's'

app/_layout.tsx

@@ -20,26 +20,34 @@ export const unstable_settings = {
 // Prevent the splash screen from auto-hiding before asset loading is complete.
 SplashScreen.preventAutoHideAsync();
 
+/** 避免部分真机/构建环境下字体加载挂起或失败时永远停在 Expo 默认靶心启动图 */
+const SPLASH_FALLBACK_MS = 4000;
+
 export default function RootLayout() {
   const [loaded, error] = useFonts({
     SpaceMono: require('../assets/fonts/SpaceMono-Regular.ttf'),
   });
 
-  // Expo Router uses Error Boundaries to catch errors in the navigation tree.
   useEffect(() => {
-    if (error) throw error;
+    if (error) {
+      console.warn('[expo-font]', error);
+    }
   }, [error]);
 
   useEffect(() => {
     if (loaded) {
-      SplashScreen.hideAsync();
+      void SplashScreen.hideAsync();
     }
   }, [loaded]);
 
-  if (!loaded) {
-    return null;
-  }
+  useEffect(() => {
+    const t = setTimeout(() => {
+      void SplashScreen.hideAsync();
+    }, SPLASH_FALLBACK_MS);
+    return () => clearTimeout(t);
+  }, []);
 
+  // 不再在字体未就绪时 return null，否则 hideAsync 后会出现纯白屏且仍无界面
   return <RootLayoutNav />;
 }