[iOS] - Enabled MultipleTouch Support for Handling Multi-Touch Points in GraphicsView #29895
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Hey there @@prakashKannanSf3972! 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
This PR enables multi-touch support in the iOS implementation of PlatformTouchGraphicsView to resolve pinch and zoom issues.
- Enabled the MultipleTouchEnabled property to allow multi-touch input on iOS.
- The change directly addresses the Apple documentation requirement for multi-touch capabilities.
| @@ -21,6 +21,7 @@ public PlatformTouchGraphicsView() | |||
| _proxy = new(this); | |||
| Opaque = false; | |||
| BackgroundColor = null; | |||
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This change correctly enables multi-touch support on iOS as per Apple's documentation. Consider adding an inline comment referencing the documentation URL to improve code maintainability and clarity.
Suggested change
| BackgroundColor = null; | |
| BackgroundColor = null; | |
| // Enable multi-touch support as per Apple's documentation: | |
| // https://developer.apple.com/documentation/uikit/uiview/1622459-multipletouchenabled |
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For more information about inflight process check https://github.com/dotnet/maui/wiki/Inflight-Branch-Process # .NET MAUI Release Notes - Inflight/Candidate Branch ## What's Changed ### MAUI Product Fixes * [iOS] CarouselView with CarouselViewHandler2 make app crash when Loop="False" and user scroll to the last position - fixes #26863 by @kubaflo in #26868 * Fixes Setting BackgroundColor to null does not actually changes BackgroundColor - fixes #22914 and #19576 by @jgonzalez-gft in #22917 * Fixed the picker title's color - fixes #16737 by @kubaflo in #23075 * [android] Fallback to default icons in SearchHandler by @aheubusch in #25067 * ScrollView's Background on iOS - fixes #24016 by @kubaflo in #25541 * [iOS] Enabled MultiTouch Support for Handling Multi-Touch Points in GraphicsView - fixes #29461 by @prakashKannanSf3972 in #29895 * Optimize converters for GridLength, ColumnDefinition, and RowDefinition - performance improvement by @emiller in #20048 * Add defensive IsAlive check to Android ViewExtensions.OnUnloaded - fixes #28051 by @jfversluis in #29934 * [Windows] Fixed runtime update issue for SearchBar PlaceholderColor and BackgroundColor - fixes #29962 by @Tamilarasan-Paranthaman in #29965 * Weak subscription to CanExecuteChange events - fixes #16124 by @sneumaier in #29837 * [iOS, Mac] Fix for downsized image retaining original dimensions in GraphicsView - fixes #30006 by @SyedAbdulAzeemSF4852 in #30007 * [Android] Prevent Picker from Gaining Focus on Touch - fixes #19739, #8546, #13503, #24862, #28121, #21704, #15394 by @bhavanesh2001 in #29068 * Fix CV1 GridItemsLayout centering single item AND Fix Empty view not resizing when bounds change - fixes #29595, #29634 by @albyrock87 in #29639 ### Testing * [Testing] Feature Matrix UITest Cases for Button by @TamilarasanSF4853 in #29803 * [Testing] Feature matrix UITest Cases for BoxView Control by @HarishKumarSF4517 in #29808 * [Testing] Enable HandlerDoesNotLeak for Button and ProgressBar by @bhavanesh2001 in #29896 * [Testing] Add Validation Test For Issue28051 On Android by @prakashKannanSf3972 in #30026 * [Testing] Fixed Test case failure in PR 30115 - [2025/06/23] Candidate by @HarishKumarSF4517 in #30136 ### Dependency Updates * Bump to 1.7.250606001 of WindowsAppSDK by @sneumaier in #29915 ### Housekeeping * [housekeeping] Update namespaces in HostApp and Shared tests projects by @bhavanesh2001 in #29904 * Update SetterSpecificity.cs Remove Extra Line From Bad Merge by @sneumaier in #29987 * Revert - Fixed the Label not sized correctly on Android by @Ahamed-Ali in #30023 * Revert "Fixes Setting BackgroundColor to null does not actually changes BackgroundColor #22914 (#22917)" by @mattleibow in #30031 * [create-pull-request] automated change by @github-actions[bot] in #30019 * [create-pull-request] automated change by @github-actions[bot] in #30043 * [create-pull-request] automated change by @github-actions[bot] in #30078 * Update Controls.TestCases.HostApp.csproj by @HarishKumarSF4517 in #30124 ## New Contributors * @albyrock87 made their first contribution in #29639 * @SyedAbdulAzeemSF4852 made their first contribution in #30007 * @emiller made their first contribution in #20048 * @jgonzalez-gft made their first contribution in #22917 * @aheubusch made their first contribution in #25067 **Full Changelog**: https://github.com/dotnet/maui/compare/main..inflight/candidate
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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!
Root Cause
On iOS,
UIViewhasMultipleTouchEnabledset tofalseby default, which causesPlatformTouchGraphicsViewto receive only a single touch point. As a result, multi-touch gestures like pinch and zoom do not function correctly.Description of Change
Added multi-touch support to the iOS implementation of
PlatformTouchGraphicsViewby enabling theMultipleTouchEnabledproperty.Documentation Reference:
falseand must be explicitly set totrueto receive multiple touches.Issues Fixed
Fixes #29461
Tested the behaviour in the following platforms
Test Case
Note : Appium currently does not support multi-finger touch actions, which makes it technically infeasible to automate a test case for this scenario. Therefore, a test case could not be added to validate this fix through automated UI testing.
Output
MultiTouch_Before_Fix.mov
MultiTouch_After_Fix.mov