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xcrun agvtool new-version -all {new_build_number}

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agvtool mvers -terse | grep /Info.plist | cut -f 2 -d "="

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extension ListEx<E> on List<E> {
  List<E> separated(E separator) {
    return List<E>.generate(length * 2 - 1, (index) {
      final idx = index ~/ 2;
      return index.isEven ? this[idx] : separator;
    });
  }
}

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class Handler {
  Handler({
    this.increment,
  });

  final VoidCallback increment;
}

class MyApp extends StatelessWidget {
  @override

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class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final store = Store<AppState>(
      reducer,
      initialState: AppState.init(),
    );
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(

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class MyHomePage extends StatelessWidget {
  const MyHomePage({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Demo'),
      ),
      body: Center(

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),

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final navigatorKey = GlobalKey();

// ...

// Widget構成時
Navigator(
  key: navigatorKey,
  onGeneratedRoute: (settings) => route,
);

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static NavigatorState of(
 BuildContext context, {
 bool rootNavigator = false,
 bool nullOk = false,
}) {
 final NavigatorState navigator = rootNavigator
     ? context.rootAncestorStateOfType(const TypeMatcher<NavigatorState>())
     : context.ancestorStateOfType(const TypeMatcher<NavigatorState>());
 assert(() {
   if (navigator == null && !nullOk) {

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final controller = ItemScrollController();
final listener = ItemPositionsListener.create();

ScrollablePositionedList.builder(
 itemCount: _maxItemCount,
 itemScrollController: controller,
 itemPositionsListener: listener, // ItemPositionsListenerでスクロールを監視
 itemBuilder: (context, index) {
   return child;
 },