开发记录：底部导航代码块记录

代码块：

bottomNavigationBar: NavigationBarTheme(
        data: NavigationBarThemeData(
          indicatorColor: appcolor.black,
          backgroundColor: appcolor.white,
          labelBehavior: NavigationDestinationLabelBehavior.onlyShowSelected,
          height: 60.h,
          labelTextStyle: MaterialStateProperty.all(
            TextStyle(fontWeight: FontWeight.bold, fontSize: 10.sp),
          ),
        ),
        child: NavigationBar(
          animationDuration: Duration(milliseconds: 300),
          selectedIndex: pageindex,
          onDestinationSelected: (value) {
            setState(() {
              pageindex = value;
            });
            vibration(type: FeedbackType.light);
          },
          destinations: [
            NavigationDestination(
                icon: SvgPicture.asset(
                  'assets/images/home.svg',
                  color: pageindex == 0 ? appcolor.white : null,
                  width: iconsize,
                ),
                label: 'HOME'),
            NavigationDestination(
                icon: SvgPicture.asset('assets/images/Discovery.svg',
                    width: iconsize,
                    color: pageindex == 1 ? appcolor.white : null),
                label: 'DISCOVERY'),
            NavigationDestination(
                icon: SvgPicture.asset('assets/images/Profile.svg',
                    width: iconsize,
                    color: pageindex == 2 ? appcolor.white : null),
                label: 'PROFILE'),
          ],
        ),
      ),