Load iOS dart bundle by URL fallback (#22997)

shell/platform/darwin/ios/framework/Source/FlutterDartProject.mm

@@ -43,6 +43,11 @@ flutter::Settings FLTDefaultSettingsForBundle(NSBundle* bundle) {
   if (bundle == nil) {
     bundle = [NSBundle bundleWithIdentifier:[FlutterDartProject defaultBundleIdentifier]];
   }
+  if (bundle == nil) {
+    // The bundle isn't loaded and can't be found by bundle ID. Find it by path.
+    bundle = [NSBundle bundleWithURL:[NSBundle.mainBundle.privateFrameworksURL
+                                         URLByAppendingPathComponent:@"App.framework"]];
+  }
   if (bundle == nil) {
     bundle = mainBundle;
   }
@@ -239,11 +244,16 @@ flutter::Settings FLTDefaultSettingsForBundle(NSBundle* bundle) {
     bundle = [NSBundle bundleWithIdentifier:[FlutterDartProject defaultBundleIdentifier]];
   }
   if (bundle == nil) {
-    bundle = [NSBundle mainBundle];
+    // The bundle isn't loaded and can't be found by bundle ID. Find it by path.
+    bundle = [NSBundle bundleWithURL:[NSBundle.mainBundle.privateFrameworksURL
+                                         URLByAppendingPathComponent:@"App.framework"]];
   }
   NSString* flutterAssetsName = [bundle objectForInfoDictionaryKey:@"FLTAssetsPath"];
-  if (flutterAssetsName == nil) {
+  if (bundle == nil) {
+    bundle = [NSBundle mainBundle];
     flutterAssetsName = @"Frameworks/App.framework/flutter_assets";
+  } else if (flutterAssetsName == nil) {
+    flutterAssetsName = @"flutter_assets";
   }
   return flutterAssetsName;
 }