反应本地平面列表

时间:2019-11-15 06:29:47

标签: javascript reactjs react-native fetch-api react-native-flatlist

我正在尝试使用React Native FlatList循环通过新闻页面的访存API响应,该页面将从包含Web视图元素的模式加载。一切似乎都正常,但是每次单击新闻文章时,它总是遍历所有文章,并给我最后一篇文章,而不是被点击的文章。如果我console.log(item.title),它将返回单击的文章标题,但不会加载它。我什至以状态传递了商品数据,但不确定自己做错了什么,请帮忙。请忽略多余的代码,因为我专注于在重构和删除未使用的CSS之前确保其正常工作。这是代码。让我知道您是否需要回购来发布链接。预先感谢。

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

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: Example01(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

List<StaggeredTile> _staggeredTiles = const <StaggeredTile>[
  const StaggeredTile.count(2, 2),
  const StaggeredTile.count(2, 1),
  const StaggeredTile.count(1, 2),
  const StaggeredTile.count(1, 1),
  const StaggeredTile.count(2, 2),
  const StaggeredTile.count(1, 2),
  const StaggeredTile.count(1, 1),
  const StaggeredTile.count(3, 1),
  const StaggeredTile.count(1, 1),
  const StaggeredTile.count(4, 1),
];

List<Widget> _tiles = const <Widget>[
  const _Example01Tile(Colors.green, AssetImage('assets/images/person.png')),
  const _Example01Tile(Colors.lightBlue, AssetImage('assets/images/person.png')),
  const _Example01Tile(Colors.amber, AssetImage('assets/images/person.png')),
  const _Example01Tile(Colors.brown, AssetImage('assets/images/person.png')),
  const _Example01Tile(Colors.deepOrange, AssetImage('assets/images/person.png')),
  const _Example01Tile(Colors.indigo, AssetImage('assets/images/person.png')),
  const _Example01Tile(Colors.red, AssetImage('assets/images/person.png')),
  const _Example01Tile(Colors.pink, AssetImage('assets/images/person.png')),
  const _Example01Tile(Colors.purple, AssetImage('assets/images/person.png')),
  const _Example01Tile(Colors.blue, AssetImage('assets/images/person.png')),
];

class Example01 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
        appBar: new AppBar(
          title: new Text('example 01'),
        ),
        body: new Padding(
            padding: const EdgeInsets.only(top: 12.0),
            child: new StaggeredGridView.count(
              crossAxisCount: 4,
              staggeredTiles: _staggeredTiles,
              children: _tiles,
              mainAxisSpacing: 4.0,
              crossAxisSpacing: 4.0,
              padding: const EdgeInsets.all(4.0),
            )));
  }
}

class _Example01Tile extends StatelessWidget {
  const _Example01Tile(this.backgroundColor, this.assetImage);

  final Color backgroundColor;
  final AssetImage assetImage;

  @override
  Widget build(BuildContext context) {
    return new Card(
      color: backgroundColor,
      child: new InkWell(
        onTap: () {},
        child: new Center(
          child: new Padding(
            padding: const EdgeInsets.all(4.0),
            child:Image(image: assetImage)
          ),
        ),
      ),
    );
  }
}

1 个答案:

答案 0 :(得分:0)

在您的模式中,您正在使用

<Text>{item.title}</Text>

代替

<Text>{this.state.modalArticleData.title}</Text>

对于WebView组件也是如此。

source={{ uri: this.state.modalArticleData.url }}

还有一件事情:

  • 从react-native而不是Import Flatlist react-native-gesture-handler