优化侧边栏按钮边界检测逻辑

- 修复安全区域计算，正确处理刘海屏和底部手势区域
- 增加tabBar高度考虑，避免按钮与底部导航栏重合
- 优化默认位置逻辑，隐藏状态时使用屏幕中间位置

pages/index/index.js

@@ -141,24 +141,37 @@ Page({
     const moveY = e.touches[0].clientY;
     const diffY = moveY - this.data.startY;
     
-    // 如果移动距离超过20px，视为拖动
     if (Math.abs(diffY) > 20) {
       this.setData({
         isDragging: true
       });
       
-      // 更新按钮位置
-      let newTop = this.data.sidebarBtnTop + diffY * 2; // 转换为rpx
+      let newTop = this.data.sidebarBtnTop + diffY * 2;
       
-      // 限制按钮在屏幕范围内
-      const screenHeight = wx.getSystemInfoSync().screenHeight * 2; // 转换为rpx
-      const btnHeight = 180; // 按钮高度，单位rpx
-      const boundary = 300; // 边界值，限制拖动范围
+      const systemInfo = wx.getSystemInfoSync();
+      const screenHeight = systemInfo.screenHeight;
+      const safeArea = systemInfo.safeArea;
+      const btnHeight = 90;
+      const margin = 20;
+      const tabBarHeight = 70;
       
-      if (newTop < boundary) {
-        newTop = boundary;
-      } else if (newTop > screenHeight - btnHeight - boundary) {
-        newTop = screenHeight - btnHeight - boundary;
+      let minTop, maxTop;
+      
+      if (safeArea) {
+        minTop = safeArea.top + margin;
+        maxTop = safeArea.bottom - btnHeight - margin - tabBarHeight;
+      } else {
+        minTop = margin;
+        maxTop = screenHeight - btnHeight - margin - tabBarHeight;
+      }
+      
+      const minTopRpx = minTop * 2;
+      const maxTopRpx = maxTop * 2;
+      
+      if (newTop < minTopRpx) {
+        newTop = minTopRpx;
+      } else if (newTop > maxTopRpx) {
+        newTop = maxTopRpx;
       }
       
       this.setData({
@@ -195,12 +208,18 @@ Page({
     console.log('首页初始化')
     const savedBtnTop = wx.getStorageSync('sidebarBtnTop');
     const savedBtnHidden = wx.getStorageSync('sidebarBtnHidden');
-    if (savedBtnTop !== '') {
-      this.setData({
-        sidebarBtnTop: savedBtnTop,
-        sidebarBtnHidden: savedBtnHidden || false
-      });
+    const systemInfo = wx.getSystemInfoSync();
+    const screenHeight = systemInfo.screenHeight * 2;
+    
+    let defaultTop = screenHeight / 2;
+    if (savedBtnTop !== '' && savedBtnTop !== -100) {
+      defaultTop = savedBtnTop;
     }
+    
+    this.setData({
+      sidebarBtnTop: defaultTop,
+      sidebarBtnHidden: savedBtnHidden || false
+    });
     this.checkAndRestoreLoginStatus()
     this.loadGoods()
   },

pages/index/index.wxml

@@ -110,7 +110,7 @@
     
     <!-- 箭头按钮 -->
     <view class="sidebar-arrow" bindtap="toggleSidebarBtn">
-      <text class="arrow-icon {{sidebarBtnHidden ? 'arrow-right' : 'arrow-left'}}">▶</text>
+      <text class="arrow-icon {{sidebarBtnHidden ? 'arrow-right' : 'arrow-left'}}">《</text>
     </view>
   </view>