颤动中的从右到左（RTL）

Question

我使用 Flutter 一个多星期了，想创建一个阿拉伯语（从右到左）应用程序。

我在看Internationalizing Flutter Apps，但是没有提到如何设置布局方向

那么，如何在 Flutter 中显示从右到左 (RTL) 布局？

Answer 1

您需要创建一个 Builder 并使用 TextDirection.rtl

将布局方向传递给它

new MaterialApp(
          title: 'Flutter RTL',
          color: Colors.grey,
          builder: (BuildContext context, Widget child) {
              return new Directionality(
                textDirection: TextDirection.rtl,
                child: new Builder(
                  builder: (BuildContext context) {
                    return new MediaQuery(
                      data: MediaQuery.of(context).copyWith(
                            textScaleFactor: 1.0,
                          ),
                      child: child,
                    );
                  },
                ),
              );
            },
          .
          .
          .
        );

Answer 2

你有两个选择：

1.在所有设备上强制设置语言环境（和方向）

-- 方法一： 本地化

将 flutter_localizations 包添加到您的 pubspec.yml

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter

然后

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

MaterialApp(
  localizationsDelegates: [
    GlobalCupertinoLocalizations.delegate,
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate,
  ],
  supportedLocales: [
    Locale("fa", "IR"), // OR Locale('ar', 'AE') OR Other RTL locales
  ],
  locale: Locale("fa", "IR") // OR Locale('ar', 'AE') OR Other RTL locales,
  .
  .
  .
);

-- 方法二：无本地化

MaterialApp(
  .
  .
  .
  builder: (context, child) {
    return Directionality(
      textDirection: TextDirection.rtl,
      child: child,
    );
  },
  .
  .
  .
);

2。根据设备区域设置布局方向（如果用户 phone 语言环境是 RTL 语言并且存在于 supportedLocales 中，则您的应用程序运行处于 RTL 模式，否则您的应用程序是 LTR )

将 flutter_localizations 包添加到您的 pubspec.yml

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter

然后

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

MaterialApp(
  localizationsDelegates: [
    GlobalCupertinoLocalizations.delegate,
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate,
  ],
  supportedLocales: [
    Locale("en", "US"),
    Locale("fa", "IR"), // OR Locale('ar', 'AE') OR Other RTL locales
  ],
  .
  .
  .
);

注意 : flutter 中的 rtl 语言是：

[
  'ar', // Arabic
  'fa', // Farsi
  'he', // Hebrew
  'ps', // Pashto
  'ur', // Urdu
];

Answer 3

如果您需要反向显示文本，只需将 textdirection 属性设置为 TextDirection.rtl。

TextField 小部件的示例代码，

TextField(
  textDirection: TextDirection.rtl,
  decoration: InputDecoration(
    labelText: "Enter Pashto Name",
  ),
),

文本小部件的示例代码，

    Text(
      "This text is in the other direction!"
      textDirection: TextDirection.rtl,
    ),

Answer 4

为整个应用设置RTL配置的最佳和最短方法。

void main() {
  runApp(
    MaterialApp(
      home: Directionality( // add this
        textDirection: TextDirection.rtl, // set this property 
        child: HomePage(),
      ),
    ),
  );
}

Answer 5

SfRangeSelector支持通过在Directionalitywidget中设置textDirection属性为rtl来改变widget在right-to-left方向的布局方向.

SfRangeValues _initialValues = SfRangeValues(4.0, 8.0);

@override
Widget build(BuildContext context) {
  return MaterialApp(
      home: Scaffold(
          body: Directionality(
            textDirection: TextDirection.rtl,
            child: Center(
              child: SfRangeSelector(
                min: 2.0,
                max: 10.0,
                interval: 1,
                showLabels: true,
                showTicks: true,
                initialValues: _initialValues,
                child: Container(
                    color: Colors.pink[200],
                    height: 150,
                 ),
              ),
            )
         ),
      )
  );
}

回答来自：https://help.syncfusion.com/flutter/range-selector/right-to-left

Answer 6

只需将此附加到您的 material 应用：

 builder: (BuildContext context, Widget child) {
              return new Directionality(
                textDirection: TextDirection.rtl,
                child: new Builder(
                  builder: (BuildContext context) {
                    return new MediaQuery(
                      data: MediaQuery.of(context).copyWith(
                            textScaleFactor: 1.0,
                          ),
                      child: child,
                    );
                  },
                ),
              );
            },

颤动中的从右到左（RTL）

right-to-left (RTL) in flutter

layout

direction

right-to-left

flutter