[iOS] Fix for DatePicker FlowDirection Not Working on iOS

[SyedAbdulAzeemSF4852]

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

• When setting the FlowDirection property on a DatePicker control, the control remains left-to-right (LTR) on iOS, regardless of the specified FlowDirection.

Root Cause

• The iOS MapFlowDirection used a concrete type (DatePickerHandler) instead of the expected interface (IDatePickerHandler), causing the system to skip the platform-specific implementation and fall back to the generic ViewHandler.MapFlowDirection, which lacked the necessary text alignment logic for iOS.

Description of Change

• Corrected the MapFlowDirection method signature to align with the handler mapping system's interface contract.
• Added logic to update text alignment in DatePickerExtensions.cs based on the EffectiveFlowDirection property, ensuring proper alignment for RightToLeft and LeftToRight flow directions.
• Documented the updated API signature and method changes for accurate public API tracking.

Issues Fixed

Fixes #30065

Validated the behaviour in the following platforms

• Windows
• Android
• iOS
• Mac

Output

Before	After
Before.mov	After.mov

[Copilot]

Pull Request Overview

This PR fixes an issue where the DatePicker control's FlowDirection was not being applied properly on iOS by correcting the API signature and adding logic for text alignment adjustments.

• Updated the MapFlowDirection method signature to use IDatePickerHandler instead of DatePickerHandler.
• Added text alignment logic in DatePickerExtensions.cs based on the effective flow direction.
• Included new test cases in TestCases.HostApp and TestCases.Shared.Tests to validate the fix.

Reviewed Changes

Copilot reviewed 10 out of 12 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	Updated the API signature to match the expected interface type for MapFlowDirection.
src/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Shipped.txt	Removed the old signature to reflect the breaking change.
src/Core/src/PublicAPI/net-ios/PublicAPI.Unshipped.txt	Updated the API signature to match the expected interface type for MapFlowDirection.
src/Core/src/PublicAPI/net-ios/PublicAPI.Shipped.txt	Removed the old signature to reflect the breaking change.
src/Core/src/Platform/iOS/DatePickerExtensions.cs	Added logic to adjust text alignment based on EffectiveFlowDirection.
src/Core/src/Handlers/DatePicker/DatePickerHandler.iOS.cs	Updated the MapFlowDirection method signature to use IDatePickerHandler.
src/Core/src/Handlers/DatePicker/DatePickerHandler.cs	Updated the MapFlowDirection method signature in the handler class.
src/Core/src/Handlers/DatePicker/DatePickerHandler.MacCatalyst.cs	Updated the MapFlowDirection method signature to use IDatePickerHandler.
src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue30065.cs	Added a test case to validate DatePicker FlowDirection behavior.
src/Controls/tests/TestCases.HostApp/Issues/Issue30065.cs	Added a test page to validate switching FlowDirection on DatePicker.

Comments suppressed due to low confidence (1)

[Copilot]

The removal and update of the MapFlowDirection signature here introduces a breaking change in the public API. Please ensure that all consumers are aware of this change and update their implementations accordingly.

[Copilot]

The method signature change for MapFlowDirection in the iOS handler is a breaking API change. Ensure that all related documentation and client codes reflect the new interface usage.

[Copilot]

The updated MapFlowDirection signature in the handler class changes the public API contract. This is a breaking change; please ensure API consumers are notified.

[Copilot]

The MapFlowDirection signature update on MacCatalyst is a breaking API change. Ensure that documentation and clients targeting MacCatalyst are updated accordingly.

[jsuarezruiz]

Pending snapshot on Windows.

[jsuarezruiz]

Running a build.

[SyedAbdulAzeemSF4852]

@jsuarezruiz , I've updated the test case and added snapshots for iOS and Android. I will add the missing snap in the next CI run.

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jsuarezruiz]

@SyedAbdulAzeemSF4852 Could you rebase and fix the conflicts? Thanks in advance.

[SyedAbdulAzeemSF4852]

@SyedAbdulAzeemSF4852 Could you rebase and fix the conflicts? Thanks in advance.

@jsuarezruiz , Rebased the branch as suggested.

[jsuarezruiz]

/azp run MAUI-UITests-public

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[MauiBot]

🤖 AI Summary

📊 Expand Full Review — c04b33f · Updated and added snapshot baselines

---

🔍 Pre-Flight — Context & Validation

---

Issue: #30065 - [iOS] DatePicker FlowDirection Not Working on iOS
PR: #30193 - [iOS] Fix for DatePicker FlowDirection Not Working on iOS
Platforms Affected: iOS, MacCatalyst
Files Changed: 8 implementation, 2 test (+4 snapshot files)

Key Findings

• Root Cause: The MapFlowDirection partial method declaration in DatePickerHandler.cs used DatePickerHandler (concrete class) instead of IDatePickerHandler (interface). The mapper PropertyMapper registers MapFlowDirection as Action<IDatePickerHandler, IDatePicker>, so the concrete-typed implementation didn't match and the system fell through to the no-op base ViewHandler.MapFlowDirection.
• Fix Part 1: Changed signature to IDatePickerHandler in 3 files: DatePickerHandler.cs (partial declaration), DatePickerHandler.iOS.cs, and DatePickerHandler.MacCatalyst.cs.
• Fix Part 2: Implemented UpdateTextAlignment in DatePickerExtensions.cs to set text alignment based on the view's EffectiveUserInterfaceLayoutDirection after UpdateFlowDirection is called.
• PublicAPI change: Old DatePickerHandler signature removed from Shipped.txt; marked as REMOVED and new IDatePickerHandler signature added to Unshipped.txt for both iOS and MacCatalyst.
• Test: UI test with screenshot verification; wrapped in #if TEST_FAILS_ON_CATALYST — runs on iOS, Android, Windows. Taps toggle button then verifies screenshot.
• Note: TimePickerHandler.iOS.cs has the same bug (still uses TimePickerHandler concrete class in MapFlowDirection), but that is outside this PR's scope.
• MacCatalyst gap: DatePickerHandler.MacCatalyst.cs has the signature fixed, but the body is still empty — no call to UpdateFlowDirection or UpdateTextAlignment. The issue title says iOS but label also includes platform/macos.

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
PR	PR #30193	Change signature to IDatePickerHandler + implement UpdateTextAlignment using EffectiveUserInterfaceLayoutDirection	✅ PASSED (Gate)	8 files	Original PR

---

🔧 Fix — Analysis & Comparison

---

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
PR	PR #30193	Change signature to IDatePickerHandler + UpdateTextAlignment via EffectiveUserInterfaceLayoutDirection	✅ PASS (Gate)	8 files	Original PR; includes PublicAPI tracking
1	claude-opus-4.6	Lambda-in-Mapper bypass + SemanticContentAttribute-based alignment	✅ PASS	2 files	Avoids API signature change; minimal footprint
2	claude-sonnet-4.6	Signature fix (IDatePickerHandler) + UpdateTextAlignment via datePicker.FlowDirection (MAUI model)	✅ PASS	6 files	Reads from MAUI model; MatchParent defaults to LTR
3	gpt-5.3-codex	Mapper bridge method (IDatePickerHandler bridge casts to DatePickerHandler) + EffectiveFlowDirection	✅ PASS	3 files	Keeps old signature; adds bridge overload
4	gpt-5.4 (gemini unavailable)	Reactive via PropertyChanged + MovedToWindow subscription	✅ PASS	2 files	Event-driven approach; more complex lifecycle

Cross-Pollination

Model	Round	New Ideas?	Details
claude-opus-4.6	2	No	All fix strategies (signature fix, lambda, bridge, reactive, alignment source variants) exhaustively covered

Exhausted: Yes
Selected Fix: PR's fix — Correct approach: fixes the real root cause (wrong type in partial signature), implements UpdateTextAlignment using the native UIKit layout direction (most reliable for MatchParent cases), and properly tracks the public API change. The 2-file alternatives work but leave the partial method signatures inconsistent with every other handler method. The reactive approach (Attempt 4) is unnecessarily complex for a simple signature fix. The PR's approach matches the established MAUI handler pattern.

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📋 Report — Final Recommendation

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✅ Final Recommendation: APPROVE

Phase Status

Phase	Status	Notes
Pre-Flight	✅ COMPLETE	Issue #30065, iOS DatePicker FlowDirection, 8 impl + 2 test files
Gate	✅ PASSED	ios — ValidateDatePickerFlowDirection passes with fix, fails without
Try-Fix	✅ COMPLETE	4 attempts, all passing; PR's fix selected as best
Report	✅ COMPLETE

Summary

PR #30193 correctly fixes a long-standing iOS bug where DatePicker.FlowDirection had no effect. The fix addresses the root cause directly and follows established MAUI handler patterns. Gate passed, and 4 independent alternative fix approaches all confirmed the fix direction is sound. Selected Fix: PR.

Root Cause

The MapFlowDirection partial method was declared with a concrete DatePickerHandler parameter type in both DatePickerHandler.cs (the shared partial declaration) and the iOS/MacCatalyst implementations. The PropertyMapper registers handlers as Action<IDatePickerHandler, IDatePicker>, so C#'s method group resolution couldn't match MapFlowDirection(DatePickerHandler, IDatePicker) to the expected delegate type. This caused the mapper to silently skip the iOS-specific implementation and fall back to ViewHandler.MapFlowDirection, which only updates SemanticContentAttribute for layout direction but does not update text alignment on the native MauiDatePicker text field.

Additionally, UpdateTextAlignment was a TODO stub that did nothing.

Fix Quality

Strengths:

• Fixes the actual root cause (wrong parameter type in partial signature) rather than working around it
• The UpdateTextAlignment implementation reads EffectiveUserInterfaceLayoutDirection from the native view after UpdateFlowDirection has already set SemanticContentAttribute — this correctly handles all three FlowDirection values including MatchParent (which inherits from UIKit parent context)
• PublicAPI tracking is properly done: old signature removed from Shipped.txt, *REMOVED* entry and new signature added to Unshipped.txt for both iOS and MacCatalyst
• UI test with screenshot verification follows the standard pattern; #if TEST_FAILS_ON_CATALYST guard is appropriate (linked to issue [Mac] FlowDirection Property of DatePicker Is Not Functioning as Expected #30163)
• Snapshot files present for iOS, Android, and Windows

Minor observations (non-blocking):

• DatePickerHandler.MacCatalyst.cs has the signature fixed but the body remains empty — this is pre-existing behavior (MacCatalyst DatePicker uses UIDatePicker directly with different layout semantics), and the issue title is specific to iOS
• TimePickerHandler.iOS.cs has an identical root-cause bug (TimePickerHandler instead of ITimePickerHandler) and UpdateTextAlignment is still a TODO there — this is out of scope but worth a follow-up issue
• Try-Fix confirmed that reading datePicker.FlowDirection (MAUI model) or SemanticContentAttribute would also work, but EffectiveUserInterfaceLayoutDirection is the most semantically correct because it reflects UIKit's resolved direction after UpdateFlowDirection runs, properly handling MatchParent cases

---

[kubaflo]

Could you please review the AI's summary?

[MauiBot]

🚦 Gate - Test Before and After Fix

📊 Expand Full Gate — c04b33f · Updated and added snapshot baselines

---

Gate Result: ✅ PASSED

Platform: IOS · Base: main · Merge base: 794a9fa6

Test	Without Fix (expect FAIL)	With Fix (expect PASS)
🖥️ Issue30065 Issue30065	✅ FAIL — 203s	✅ PASS — 88s

🔴 Without fix — 🖥️ Issue30065: FAIL ✅ · 203s

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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 00:00:00.13]   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
>>>>> 4/3/2026 7:18:18 AM FixtureSetup for Issue30065(iOS)
>>>>> 4/3/2026 7:18:21 AM ValidateDatePickerFlowDirection Start
>>>>> 4/3/2026 7:18:23 AM ValidateDatePickerFlowDirection Stop
>>>>> 4/3/2026 7:18:23 AM Log types: syslog, crashlog, performance, safariConsole, safariNetwork, server
  Failed ValidateDatePickerFlowDirection [2 s]
  Error Message:
   VisualTestUtils.VisualTestFailedException : 
Snapshot different than baseline: ValidateDatePickerFlowDirection.png (2.09% 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.Issue30065.ValidateDatePickerFlowDirection() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue30065.cs:line 22
   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

Total tests: 1
     Failed: 1
Test Run Failed.
 Total time: 1.0128 Minutes

🟢 With fix — 🖥️ Issue30065: PASS ✅ · 88s

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  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13736351
  Microsoft.AspNetCore.Components.WebView.Maui -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Microsoft.AspNetCore.Components.WebView.Maui/Debug/net10.0-ios26.0/Microsoft.AspNetCore.Components.WebView.Maui.dll
  Controls.Foldable -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.Foldable/Debug/net10.0-ios26.0/Microsoft.Maui.Controls.Foldable.dll
  Controls.Xaml -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.Xaml/Debug/net10.0-ios26.0/Microsoft.Maui.Controls.Xaml.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13736351
  Controls.Maps -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.Maps/Debug/net10.0-ios26.0/Microsoft.Maui.Controls.Maps.dll
  Detected signing identity:
    Code Signing Key: "" (-)
    Provisioning Profile: "" () - no entitlements
    Bundle Id: com.microsoft.maui.uitests
    App Id: com.microsoft.maui.uitests
  Controls.TestCases.HostApp -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.TestCases.HostApp/Debug/net10.0-ios/iossimulator-arm64/Controls.TestCases.HostApp.dll
  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]
    1 Warning(s)
    0 Error(s)

Time Elapsed 00:00:45.23
  Determining projects to restore...
  Restored /Users/cloudtest/vss/_work/1/s/src/Graphics/src/Graphics/Graphics.csproj (in 332 ms).
  Restored /Users/cloudtest/vss/_work/1/s/src/Controls/src/BindingSourceGen/Controls.BindingSourceGen.csproj (in 377 ms).
  Restored /Users/cloudtest/vss/_work/1/s/src/Essentials/src/Essentials.csproj (in 379 ms).
  Restored /Users/cloudtest/vss/_work/1/s/src/Controls/src/Core/Controls.Core.csproj (in 403 ms).
  Restored /Users/cloudtest/vss/_work/1/s/src/Core/src/Core.csproj (in 420 ms).
  8 of 13 projects are up-to-date for restore.
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13736351
  Controls.CustomAttributes -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.CustomAttributes/Debug/net10.0/Controls.CustomAttributes.dll
  Graphics -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Graphics/Debug/net10.0/Microsoft.Maui.Graphics.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13736351
  Essentials -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Essentials/Debug/net10.0/Microsoft.Maui.Essentials.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13736351
  Core -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Core/Debug/net10.0/Microsoft.Maui.dll
  Controls.BindingSourceGen -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.BindingSourceGen/Debug/netstandard2.0/Microsoft.Maui.Controls.BindingSourceGen.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13736351
  Controls.Core -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.Core/Debug/net10.0/Microsoft.Maui.Controls.dll
  UITest.Core -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/UITest.Core/Debug/net10.0/UITest.Core.dll
  VisualTestUtils -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/VisualTestUtils/Debug/netstandard2.0/VisualTestUtils.dll
  UITest.Appium -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/UITest.Appium/Debug/net10.0/UITest.Appium.dll
  UITest.NUnit -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/UITest.NUnit/Debug/net10.0/UITest.NUnit.dll
  VisualTestUtils.MagickNet -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/VisualTestUtils.MagickNet/Debug/netstandard2.0/VisualTestUtils.MagickNet.dll
  UITest.Analyzers -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/UITest.Analyzers/Debug/netstandard2.0/UITest.Analyzers.dll
  Controls.TestCases.iOS.Tests -> /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.TestCases.iOS.Tests/Debug/net10.0/Controls.TestCases.iOS.Tests.dll
Test run for /Users/cloudtest/vss/_work/1/s/artifacts/bin/Controls.TestCases.iOS.Tests/Debug/net10.0/Controls.TestCases.iOS.Tests.dll (.NETCoreApp,Version=v10.0)
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 00:00:00.04]   Discovering: Controls.TestCases.iOS.Tests
[xUnit.net 00:00:00.13]   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
>>>>> 4/3/2026 7:19:47 AM FixtureSetup for Issue30065(iOS)
>>>>> 4/3/2026 7:19:51 AM ValidateDatePickerFlowDirection Start
>>>>> 4/3/2026 7:19:52 AM ValidateDatePickerFlowDirection Stop
  Passed ValidateDatePickerFlowDirection [1 s]
NUnit Adapter 4.5.0.0: Test execution complete

Test Run Successful.
Total tests: 1
     Passed: 1
 Total time: 17.6654 Seconds

📁 Fix files reverted (9 files)

• eng/pipelines/ci-copilot.yml
• src/Core/src/Handlers/DatePicker/DatePickerHandler.MacCatalyst.cs
• src/Core/src/Handlers/DatePicker/DatePickerHandler.cs
• src/Core/src/Handlers/DatePicker/DatePickerHandler.iOS.cs
• src/Core/src/Platform/iOS/DatePickerExtensions.cs
• src/Core/src/PublicAPI/net-ios/PublicAPI.Shipped.txt
• src/Core/src/PublicAPI/net-ios/PublicAPI.Unshipped.txt
• src/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Shipped.txt
• src/Core/src/PublicAPI/net-maccatalyst/PublicAPI.Unshipped.txt

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