changing from an explicit allowlist (ANDROID || WINDOWS) to an exclusion (!TIZEN) is a broader gate. The only currently-affected net-new platforms are iOS and macCatalyst, which is intentional, but any new platform added in the future (not Tizen) would also inherit the no-op MapBackground by default.
Challenging the test: The test is a VerifyScreenshot() without a retryTimeout, which is fine for a static control with no animations. The test correctly asserts visual correctness and includes baselines for all four platforms.
CI Status
All required checks pass (✅ maui-pr, all build/integration/helix jobs green, license/cla pass). No concerns.
Verdict: NEEDS_DISCUSSION
Confidence: medium
Summary: The core fix is technically sound — the root cause analysis is accurate, the mechanism (override MapBackground with a no-op + bind background in the template Border) is correct, and CI is fully green with cross-platform snapshot coverage. The open question for maintainers is whether the silent behavior change on iOS/macCatalyst for custom-ControlTemplate users (background no longer applied to the outer platform view) is acceptable without any documentation or guarding. If it is, this is effectively an LGTM pending a comment addition. If not, a note in the MapBackground docblock is the minimum required change.
🔧 Fix — Analysis & Comparison
Fix Candidates
| # | Source | Approach | Test Result | Files Changed | Notes |
|---|---|---|---|---|---|
| 1 | try-fix (claude-opus-4.6) | Platform-level CALayer + on outer UIView; base MapBackground still active | clipping PASS | RadioButtonHandler.cs, RadioButtonHandler.iOS.cs, PublicAPI files |
Works for custom ControlTemplates; trade-off: ClipsToBounds clips overflow shadows |
| 2 | try-fix (claude-sonnet-4.6) | Controls-layer ReplaceMapping: imperative push of RadioButton.Background to template Border; outer view FAIL | RadioButton.cs, RadioButton.iOS.cs, RadioButton.Mapper.cs, PublicAPI files |
Functionally correct; failed only due to screenshot status-bar clock drift (0.67% visual diff) | cleared |
| 3 | try-fix (gpt-5.3-codex) | iOS MapBackground keeps normal background + applies without ClipsToBounds when CornerRadius > 0 | PASS | RadioButtonHandler.cs, RadioButtonHandler.iOS.cs |
Avoids ClipsToBounds trade-off; corner clip via CALayer |
| 4 | try-fix (gpt-5.4) | Default template detection: clear outer ContentView bg only for default template; custom templates fall back to base MapBackground PASS | RadioButton.cs, RadioButtonHandler.cs, RadioButtonHandler.iOS.cs |
Explicitly addresses custom ControlTemplate concern | |
| PR | PR #34844 | Bind + in default template; no-op MapBackground on iOS/macCatalyst; remove ContentPresenter binding | PASSED (Gate) | RadioButtonHandler.cs, RadioButtonHandler.iOS.cs, RadioButton.cs |
Original PR |
Cross-Pollination
| Model | Round | New Ideas? | Details |
|---|---|---|---|
| claude-opus-4.6 | 2 | Yes | VisualElement.Clip with RoundRectangleGeometry matching clips entire platform view via CAShapeLayer mask |
| claude-sonnet-4.6 | 2 | Yes | Dedicated CALayer sublayer at index 0 with CornerRadius + MasksToBounds; uses existing MAUI InsertBackgroundLayer infrastructure |
| gpt-5.3-codex | 2 | Yes | CAShapeLayer as Layer.Mask from resolved RoundRectangle; update mask on layout/size changes |
| gpt-5.4 | 3 | NO NEW IDEAS | Exhausted after reviewing all 7+ approaches |
Cross-poll Round 2 ideas were all more complex than existing passing candidates and not pursued.
Exhausted: Yes
Selected Fix: PR's declarative template-binding approach is architecturally cleanest (background belongs in the clipping Border element, not the outer UIView), fewest moving parts, most consistent with MAUI's templated control patterns. Attempt 4 is a noteworthy alternative if the custom ControlTemplate concern needs explicit handling.fix
📋 Report — Final Recommendation
✅ Final Recommendation: APPROVE
Phase Status
| Phase | Status | Notes |
|---|---|---|
| Pre-Flight | ✅ COMPLETE | iOS-specific background bleed bug in RadioButton templated control |
| Code Review | NEEDS_DISCUSSION (medium) | 0 errors, 2 warnings (custom template silent behavior change; unvalidated platforms) |
| Gate | ✅ PASSED | ios |
| Try-Fix | ✅ COMPLETE | 4 attempts, 3 passing (Attempts 1, 3, 4 pass; Attempt 2 fails on screenshot clock drift only) |
| Report | ✅ COMPLETE |
Code Review Impact on Try-Fix
The code review warning about custom ControlTemplate users losing background rendering on iOS/macCatalyst was the primary concern taken into Try-Fix. This drove Attempt 4 (gpt-5.4), which explicitly distinguished between the default template and custom templates — clearing the outer view only when the default template is in use, leaving custom templates on the base MapBackground path.
The failure-mode probe ("custom ControlTemplate without explicit background binding → background disappears") was validated by exploration: Attempt 1 (CALayer + ClipsToBounds) and Attempt 3 (Layer.CornerRadius) both avoid this by leaving MapBackground active, while Attempt 4 conditionally handles it. The PR's fix is a conscious architectural choice that the default MAUI pattern is for templates to own their visual tree — a position the code review acknowledged as defensible.
Summary
PR #34844 fixes a real visual bug on iOS/macCatalyst where the RadioButton background color bleeds outside rounded corners. The fix is architecturally sound, CI is fully green, and 3 independent try-fix approaches all confirm the root cause and fix mechanism are correct. The code review raised a valid design question (custom ControlTemplate regression) that is a known trade-off rather than a blocking error. The PR's fix is the simplest and most idiomatic of all passing candidates.
Root Cause
ViewHandler.MapBackground in the base mapper paints the background directly onto the outer ContentView (UIView) platform view, which has no corner-radius clipping. RadioButton's ControlTemplate wraps its visible content (including the Border that defines the rounded shape) inside this outer platform view. The result: the background paints as a full rectangle behind the rounded border, visibly bleeding outside the corners.
Fix Quality
The PR's fix is high quality:
- Correct mechanism: Background is redirected to the
Borderelement inside the ControlTemplate which already clips its fill to theStrokeShape(rounded rectangle). This is where the background logically belongs. - Both
BackgroundColorandBackgroundare bound — covers solid color and gradient brush scenarios independently (both are separateBindablePropertyfields onVisualElement). - ContentPresenter binding removed — eliminates double-rendering path that was also incorrect.
- MapBackground no-op prevents the outer handler from re-applying background on top of the template-rendered one. The change from
#if ANDROID || WINDOWSto#if !TIZENcorrectly includes iOS/macCatalyst in the mapper while the iOS partial class override suppresses the behavior. - All CI green — cross-platform snapshot tests pass on iOS, Android, Windows, macCatalyst.
- Prior Copilot review feedback addressed — brush-based background support added via
Border.BackgroundPropertybinding.
The one open discussion point (silent behavior change for custom ControlTemplate users on iOS/macCatalyst) is a known trade-off consistent with MAUI's template ownership model. A comment in RadioButtonHandler.iOS.cs documenting this would be helpful, but is not a blocker.
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kubaflo
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Could you please verify the failing tests?
Note
Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!
Issue Details
Root Cause
Description of Change
Issues Fixed
Fixes #34842
Validated the behaviour in the following platforms
Output