Widget _searchNavbar(BuildContext context){
    return TDNavBar(
      useDefaultBack: false,
      screenAdaptation: false,
      centerTitle: false,
      titleMargin: 0,
      titleWidget:  TDSearchBar(
        needCancel: false,
        autoHeight: true,
        padding: const EdgeInsets.fromLTRB(0, 2, 0, 2),
        placeHolder: '搜索预设文案',
        mediumStyle: true,
        style: TDSearchStyle.round,
        onTextChanged: (String text) {
          print('input：$text');
        },
      ),
      rightBarItems: [
        TDNavBarItem(icon: TDIcons.home,iconSize: 24),
        TDNavBarItem(icon: TDIcons.ellipsis,iconSize: 24)
      ]
    );
  }