Custom BottomNavigationBar in Flutter

Question

I tried to implement a custom bottom navigation bar. I use a pageview to navigate between the pages. Now the bottom navigation bar is not absolutely above the page view but cuts off part of the page view. Can anyone help me here?

Here is the associated code:

  Scaffold buildHomePage() {
    return Scaffold(
      body: PageView(
        children: <Widget>[
          PopularScreen(),
          DiscoverScreen(),
          ActivityScreen(),
          ProfileScreen()
        ],
        controller: pageController,
        onPageChanged: onPageChanged,
        physics: NeverScrollableScrollPhysics(),
      ),
      bottomNavigationBar: buildBottomNavigationBar(),
    );
  }

  Widget buildBottomNavigationBar() {
    return BottomAppBar(
          child: Container(
        height: 65,
        margin: EdgeInsets.only(left: 30, bottom: 40, right: 30),
        padding: EdgeInsets.all(8),
        decoration: BoxDecoration(
          boxShadow: [
            BoxShadow(
              color: Colors.black12,
              blurRadius: 5,
            )
          ],
          color: Colors.white,
          borderRadius: BorderRadius.circular(50),
        ),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: items.map((item) {
            var itemIndex = items.indexOf(item);
            return GestureDetector(
              onTap: () => onTap(itemIndex),
              child: _buildNavBarItem(item, pageIndex == itemIndex),
            );
          }).toList(),
        ),
      ),
    );
  }

Try · Accepted Answer · 2020-08-03 18:42:48Z

2

You can use the Stack Widget to position the your BottomNavigationBar on top of the PageView:

Scaffold(
  body: Stack(
    children: <Widget>[
      PageView(...),
      Align(
        alignment: Alignment.bottomCenter,
        child: buildBottomNavigationBar(pageController),
      ),
    ],
  ),
);

Then you can remove the BottomAppBar from the buildBottomNavigationBar() or set the elevation property to 0 and the color to Colors.transparent:

BottomAppBar(
  color: Colors.transparent,
  elevation: 0,
  child: ...
);

Result:

edited Aug 3, 2020 at 18:42

answered Aug 3, 2020 at 17:25

Try

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1 Comment

saibot Over a year ago

Thank you for your answer! Unfortunately the Pageview is still on top of the BottomNavigationBar. Did you also test it in your example with a pageview?

Alok · Accepted Answer · 2020-08-03 18:43:26Z

1

Your answer is Stack class, which will help you build your BottomNavigationBar on top of your PageView

Basic layout of the Page

Stack(
  children: [
    PageView(
      ....
    )

    Positioned(
       top: ..,
       left: ..,
       bottom: ..,
       right: ..,
       child: BottomNavigationBar()
    )
  ]
)

If that make sense to you

answered Aug 3, 2020 at 18:43

Alok

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