bug(action-sheet, camera): on iPhone with Liquid Glass, action sheets show as a popover without the Cancel action #2630

Bug Report

Plugin(s)

• @capacitor/action-sheet 8.1.1 (also present on main, 8.1.2-nightly-20261104T150902.0 and 9.0.0-dev-2629-20261104T204338.0)
• @capacitor/camera: same pattern in showPrompt() (CameraSource.Prompt), not reproduced separately

Capacitor Version

Installed Dependencies:

  @capacitor/cli: 8.6.0
  @capacitor/core: 8.6.0
  @capacitor/android: 8.6.0
  @capacitor/ios: 8.6.0

Platform(s)

iOS on iPhone, with the Liquid Glass design.

• With @capacitor/action-sheet: iOS 27.0 simulator and an iPhone 11 on iOS 27.0.
• With the plain UIKit snippet below: iOS 26.3 and 27.0 simulators.

I haven't tested iPad. There the anchored popover is the intended presentation.

Current Behavior

ActionSheet.showActions() presents the sheet as a popover instead of the system action sheet. The popover is narrower, has no dimmed background, and has no Cancel button, even when an option has style: ActionSheetButtonStyle.Cancel.

showActions calls setCenteredPopover(alertController) on every device (ActionSheetPlugin.swift#L47). Core's setCenteredPopover (CAPPlugin.m#L149-L155) sets sourceView and sourceRect to the centre of the bridge view, with permittedArrowDirections = 0, regardless of idiom.

Without Liquid Glass, iPhone ignores that anchor. With Liquid Glass, UIKit presents an anchored .actionSheet as a popover on iPhone too, and hides the .cancel action, as it always has for popovers. The helper dates from ionic-team/capacitor#25 (2017), when the anchor only took effect on iPad.

UIDesignRequiresCompatibility = YES doesn't help when building with Xcode 27: our app sets it, yet its Xcode 27 builds use Liquid Glass and show the popover on iOS 27.

Expected Behavior

On iPhone, the system's standard (unanchored) action sheet: a wider card over a dimmed background, with its Cancel action.

The position doesn't change. On iOS 26.3 and 27.0, in an app built with Xcode 27, the system action sheet is centred too, not at the bottom of the screen as before Liquid Glass.

On iPad, the anchored popover stays as it is.

Code Reproduction

Build with Xcode 27, with or without UIDesignRequiresCompatibility, and run on an iPhone or iPhone simulator with iOS 27.

import { ActionSheet, ActionSheetButtonStyle } from '@capacitor/action-sheet';

await ActionSheet.showActions({
  title: 'Photo Options',
  options: [
    { title: 'Upload' },
    { title: 'Share' },
    { title: 'Cancel', style: ActionSheetButtonStyle.Cancel },
  ],
});

The same thing in plain UIKit, to isolate it from Capacitor:

let sheet = UIAlertController(title: "Videos", message: nil, preferredStyle: .actionSheet)
sheet.addAction(UIAlertAction(title: "From Videos", style: .default))
sheet.addAction(UIAlertAction(title: "Record", style: .default))
sheet.addAction(UIAlertAction(title: "Cancel", style: .cancel))
// What setCenteredPopover does:
sheet.popoverPresentationController?.sourceRect = CGRect(x: view.center.x, y: view.center.y, width: 0, height: 0)
sheet.popoverPresentationController?.sourceView = view
sheet.popoverPresentationController?.permittedArrowDirections = []
present(sheet, animated: true)
// iPhone with Liquid Glass: a popover without Cancel.
// Without the 3 anchor lines, or with `sourceView = nil` afterwards: the system action sheet with Cancel.

Other Technical Details

Xcode 27.0 (27A266a). iOS 26.3 and 27.0 simulator runtimes. All builds used Xcode 27 (iOS 27 SDK). Apps built with Xcode 26 without UIDesignRequiresCompatibility are likely affected too, but I haven't checked.

Additional Context

Screenshots of the UIKit snippet, from left to right:

1. iOS 26.3, anchored like setCenteredPopover
2. iOS 26.3, the same, then sourceView = nil
3. iOS 27.0, anchored like setCenteredPopover
4. iOS 27.0, the same, then sourceView = nil

Possible fixes:

• Plugins: skip setCenteredPopover for action sheets on iPhone (userInterfaceIdiom == .phone). @capacitor/camera showPrompt() (CameraPlugin.swift#L394) needs the same change.
• Or core: skip the anchor in setCenteredPopover on iPhone. That also covers third-party plugins that call it.

Keep the anchor on every other idiom: on iPad, presenting an action sheet without one raises an exception.

Workaround in an app: override present(_:animated:completion:) in the CAPBridgeViewController subclass, and on iPhone set popoverPresentationController?.sourceView = nil for UIAlertControllers with .actionSheet style before calling super.

No existing issue found: searched for setCenteredPopover, "action sheet" with "cancel", "popover" and "iOS 26", and "liquid glass".