Flutter中BottomSheet的height和borderRadius如何调整？

Question

I'm probably missing something obvious here, but my BottomSheet only takes up the bottom half the screen, even though the widgets in it take up more space. So now there is scrolling behavior inside the BottomSheet. I'd like to be able to increase the BottomSheet so that the user doesn't have to scroll as much.

I also want to add a borderRadius to the top of my BottomSheet, so that it looks more "modal"-y or "tab"-like.

Code:

void _showBottomSheet(BuildContext context) {
    showModalBottomSheet<Null>(
      context: context,
      builder: (BuildContext context) {
        return _bottomSheetScreen; // defined earlier on
      },
    );
}

I've tried:

showModalBottomSheet<Null>(
  context: context,
  builder: (BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        borderRadius: _borderRadius,
      ),
      height: 1000.0,
      child: _bottomSheetScreen,
    );
  },
);

but it seems like that only affects the contents inside the BottomSheet, and does not customize the BottomSheet itself.

Answer 1

Default height for bottomSheet is half the screenSize

If you want your bottomSheet to EXPAND according to your content DYNAMICALLY

use below code

showModalBottomSheet<dynamic>(
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
  return Wrap(
      children: <Widget>[...]
  )
 }
)

This will automatically expand the bottomSheet according to content inside.

For adding a radius on top of bottomSheet return below code to `bottomSheet'

Container(
  child: Container(
    decoration: new BoxDecoration(
      color: forDialog ? Color(0xFF737373) : Colors.white,
      borderRadius: new BorderRadius.only(
            topLeft: const Radius.circular(25.0),
            topRight: const Radius.circular(25.0))),
      child: yourWidget(),
   ),
)

Complete code meeting both requirements

showModalBottomSheet<dynamic>(
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
  return Wrap(
      children: <Widget>[
          Container(
                 child: Container(
                  decoration: new BoxDecoration(
                    color: forDialog ? Color(0xFF737373) : Colors.white,
                    borderRadius: new BorderRadius.only(
                          topLeft: const Radius.circular(25.0),
                          topRight: const Radius.circular(25.0))),
                    child: yourWidget(),
                 ),
              )
      ]
   )
 }
)

Answer 2

It's possible this way

showModalBottomSheet(
  context: context,
  isScrollControlled: true,
  backgroundColor: Colors.transparent,
  builder: (context) => Container(
    height: MediaQuery.of(context).size.height * 0.75,
    decoration: new BoxDecoration(
      color: Colors.white,
      borderRadius: new BorderRadius.only(
        topLeft: const Radius.circular(25.0),
        topRight: const Radius.circular(25.0),
      ),
    ),
    child: Center(
      child: Text("Modal content goes here"),
    ),
  ),
);

1. Set isScrollControlled: true and backgroundColor: Colors.transparent for the modal
2. Provide a Container with required height: as root widget to modal builder
3. Provide BoxDecoration with required borderRadius for the Container

Answer 3

You can use a Column Inside a SingleChildScrollView to dynamically change the height of bottom sheet and also it gets scrollable once it exceeds the available max height, make sure the isScrollControlled is set to true, And for the border radius the shape property will help you add the borderRadius to the bottomsheet. here's a dartpad example for the same

  Future<void> _showBottomSheet() async {
    return showModalBottomSheet(
      isScrollControlled: true,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(13)),
      backgroundColor: Colors.white,
      context: context,
      builder: (context) => SingleChildScrollView(
          child: Column(
              crossAxisAlignment: CrossAxisAlignment.center,
              children: List.generate(kBoxes, (index) => _squareBox(index)))),
    );
  }

Answer 4

Use showBottomSheet instead of showModalBottomSheet

Create global key and a listener

final _scaffoldKey = new GlobalKey<ScaffoldState>();
VoidCallback _showPersBottomSheetCallBack;

Write your method to show the sheet

  void _showBottomSheet() {
    setState(() {
      _showPersBottomSheetCallBack = null;
    });

    _scaffoldKey.currentState
        .showBottomSheet((context) {
      return new Container(
        height: MediaQuery.of(context).size.height-100.0,
        color: Colors.greenAccent,
        child: new Center(
          child: new Text("Hi BottomSheet"),
        ),
      );
    })
        .closed
        .whenComplete(() {
      if (mounted) {
        setState(() {
          _showPersBottomSheetCallBack = _showBottomSheet;
        });
      }
    });
  }

initialize the listener

void initState() {
    super.initState();
    _showPersBottomSheetCallBack = _showBottomSheet;
  }

Call the method wherever you required

new RaisedButton(
                  onPressed: _showPersBottomSheetCallBack,
                  child: new Text("Persistent"),
                ),

Hope it helps !

Answer 5

Lately I found an workaround for this. By setting the canvasColor property to Colors.transparent in your app's theme, we can make the BottomSheet's overlay disappear.

return new MaterialApp(
  title: 'MyApp',
  theme: new ThemeData(
    primarySwatch: Colors.blue,
    canvasColor: Colors.transparent,
  ),
  //...
);

Once you set this up, you may use ClipRRect or Decoration with rounded corners.

Answer 6

No need to wrap anything. Only set:

• isScrollControlled: true in showModalBottomSheet
• shrinkWrap: true, in ListView

Here is the minimal general code:

import 'package:flutter/material.dart';

Future<Widget> show123(BuildContext context) {
  return showModalBottomSheet<dynamic>(
      useRootNavigator: true,
      isScrollControlled: true,
      context: context,
      builder: (BuildContext bc) {
        return ListView(
          shrinkWrap: true,
          children: [
            ListItem(),
            ListItem(),
            ListItem(),
          ],
        );
      });
}

You can get inspired by my case which depends on the number of AlbumRow dynamically. If the height reaches the maximum, you can get to the bottom by scrolling.

import 'package:flutter/material.dart';

Future<Widget> showBottomSheet(BuildContext context) {
  return showModalBottomSheet<dynamic>(
      useRootNavigator: true,
      barrierColor: Colors.black.withOpacity(0.5),
      isScrollControlled: true,
      context: context,
      builder: (BuildContext bc) {
        return ConstrainedBox(
          constraints: BoxConstraints(maxHeight: MediaQuery.of(context).size.height * 0.9),
          child: Container(
            decoration: new BoxDecoration(
                color: Colors.blue, borderRadius: new BorderRadius.only(topLeft: const Radius.circular(25.0), topRight: const Radius.circular(25.0))),
            child: ListView(
              shrinkWrap: true,
              children: [
                Padding(
                  padding: const EdgeInsets.fromLTRB(30, 30, 30, 45),
                  child: Text(
                    'Choose Album',
                    textAlign: TextAlign.center,
                  ),
                ),
                AlbumRow(title: 'For Weekends arta iretnairstnaisetn aistn aisetn'),
                AlbumRow(title: 'Creative'),
                AlbumRow(title: 'Christmas'),
                AlbumRow(title: 'For Weekends arta iretnairstnaisetn aistn aisetn'),
              ],
            ),
          ),
        );
      });
}

Answer 7

Use the Code Below

Note : If You are using column then use mainAxisSize: MainAxisSize.min

// make isScrollControlled : true
// if using column then make - mainAxisSize: MainAxisSize.min

showModalBottomSheet<dynamic>(
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
  return YourWidget();
 }
)

Answer 8

In the above code by @Shyju Madathil you need to add key in scaffold to make it work

return new Scaffold(
  key: _scaffoldKey,
  ....

Answer 9

here is the simplest code working in 2021

 showModalBottomSheet(
      context: context,
      isScrollControlled: true,  // <-- make bottom sheet resize to content height
      shape: RoundedRectangleBorder(  // <-- for border radius
        borderRadius: BorderRadius.only(
          topLeft: Radius.circular(15.0),
          topRight: Radius.circular(15.0),
        ),
      ),
      builder: (BuildContext context) {
       return Container() // <-- any widget you want
      });

Answer 10

You can adjust the height by setting the height of your main container either by a constant ex : 800 or by using MediaQuery ex :

if i want to show only 2 /3 of the screen

MediaQuery.of(context).size.height -
      (MediaQuery.of(context).size.height / 3)

for the radius first you have to set the

 showModalBottomSheet(
                          backgroundColor: Colors.transparent,

and then you container color to White or any color you wanted , example :

return Container(
  decoration: BoxDecoration(
      color: Colors.white,
      borderRadius: BorderRadius.only(
          topLeft: const Radius.circular(16),
          topRight: const Radius.circular(16))),
  child:

Answer 11

You can adjust the height by setting isScrollControlled: true and wrapping the BottomSheet inside FractionallySizedBox . It would look something like this:

 showModalBottomSheet<void>(
    context: context,
    //This
    isScrollControlled: true,
    builder: (BuildContext context) {
      return StatefulBuilder(
          builder: (BuildContext context, StateSetter state) {
        return FractionallySizedBox(
            //Here specify the high of the BottomSheet
            heightFactor: 0.9,
            child:BottomSheet(
            .
            .
            .
            
            .
            .
            .
      ));
      });
    });

Answer 12

Based on Vicky's answer, Wrap could make alignments miserable. Use instead Column(mainAxisSize: MainAxisSize.min, children: [...]) in the widget. Implementing that in your example should look like:

void _showBottomSheet(BuildContext context) {
    showModalBottomSheet<Null>(
      context: context,
      builder: (BuildContext context) {
        return Column(
        mainAxisAxisSize: MainAxisSize.min,
        children: [
          _bottomSheetScreen
        ]); // defined earlier on
      },
    );
}

If you want to control the scrolls with swipes, then try setting isScrollControlled: true on the showModalBottomSheet() .

Answer 13

Simple way to do this:

showModalBottomSheet(
                      shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.only(
                          topRight: Radius.circular(15),
                          topLeft: Radius.circular(15),
                        ),
                      ),
                      context: context,
                      builder: (context) {
                        return Wrap(
                          children: [
                            Container(
                              height: 40,
                              child: Center(
                                child: Text(
                                  "Edit Profile",
                                  style: TextStyle(
                                    fontWeight: FontWeight.bold,
                                  ),
                                ),`
                              ),
                            ),                           
                          ],
                        );
                      });

Answer 14

For changing the height of bottomsheet it's better to use the bottomsheet's constraints and isScrollControlled properties.

Like this:

showModalBottomSheet(
  constraints: BoxConstraints.loose(Size(
            MediaQuery.of(context).size.width,
            MediaQuery.of(context).size.height * 0.75)), // <= this is set to 3/4 of screen size.
  isScrollControlled: true, // <= set to true. setting this without constrains may cause full screen bottomsheet.
  context: context,
  builder: (context) => yourWidget()
);

For border radius use the shape property:

showModalBottomSheet(
  shape: const RoundedRectangleBorder(
      borderRadius: BorderRadius.vertical(top: Radius.circular(45))), // <= set preferable radius.
  context: context,
  builder: (context) => yourWidget()
);

Answer 15

In my case, setting the 'isScrollable' parameter to "true" makes the bottomsheet go past halfway through the screen.

Answer 16

This is my solution.It can adjust height and has a max height.If the content over max height.It can be scrolled

 showModalBottomSheet<void>(
    context: context,
    isScrollControlled: true,
    backgroundColor: Colors.white,
    // elevation: 10,
    shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.only(
      topLeft: Radius.circular(12),
      topRight: Radius.circular(12),
    )),
    builder: (context) {
      return ConstrainedBox(
        constraints: const BoxConstraints(maxHeight: 300),
        child: SingleChildScrollView(
            scrollDirection: Axis.vertical,
            child: Column(
              children: List.generate(20, (index) => Text("data$index")),
            )),
      );
    },
  );