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)
),
),
),
);
}
}
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：