iOS: Don't override scene delegate for CarPlay scenes

Qt for iOS apps that want to support CarPlay provide their own CarPlay
scene delegate that takes care of setting up the CarPlay template. We
should not get in the way of that, so bail out if we detect a CarPlay
scene.

It would make sense to always bail out of we detect an existing scene
delegate, class, or storyboard, but for visionOS the default scene
delegate is SwiftUI.AppSceneDelegate, so this needs more research.

Fixes: QTBUG-136138
Pick-to: 6.10 6.9 6.8
Change-Id: Icedea0cbeafc1c04ea56d8a7fc63b070087a609a
Reviewed-by: Volker Hilsheimer <[email protected]>

1 files changed, 13 insertions, 5 deletions

diff --git a/src/plugins/platforms/ios/qiosapplicationdelegate.mm b/src/plugins/platforms/ios/qiosapplicationdelegate.mm
index 088d48fc9ff..2e01f9bf202 100644
--- a/src/plugins/platforms/ios/qiosapplicationdelegate.mm
+++ b/src/plugins/platforms/ios/qiosapplicationdelegate.mm
@@ -21,14 +21,22 @@
 @implementation QIOSApplicationDelegate
 
 - (UISceneConfiguration *)application:(UIApplication *)application
-                          configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession
+                          configurationForConnectingSceneSession:(UISceneSession *)session
                           options:(UISceneConnectionOptions *)options
 {
-    qCDebug(lcQpaWindowScene) << "Configuring scene for" << connectingSceneSession
-        << "with options" << options;
+    qCDebug(lcQpaWindowScene) << "Configuring scene for" << session << "with options" << options;
+
+    auto *sceneConfig = session.configuration;
+
+    if ([sceneConfig.role hasPrefix:@"CPTemplateApplication"]) {
+        qCDebug(lcQpaWindowScene) << "Not touching CarPlay scene with role" << sceneConfig.role
+                                  << "and existing delegate class" << sceneConfig.delegateClass;
+        // FIXME: Consider ignoring any scene with an existing sceneClass, delegateClass, or
+        // storyboard. But for visionOS the default delegate is SwiftUI.AppSceneDelegate.
+    } else {
+        sceneConfig.delegateClass = QIOSWindowSceneDelegate.class;
+    }
 
-    auto *sceneConfig = connectingSceneSession.configuration;
-    sceneConfig.delegateClass = QIOSWindowSceneDelegate.class;
     return sceneConfig;
 }