refactor: 重构tabs栏

app/(tabs)/_layout.tsx

@@ -1,10 +1,13 @@
 import { Tabs } from 'expo-router';
+import Ionicons from "@expo/vector-icons/MaterialIcons"
 
 export default function TabLayout() {
   return (
     <Tabs>
-      <Tabs.Screen name="index" options={{ title: 'Home' }} />
-      <Tabs.Screen name="about" options={{ title: 'About' }} />
+      <Tabs.Screen name="index" options={{ title: '消息', tabBarIcon: ({ color }) => <Ionicons size={28} name="message" color={color} /> }} />
+      <Tabs.Screen name="contacts" options={{ title: '通讯录', tabBarIcon: ({ color }) => <Ionicons size={28} name="assignment-ind" color={color} /> }} />
+      <Tabs.Screen name="discover" options={{ title: '发现', tabBarIcon: ({ color }) => <Ionicons size={28} name="compass-calibration" color={color} /> }} />
+      <Tabs.Screen name="profile" options={{ title: '我', tabBarIcon: ({ color }) => <Ionicons size={28} name="person" color={color} /> }} />
     </Tabs>
   );
 }

app/(tabs)/about.tsx

@@ -1,5 +0,0 @@
-import { Text } from "react-native";
-
-export default function AboutRoute() {
-  return <Text>About Route</Text>;
-}

app/(tabs)/contacts.tsx

@@ -0,0 +1,3 @@
+export default function ContactsRoute() {
+  return <></>;
+}

app/(tabs)/discover.tsx

@@ -0,0 +1,3 @@
+export default function ContactsRoute() {
+  return <></>;
+}

app/(tabs)/index.tsx

@@ -1,5 +1,5 @@
 import { Text } from "react-native";
 
 export default function IndexRoute() {
-  return <Text>Index Route</Text>;
+  return <Text>Chat Route</Text>;
 }

app/(tabs)/profile.tsx

@@ -0,0 +1,3 @@
+export default function ProfileRoute() {
+  return <></>;
+}