Flutter show Bottom Modal Sheet bove the Bottom Navigation Bar

Question

在下图中，我在单击“底部导航栏”项时添加了 showModalBottomSheet，但是 BottomNavigationBar 被模态 sheet 隐藏了，所以我想让它即使在底部也可见sheet 存在。谁能请任何人帮助我。

这是我的底部导航代码：

Widget _bottomNavigationBar() {
    return BottomNavigationBar(
        type: BottomNavigationBarType.fixed,
        key: scaffoldState,
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.branding_watermark_outlined),
            label: 'Brands',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.category),
            label: 'Category',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            label: 'Profile',
          )
        ],
        currentIndex: _selectedIndex,
        selectedItemColor: AppColors.blue,
        onTap: (newIndex) => {
              if (newIndex == 1)
                {showBrandsBottomSheet(context)}
              else if (newIndex == 2)
                {showCategoryBottomSheet(context)}
              else
                {
                  setState(() {
                    _selectedIndex = newIndex;
                  })
                }
            });
  }

这是我的底层模型代码 sheet:

showBrandsBottomSheet(BuildContext context) {
    return showModalBottomSheet<void>(
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.only(
            topLeft: Radius.circular(15.0), topRight: Radius.circular(15.0)),
      ),
      context: context,
      useRootNavigator: true,
      isScrollControlled: true,
      builder: (BuildContext _) {
        return Container(
          color: Colors.white,
          height: MediaQuery.of(context).size.height / 2,
          child: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.start,
              children: <Widget>[
                Padding(
                  padding: const EdgeInsets.only(right: 5, top: 3),
                  child: GestureDetector(
                    onTap: () {
                      Navigator.pop(context);
                    },
                    child: const Align(
                        alignment: Alignment.topRight,
                        child: Icon(Icons.close)),
                  ),
                ),
                Container(
                  color: Colors.white,
                  height: 350,
                  child: ListView.builder(
                    key: Key('builder ${_selected.toString()}'), //a
                    scrollDirection: Axis.vertical,
                    // shrinkWrap: true,
                    // physics: NeverScrollableScrollPhysics(),
                    itemCount: brandList.length,
                    itemBuilder: (BuildContext context, int index) {
                      return Theme(
                          data: Theme.of(context)
                              .copyWith(dividerColor: Colors.white),
                          child: ExpansionTile(
                            // tilePadding: const EdgeInsets.all(0),
                            key: Key(index.toString()), //attention
                            initiallyExpanded: index == _selected, //attention
                            collapsedIconColor: Colors.blue,
                            iconColor: Colors.blue,
                            backgroundColor: Colors.white,
                            title: Text(
                              brandList[index],
                              style: const TextStyle(
                                  fontSize: 13.0,
                                  color: Colors.black,
                                  fontWeight: FontWeight.w600),
                            ),
                            children: <Widget>[
                              Container(
                                color: Colors.blue[50],
                                child: Column(
                                  children: _buildExpandableBrands(brandList),
                                ),
                              ),
                            ],
                            onExpansionChanged: ((newState) {
                              if (newState) {
                                setState(() {
                                  const Duration(seconds: 20000);
                                  _selected = index;
                                });
                              } else {
                                setState(() {
                                  _selected = -1;
                                });
                              }
                            }),
                          ));
                    },
                  ),
                ),
              ],
            ),
          ),
        );
      },
    );
  }

Answer 1

设置 useRootNavigator=true.This 将在所有其他内容之上显示模型 sheet。

showModalBottomSheet(
     context: context,
     isScrollControlled: true,
     useRootNavigator: true,
     builder: (context) {
     return BottomBarView(
     );
});

Answer 2

最后，帮助我完成了这项工作。

这是我的工作代码：

Widget _bottomNavigationBar() {
    return BottomNavigationBar(
        type: BottomNavigationBarType.fixed,
        key: scaffoldState,
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.branding_watermark_outlined),
            label: 'Brands',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.category),
            label: 'Category',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            label: 'Profile',
          )
        ],
        currentIndex: _selectedIndex,
        selectedItemColor: AppColors.blue,
        onTap: (newIndex) => {
              if (newIndex == 1)
                {
                  _scaffoldKey.currentState?.showBottomSheet((_) => Container(
                        child: showBrandsBottomSheet(),
                      ))
                }
              else if (newIndex == 2)
                {
                  {
                    _scaffoldKey.currentState?.showBottomSheet((_) => Container(
                          child: showCategoryBottomSheet(),
                        ))
                  }
                }
              else
                {
                  setState(() {
                    _selectedIndex = newIndex;
                  })
                }
            });
  }

showBrandsBottomSheet:

showBrandsBottomSheet() {
    return Container(
      color: Colors.white,
      height: MediaQuery.of(context).size.height / 2,
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.start,
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.only(right: 5, top: 3),
              child: GestureDetector(
                onTap: () {
                  Navigator.pop(context);
                },
                child: const Align(
                    alignment: Alignment.topRight, child: Icon(Icons.close)),
              ),
            ),
            Container(
              color: Colors.white,
              height: 350,
              child: ListView.builder(
                key: UniqueKey(),
                scrollDirection: Axis.vertical,
                itemCount: brandList.length,
                itemBuilder: (BuildContext context, int index) {
                  cardKeyList.add(GlobalKey(debugLabel: "index :$index"));
                  return Theme(
                      data: Theme.of(context)
                          .copyWith(dividerColor: Colors.white),
                      child: ExpansionTileCard(
                        key: cardKeyList[index],
                        initiallyExpanded: false,
                        title: Text(
                          brandList[index],
                          style: const TextStyle(
                              fontSize: 13.0,
                              color: Colors.black,
                              fontWeight: FontWeight.w600),
                        ),
                        children: <Widget>[
                          Container(
                            color: Colors.blue[50],
                            child: Column(
                              children: _buildExpandableBrands(brandList),
                            ),
                          ),
                        ],
                        onExpansionChanged: (value) {
                          if (value) {
                            Future.delayed(const Duration(milliseconds: 200),
                                () {
                              for (var i = 0; i < cardKeyList.length; i++) {
                                if (index != i) {
                                  cardKeyList[i].currentState?.collapse();
                                }
                              }
                            });
                          }
                        },
                      ));
                },
              ),
            ),
          ],
        ),
      ),
    );
  }

现在开始显示在底部导航上方。

Flutter show Bottom Modal Sheet bove the Bottom Navigation Bar

Flutter show Bottom Modal Sheet bove the Bottom Navigation Bar

flutter

bottomnavigationview

bottom-sheet

flutter-showmodalbottomsheet