增加若干基础页面

lib/pages/tab/tab_logic.dart

@@ -0,0 +1,48 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+
+import '../../global.dart';
+import 'tab_state.dart';
+
+class TabLogic extends GetxController {
+  final TabState state = TabState();
+
+  @override
+  void onInit() {
+    super.onInit();
+    state.pageController = PageController(initialPage: state.currentPage);
+  }
+
+  @override
+  void onReady() {
+    // TODO: implement onReady
+    super.onReady();
+  }
+
+  @override
+  void onClose() {
+    // TODO: implement onClose
+    super.onClose();
+  }
+
+  @override
+  void dispose() {
+    state.pageController!.dispose();
+    super.dispose();
+  }
+
+  handlePageChanged(int page) {
+    state.currentPage = page;
+    update();
+  }
+
+  handleNavBarTap(int index) {
+    if (index == state.currentPage) return;
+    if (Global.isOfflineLogin && index != 0) {
+      Get.toNamed('/tab');
+      return;
+    }
+    state.pageController!.jumpToPage(index);
+  }
+}