Switch iOS Liquid glass rendering issue #34560

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1. Michal-MK

   added

   t/bugSomething isn't workingSomething isn't working

   on Mar 19, 2026
2. borrmann commented on Mar 19, 2026

   

   borrmann

   on Mar 19, 2026

   Contributor

   More actions

   We have seen this since the introduction of "liquid ass" 😂 support
3. Ahamed-Ali commented on Mar 19, 2026

   

   Ahamed-Ali

   on Mar 19, 2026

   Contributor

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   This issue has been validated in Visual Studio Code 1.112.0 with .NET MAUI 10.0.0 and 10.0.50. It was reproducible on iOS 26 platform comparing with the iOS native project.

   SwitchiOS26.zip

   Native

   SwitchNative.mov

   Maui

   SwitchMaui.mov
4. Ahamed-Ali

   added

   s/verifiedVerified / Reproducible Issue ready for Engineering TriageVerified / Reproducible Issue ready for Engineering Triage

   area-controls-switchSwitchSwitch

   s/triagedIssue has been reviewedIssue has been reviewed

   platform/ios

   version/iOS-26

   on Mar 19, 2026
5. sheiksyedm

   added this to the Backlog milestone on Mar 19, 2026
6. dmarjoram commented on May 21, 2026

   

   dmarjoram

   on May 21, 2026

   Last edited by dmarjoram

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   Please fix this! ❤️

   
7. huangshan-ios commented on Jul 10, 2026

   

   huangshan-ios

   on Jul 10, 2026

   More actions

   Hey Guys,
   iOS dev here. I've been fixing an issue related to this on Native iOS.

   The issue here, I believe, is that when we're updating the isOn state, maui trying to update the color again.

   Something like:

   • set isOn -> isOn changed -> update color (thumbTintColor, tintColor, onTintColor)

   ---

   Based on the investigation, I've confirmed the issue happened in that case:
   In SwitchHandler.iOS.cs, MapIsOn does two things when IsOn changes:

   1. Calls UpdateIsOn(handler)
   2. Then calls handler.PlatformView?.UpdateIsOn(view)

   But UpdateIsOn(handler) is not updating IsOn directly. It forces TrackColor to update:

   static void UpdateIsOn(ISwitchHandler handler)
   {
       handler.UpdateValue(nameof(ISwitch.TrackColor));
   }
   

   That means every ON/OFF state change re-runs MapTrackColor, which calls UpdateTrackColor. In SwitchExtensions.cs, that method writes into UISwitch.OnTintColor and the internal track subview background color when the switch is ON, and writes the internal background color when OFF.

   ---

   My suggested fix direction:

   public static void MapIsOn(ISwitchHandler handler, ISwitch view)
   {
       handler.PlatformView?.UpdateIsOn(view);
   }
   

   Then remove this helper if unused:

   static void UpdateIsOn(ISwitchHandler handler)
   {
       handler.UpdateValue(nameof(ISwitch.TrackColor));
   }
   

   But there is one important follow-up: if MAUI still needs custom TrackColor, make UpdateTrackColor apply color only when TrackColor actually changes, not every time IsOn changes. For iOS 26 especially, avoid touching OnTintColor, ThumbTintColor, or internal subview background during the native toggle animation.

   ❤️React with ❤️1Reacted by Max Borrmann
8. rmarinho

   added 4 commits that reference this issue on Aug 20, 2026

   Publish reproduction evidence for #34560 on ios

   104aa4a

   Publish reproduction evidence for #34560 on ios

   f8a7488

   Publish reproduction evidence for #34560 on ios

   c392814

   Publish reproduction evidence for #34560 on ios

   e03dcc3
9. kubaflo

   modified the milestones: Backlog, .NET 12 Planning on Nov 3, 2026
10. marcelomoresco

    added 3 commits that reference this issue on Nov 12, 2026

    Add dotnet#34560 PR screenshot before-after.png

    c20ff38

    Add dotnet#34560 PR screenshot before.gif

    4ad6a22

    Add dotnet#34560 PR screenshot after.gif

    df84611
11. kubaflo

    added 2 commits that reference this issue on Nov 13, 2026

    [iOS] Fix the track of a Switch covering its thumb when it is tapped …

    ...

    This issue will close once commit 7a2fbc1 is merged into the 'main' branch.

    7a2fbc1

    [iOS] Fix the track of a Switch covering its thumb when it is tapped …

    ...

    This issue will close once commit c5d73b9 is merged into the 'main' branch.

    c5d73b9