bottomNavigationBar: CupertinoTabBar(
                // 底部导航
                backgroundColor: SQColor.white,
                activeColor: SQColor.blue,
                items: <BottomNavigationBarItem>[
                  BottomNavigationBarItem(
                      icon: (page == 0)//页面index
                          ? Image.asset('images/home_true_1.png')//选中时的图标
                          : Image.asset('images/home_false_1.png'),//未选中时的图标
                      title: Text('首页')),
                 ],
                onTap: onTap,
                currentIndex: page,
              ),