[dart] 다른 화면 크기에 따라 Flutter 앱이 반응하도록 만드는 방법은 무엇입니까?

많은 연구와 테스트 끝에 현재 Android / iOS에서 Flutter로 변환중인 앱에 대한 솔루션을 개발했습니다.

Android와 iOS에서는 기본 글꼴 크기에 적용된 ‘Scaling Factor’를 사용하여 화면 크기에 상대적인 텍스트 크기를 렌더링했습니다.

이 문서는 매우 도움이되었다 : https://medium.com/flutter-community/flutter-effectively-scale-ui-according-to-different-screen-sizes-2cb7c115ea0a

Material Design 인쇄 스타일의 글꼴 크기를 얻기 위해 StatelessWidget을 만들었습니다. MediaQuery를 사용하여 장치 치수 가져 오기, 배율 계수 계산, 머티리얼 디자인 텍스트 크기 재설정. 위젯은 커스텀 머티리얼 디자인 테마를 정의하는 데 사용할 수 있습니다.

사용 된 에뮬레이터 :

• Pixel C-9.94 인치 태블릿
• Pixel 3-5.46 인치 휴대 전화
• iPhone 11 Pro Max-5.8 형 휴대폰

표준 글꼴 크기

크기가 조정 된 글꼴

set_app_theme.dart (SetAppTheme 위젯)

import 'package:flutter/material.dart';
import 'dart:math';

class SetAppTheme extends StatelessWidget {

  final Widget child;

  SetAppTheme({this.child});

  @override
  Widget build(BuildContext context) {

    final _divisor = 400.0;

    final MediaQueryData _mediaQueryData = MediaQuery.of(context);

    final _screenWidth = _mediaQueryData.size.width;
    final _factorHorizontal = _screenWidth / _divisor;

    final _screenHeight = _mediaQueryData.size.height;
    final _factorVertical = _screenHeight / _divisor;

    final _textScalingFactor = min(_factorVertical, _factorHorizontal);

    final _safeAreaHorizontal = _mediaQueryData.padding.left + _mediaQueryData.padding.right;
    final _safeFactorHorizontal = (_screenWidth - _safeAreaHorizontal) / _divisor;

    final _safeAreaVertical = _mediaQueryData.padding.top + _mediaQueryData.padding.bottom;
    final _safeFactorVertical = (_screenHeight - _safeAreaVertical) / _divisor;

    final _safeAreaTextScalingFactor = min(_safeFactorHorizontal, _safeFactorHorizontal);

    print('Screen Scaling Values:' + '_screenWidth: $_screenWidth');
    print('Screen Scaling Values:' + '_factorHorizontal: $_factorHorizontal ');

    print('Screen Scaling Values:' + '_screenHeight: $_screenHeight');
    print('Screen Scaling Values:' + '_factorVertical: $_factorVertical ');

    print('_textScalingFactor: $_textScalingFactor ');

    print('Screen Scaling Values:' + '_safeAreaHorizontal: $_safeAreaHorizontal ');
    print('Screen Scaling Values:' + '_safeFactorHorizontal: $_safeFactorHorizontal ');

    print('Screen Scaling Values:' + '_safeAreaVertical: $_safeAreaVertical ');
    print('Screen Scaling Values:' + '_safeFactorVertical: $_safeFactorVertical ');

    print('_safeAreaTextScalingFactor: $_safeAreaTextScalingFactor ');

    print('Default Material Design Text Themes');
    print('display4: ${Theme.of(context).textTheme.display4}');
    print('display3: ${Theme.of(context).textTheme.display3}');
    print('display2: ${Theme.of(context).textTheme.display2}');
    print('display1: ${Theme.of(context).textTheme.display1}');
    print('headline: ${Theme.of(context).textTheme.headline}');
    print('title: ${Theme.of(context).textTheme.title}');
    print('subtitle: ${Theme.of(context).textTheme.subtitle}');
    print('body2: ${Theme.of(context).textTheme.body2}');
    print('body1: ${Theme.of(context).textTheme.body1}');
    print('caption: ${Theme.of(context).textTheme.caption}');
    print('button: ${Theme.of(context).textTheme.button}');

    TextScalingFactors _textScalingFactors = TextScalingFactors(
        display4ScaledSize: (Theme.of(context).textTheme.display4.fontSize * _safeAreaTextScalingFactor),
        display3ScaledSize: (Theme.of(context).textTheme.display3.fontSize * _safeAreaTextScalingFactor),
        display2ScaledSize: (Theme.of(context).textTheme.display2.fontSize * _safeAreaTextScalingFactor),
        display1ScaledSize: (Theme.of(context).textTheme.display1.fontSize * _safeAreaTextScalingFactor),
        headlineScaledSize: (Theme.of(context).textTheme.headline.fontSize * _safeAreaTextScalingFactor),
        titleScaledSize: (Theme.of(context).textTheme.title.fontSize * _safeAreaTextScalingFactor),
        subtitleScaledSize: (Theme.of(context).textTheme.subtitle.fontSize * _safeAreaTextScalingFactor),
        body2ScaledSize: (Theme.of(context).textTheme.body2.fontSize * _safeAreaTextScalingFactor),
        body1ScaledSize: (Theme.of(context).textTheme.body1.fontSize * _safeAreaTextScalingFactor),
        captionScaledSize: (Theme.of(context).textTheme.caption.fontSize * _safeAreaTextScalingFactor),
        buttonScaledSize: (Theme.of(context).textTheme.button.fontSize * _safeAreaTextScalingFactor));

    return Theme(
      child: child,
      data: _buildAppTheme(_textScalingFactors),
    );
  }
}

final ThemeData customTheme = ThemeData(
  primarySwatch: appColorSwatch,
  // fontFamily: x,
);

final MaterialColor appColorSwatch = MaterialColor(0xFF3787AD, appSwatchColors);

Map<int, Color> appSwatchColors =
{
  50  : Color(0xFFE3F5F8),
  100 : Color(0xFFB8E4ED),
  200 : Color(0xFF8DD3E3),
  300 : Color(0xFF6BC1D8),
  400 : Color(0xFF56B4D2),
  500 : Color(0xFF48A8CD),
  600 : Color(0xFF419ABF),
  700 : Color(0xFF3787AD),
  800 : Color(0xFF337799),
  900 : Color(0xFF285877),
};

_buildAppTheme (TextScalingFactors textScalingFactors) {

  return customTheme.copyWith(

    accentColor: appColorSwatch[300],
    buttonTheme: customTheme.buttonTheme.copyWith(buttonColor: Colors.grey[500],),
    cardColor: Colors.white,
    errorColor: Colors.red,
    inputDecorationTheme: InputDecorationTheme(border: OutlineInputBorder(),),
    primaryColor: appColorSwatch[700],
    primaryIconTheme: customTheme.iconTheme.copyWith(color: appColorSwatch),
    scaffoldBackgroundColor: Colors.grey[100],
    textSelectionColor: appColorSwatch[300],
    textTheme: _buildAppTextTheme(customTheme.textTheme, textScalingFactors),
    appBarTheme: customTheme.appBarTheme.copyWith(
        textTheme: _buildAppTextTheme(customTheme.textTheme, textScalingFactors)),

//    accentColorBrightness: ,
//    accentIconTheme: ,
//    accentTextTheme: ,
//    appBarTheme: ,
//    applyElevationOverlayColor: ,
//    backgroundColor: ,
//    bannerTheme: ,
//    bottomAppBarColor: ,
//    bottomAppBarTheme: ,
//    bottomSheetTheme: ,
//    brightness: ,
//    buttonBarTheme: ,
//    buttonColor: ,
//    canvasColor: ,
//    cardTheme: ,
//    chipTheme: ,
//    colorScheme: ,
//    cupertinoOverrideTheme: ,
//    cursorColor: ,
//    dialogBackgroundColor: ,
//    dialogTheme: ,
//    disabledColor: ,
//    dividerColor: ,
//    dividerTheme: ,
//    floatingActionButtonTheme: ,
//    focusColor: ,
//    highlightColor: ,
//    hintColor: ,
//    hoverColor: ,
//    iconTheme: ,
//    indicatorColor: ,
//    materialTapTargetSize: ,
//    pageTransitionsTheme: ,
//    platform: ,
//    popupMenuTheme: ,
//    primaryColorBrightness: ,
//    primaryColorDark: ,
//    primaryColorLight: ,
//    primaryTextTheme: ,
//    secondaryHeaderColor: ,
//    selectedRowColor: ,
//    sliderTheme: ,
//    snackBarTheme: ,
//    splashColor: ,
//    splashFactory: ,
//    tabBarTheme: ,
//    textSelectionHandleColor: ,
//    toggleableActiveColor: ,
//    toggleButtonsTheme: ,
//    tooltipTheme: ,
//    typography: ,
//    unselectedWidgetColor: ,
  );
}

class TextScalingFactors {

  final double display4ScaledSize;
  final double display3ScaledSize;
  final double display2ScaledSize;
  final double display1ScaledSize;
  final double headlineScaledSize;
  final double titleScaledSize;
  final double subtitleScaledSize;
  final double body2ScaledSize;
  final double body1ScaledSize;
  final double captionScaledSize;
  final double buttonScaledSize;

  TextScalingFactors({

    @required this.display4ScaledSize,
    @required this.display3ScaledSize,
    @required this.display2ScaledSize,
    @required this.display1ScaledSize,
    @required this.headlineScaledSize,
    @required this.titleScaledSize,
    @required this.subtitleScaledSize,
    @required this.body2ScaledSize,
    @required this.body1ScaledSize,
    @required this.captionScaledSize,
    @required this.buttonScaledSize
  });
}

TextTheme _buildAppTextTheme(

    TextTheme _customTextTheme,
    TextScalingFactors _scaledText) {

  return _customTextTheme.copyWith(

    display4: _customTextTheme.display4.copyWith(fontSize: _scaledText.display4ScaledSize),
    display3: _customTextTheme.display3.copyWith(fontSize: _scaledText.display3ScaledSize),
    display2: _customTextTheme.display2.copyWith(fontSize: _scaledText.display2ScaledSize),
    display1: _customTextTheme.display1.copyWith(fontSize: _scaledText.display1ScaledSize),
    headline: _customTextTheme.headline.copyWith(fontSize: _scaledText.headlineScaledSize),
    title: _customTextTheme.title.copyWith(fontSize: _scaledText.titleScaledSize),
    subtitle: _customTextTheme.subtitle.copyWith(fontSize: _scaledText.subtitleScaledSize),
    body2: _customTextTheme.body2.copyWith(fontSize: _scaledText.body2ScaledSize),
    body1: _customTextTheme.body1.copyWith(fontSize: _scaledText.body1ScaledSize),
    caption: _customTextTheme.caption.copyWith(fontSize: _scaledText.captionScaledSize),
    button: _customTextTheme.button.copyWith(fontSize: _scaledText.buttonScaledSize),

  ).apply(bodyColor: Colors.black);
}

main.dart (데모 앱)

import 'package:flutter/material.dart';
import 'package:scaling/set_app_theme.dart';


void main() => runApp(MyApp());


class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {

    return MaterialApp(
      home: SetAppTheme(child: HomePage()),
    );
  }
}


class HomePage extends StatelessWidget {

  final demoText = '0123456789';

  @override
  Widget build(BuildContext context) {

    return SafeArea(
      child: Scaffold(
        appBar: AppBar(
          title: Text('Text Scaling with SetAppTheme',
            style: TextStyle(color: Colors.white),),
        ),
        body: SingleChildScrollView(
          child: Center(
            child: Padding(
              padding: const EdgeInsets.all(8.0),
              child: Column(
                children: <Widget>[
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.display4.fontSize,
                    ),
                  ),
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.display3.fontSize,
                    ),
                  ),
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.display2.fontSize,
                    ),
                  ),
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.display1.fontSize,
                    ),
                  ),
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.headline.fontSize,
                    ),
                  ),
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.title.fontSize,
                    ),
                  ),
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.subtitle.fontSize,
                    ),
                  ),
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.body2.fontSize,
                    ),
                  ),
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.body1.fontSize,
                    ),
                  ),
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.caption.fontSize,
                    ),
                  ),
                  Text(
                    demoText,
                    style: TextStyle(
                      fontSize: Theme.of(context).textTheme.button.fontSize,
                    ),
                  ),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}