修改pageview为可左右滑动

lib/pages/tab_navigator.dart

@@ -167,7 +167,7 @@ _pages=[
           itemBuilder: (context, index) => _pages[index],
           itemCount: _pages.length,
           controller: _pageController,
-          physics: NeverScrollableScrollPhysics(),
+          // physics: NeverScrollableScrollPhysics(),
           onPageChanged: (index) {
             setState(() {
               _currentIndex = index;