fix(share): present share sheet from the topmost view controller on iOS

share/ios/Sources/SharePlugin/SharePlugin.swift

@@ -64,12 +64,28 @@ public class SharePlugin: CAPPlugin, CAPBridgedPlugin {
                 }
 
             }
-            if self?.bridge?.viewController?.presentedViewController != nil {
-                call.reject("Can't share while sharing is in progress")
-                return
+            // Present from the topmost presented view controller so the share sheet appears
+            // above any view controller the app has presented over the webview. With nothing
+            // presented this resolves to the bridge view controller, i.e. unchanged behaviour.
+            // A share is only in progress when a share sheet is already presented.
+            var presenter = self?.bridge?.viewController
+            while let presented = presenter?.presentedViewController {
+                if presented is UIActivityViewController {
+                    call.reject("Can't share while sharing is in progress")
+                    return
+                }
+                presenter = presented
+            }
+            // `setCenteredPopover` anchors to the bridge view controller's view, which is not in
+            // the presenter's hierarchy when presenting from a different view controller. Anchor
+            // the popover to the presenting view controller's own view instead, centered and
+            // without an arrow, matching `setCenteredPopover` behaviour.
+            if let popover = actionController.popoverPresentationController, let presenterView = presenter?.view {
+                popover.sourceView = presenterView
+                popover.sourceRect = CGRect(x: presenterView.bounds.midX, y: presenterView.bounds.midY, width: 0, height: 0)
+                popover.permittedArrowDirections = []
             }
-            self?.setCenteredPopover(actionController)
-            self?.bridge?.viewController?.present(actionController, animated: true, completion: nil)
+            presenter?.present(actionController, animated: true, completion: nil)
         }
     }
 }