Flutter完整开发实战详解( Redux、主题、国际化) _ 掘金技术征文

由于篇幅限制，这里仅提供部分代码实例。

Redux状态管理

创建一个Counter动作：

abstract class CounterActions {
  static String increment = 'increment';
}

创建一个Reducer来处理Counter动作：

int counterReducer(int state, action) {
  if (action == CounterActions.increment) {
    return state + 1;
  }
  return state;
}

在main.dart中配置Redux并使用StoreProvider来包裹根Widget：

void main() {
  final store = Store<int>(counterReducer, initialState: 0);
  runApp(new FlutterReduxApp(store));
}
 
class FlutterReduxApp extends StatelessWidget {
  // ...
  Widget build(BuildContext context) {
    return StoreProvider<int>(
      store: store,
      child: MaterialApp(
        // ...
      ),
    );
  }
}

在CounterPage中使用StoreConnector连接State到UI：

class _CounterPageState extends State<CounterPage> {
  @override
  Widget build(BuildContext context) {
    return StoreConnector<int, VoidCallback>(
      converter: (Store<int> store) {
        return () => store.dispatch(CounterActions.increment);
      },
      builder: (BuildContext context, VoidCallback increment) {
        return Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text(
                'You have pushed the button this many times:',
              ),
              Text(
                '${context.watch<int>()}',
                style: Theme.of(context).textTheme.display1,
              ),
              RaisedButton(
                onPressed: increment,
                child: Text('Increment'),
              ),
            ],
          ),
        );
      },
    );
  }
}

主题和国际化

在pubspec.yaml中添加依赖：

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter     # 国际化
  intl: any         # 国际化

定义主题：

final ThemeData kIOSTheme = ThemeData(
  primarySwatch: Colors.orange,
  primaryColor: Colors.grey[100],
  primaryColorBrightness: Brightness.light,
);
 
final ThemeData kAndroidTheme = ThemeData(
  primarySwatch: Colors.blue,
);

在main.dart中使用主题：

void main() {
  runApp(new FlutterInternationalizationApp(ThemeData.light()));
}
 
class FlutterInternationalizationApp extends StatelessWidge