rn-app/app/_layout.tsx

import FontAwesome from '@expo/vector-icons/FontAwesome';
import { DarkTheme, DefaultTheme, ThemeProvider } from '@react-navigation/native';
import { useFonts } from 'expo-font';
import { Stack } from 'expo-router';
import * as SplashScreen from 'expo-splash-screen';
import * as Updates from 'expo-updates';
import { useEffect } from 'react';
import { Alert, Platform } from 'react-native';
import 'react-native-reanimated';

import { useColorScheme } from '@/components/useColorScheme';

export {
  // Catch any errors thrown by the Layout component.
  ErrorBoundary,
} from 'expo-router';

export const unstable_settings = {
  // Ensure that reloading on `/modal` keeps a back button present.
  initialRouteName: '(tabs)',
};

// Prevent the splash screen from auto-hiding before asset loading is complete.
SplashScreen.preventAutoHideAsync();

export default function RootLayout() {
  const [loaded, error] = useFonts({
    SpaceMono: require('../assets/fonts/SpaceMono-Regular.ttf'),
    ...FontAwesome.font,
  });

  // Expo Router uses Error Boundaries to catch errors in the navigation tree.
  useEffect(() => {
    if (error) throw error;
  }, [error]);

  useEffect(() => {
    if (loaded) {
      SplashScreen.hideAsync();
    }
  }, [loaded]);

  // 检查热更新
  useEffect(() => {
    async function checkForUpdates() {
      if (__DEV__) {
        // 开发模式下不检查更新
        return;
      }

      try {
        const update = await Updates.checkForUpdateAsync();

        if (update.isAvailable) {
          await Updates.fetchUpdateAsync();

          // 提示用户重启应用以应用更新
          Alert.alert(
            '更新可用',
            '发现新版本，是否立即重启应用？',
            [
              {
                text: '稍后',
                style: 'cancel',
              },
              {
                text: '立即重启',
                onPress: async () => {
                  await Updates.reloadAsync();
                },
              },
            ]
          );
        }
      } catch (error) {
        // 处理更新检查错误
        console.error('检查更新失败:', error);
      }
    }

    checkForUpdates();
  }, []);

  if (!loaded) {
    return null;
  }

  return <RootLayoutNav />;
}

function RootLayoutNav() {
  const colorScheme = useColorScheme();

  return (
    <ThemeProvider value={colorScheme === 'dark' ? DarkTheme : DefaultTheme}>
      <Stack>
        <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
        <Stack.Screen name="modal" options={{ presentation: 'modal' }} />
      </Stack>
    </ThemeProvider>
  );
}