修复了课程表和发帖按钮

src/screens/home/HomeScreen.tsx

@@ -17,6 +17,7 @@ import {
   NativeSyntheticEvent,
   Alert,
   Clipboard,
+  Modal,
 } from 'react-native';
 import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
 import { useNavigation } from '@react-navigation/native';
@@ -33,6 +34,7 @@ import { Loading, EmptyState, Text, ImageGallery, ImageGridItem, ResponsiveGrid
 import { HomeStackParamList, RootStackParamList } from '../../navigation/types';
 import { useResponsive, useResponsiveSpacing } from '../../hooks/useResponsive';
 import { SearchScreen } from './SearchScreen';
+import { CreatePostScreen } from '../create/CreatePostScreen';
 
 type NavigationProp = NativeStackNavigationProp<HomeStackParamList, 'Home'> & NativeStackNavigationProp<RootStackParamList>;
 
@@ -88,6 +90,9 @@ export const HomeScreen: React.FC = () => {
   // 搜索显示状态（用于内嵌搜索页面）
   const [showSearch, setShowSearch] = useState(false);
   
+  // 发帖弹窗状态
+  const [showCreatePost, setShowCreatePost] = useState(false);
+  
   // 用于跟踪当前页面显示的帖子 ID，以便从 store 同步状态
   const postIdsRef = React.useRef<Set<string>>(new Set());
   const inFlightRequestKeysRef = React.useRef<Set<string>>(new Set());
@@ -144,7 +149,8 @@ export const HomeScreen: React.FC = () => {
     if (!isMobile) {
       return undefined;
     }
-    return insets.bottom + MOBILE_TAB_BAR_HEIGHT + MOBILE_TAB_FLOATING_MARGIN + MOBILE_FAB_GAP;
+    // 往底部导航栏靠近一个按钮的位置
+    return insets.bottom + MOBILE_TAB_BAR_HEIGHT + MOBILE_TAB_FLOATING_MARGIN + MOBILE_FAB_GAP - MOBILE_TAB_BAR_HEIGHT;
   }, [isMobile, insets.bottom]);
 
   const appendUniquePosts = useCallback((prevPosts: Post[], incomingPosts: Post[]) => {
@@ -398,9 +404,9 @@ export const HomeScreen: React.FC = () => {
     setShowImageViewer(true);
   };
 
-  // 跳转到发帖页面
+  // 跳转到发帖页面（使用 Modal 方式）
   const handleCreatePost = () => {
-    navigation.getParent()?.navigate('CreatePost');
+    setShowCreatePost(true);
   };
 
   // 渲染帖子卡片（列表模式）
@@ -733,6 +739,18 @@ export const HomeScreen: React.FC = () => {
         onClose={() => setShowImageViewer(false)}
         enableSave
       />
+
+      {/* 发帖弹窗 */}
+      <Modal
+        visible={showCreatePost}
+        animationType="slide"
+        presentationStyle="pageSheet"
+        onRequestClose={() => setShowCreatePost(false)}
+      >
+        <CreatePostScreen
+          onClose={() => setShowCreatePost(false)}
+        />
+      </Modal>
     </SafeAreaView>
   );
 };