fix(iOS): header left and right layout on fabric

apps/src/tests/Test2231.tsx

@@ -0,0 +1,56 @@
+import { createNativeStackNavigator } from '@react-navigation/native-stack';
+import React, { useLayoutEffect, useState } from 'react';
+import { View } from 'react-native';
+
+import { SettingsSwitch, Square } from '../shared';
+import { NavigationContainer } from '@react-navigation/native';
+
+const SettingsScreen = ({ navigation }: any) => {
+  const [hasLeftItem, setHasLeftItem] = useState(false);
+
+  const square1 = (props: { tintColor?: string }) => (
+    <View style={{ gap: 8, flexDirection: 'row' }}>
+      {hasLeftItem && <Square {...props} color="green" size={20} />}
+      <Square {...props} color="green" size={20} />
+    </View>
+  );
+
+  const square2 = (props: { tintColor?: string }) => (
+    <Square {...props} color="red" size={20} />
+  );
+
+  useLayoutEffect(() => {
+    navigation.setOptions({
+      headerRight: square1,
+      headerTitle: undefined,
+      headerLeft: hasLeftItem ? square2 : undefined,
+      headerBackTitleVisible: false,
+    });
+  }, [navigation, hasLeftItem]);
+
+  return (
+    <SettingsSwitch
+      label="Left item"
+      value={hasLeftItem}
+      onValueChange={setHasLeftItem}
+    />
+  );
+};
+
+const Stack = createNativeStackNavigator();
+
+const App = () => (
+  <NavigationContainer>
+    <Stack.Navigator>
+      <Stack.Screen
+        name="Settings"
+        component={SettingsScreen}
+        options={{
+          headerTintColor: 'hotpink',
+        }}
+      />
+    </Stack.Navigator>
+  </NavigationContainer>
+);
+
+export default App;

apps/src/tests/index.ts

@@ -104,5 +104,6 @@ export { default as Test2184 } from './Test2184';
 export { default as Test2223 } from './Test2223';
 export { default as Test2227 } from './Test2227';
 export { default as Test2229 } from './Test2229';
+export { default as Test2231 } from './Test2231';
 export { default as TestScreenAnimation } from './TestScreenAnimation';
 export { default as TestHeader } from './TestHeader';

ios/RNSScreenStackHeaderSubview.mm

@@ -72,6 +72,9 @@ - (void)updateLayoutMetrics:(const react::LayoutMetrics &)layoutMetrics
         self);
   } else {
     self.bounds = CGRect{CGPointZero, frame.size};
+    // We're forcing the parent view to layout this subview with correct frame size,
+    // see: https://github.com/software-mansion/react-native-screens/pull/2248
+    [self.superview layoutIfNeeded];
   }
 }