Flutter

Question

我不知道如何通过循环生成多个ListTiles，例如for()。

我不知道 Flutter 如何渲染小部件，因为在 Angular 2 中只需在布局中插入 *ngFor 指令 (html)。

我在 Flutter 文档中找不到这样的主题。

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: "Myapp",
      home: new HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {

  @override
  Widget build(BuildContext context) => new Scaffold(
    appBar: new AppBar(
      backgroundColor: new Color(0xFF26C6DA),
    ),
    body: new ListView (
      children: <Widget>[
        new Card(
          child: new Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              const ListTile(
                leading: const Icon(Icons.album),
                title: const Text('The Enchanted Nightingale'),
                subtitle: const Text('Music by Julie Gable. Lyrics by Sidney Stein.'),
              ),
            ],
          ),
        ),
      ],
    )    
  );
}

Answer 1

List.generate() is useful for making small lists. For larger or infinite lists, use a ListView.builder() 而不是 ListView.

import 'package:flutter/material.dart';

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: "Myapp",
      home: new HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        backgroundColor: new Color(0xFF26C6DA),
      ),
      body: new ListView.builder(
        itemBuilder: (BuildContext context, int index) {
          return new Card(
            child: const ListTile(
              leading: const Icon(Icons.album),
              title: const Text('The Enchanted Nightingale'),
              subtitle: const Text(
                'Music by Julie Gable. Lyrics by Sidney Stein.',
              ),
            ),
          );
        },
      ),
    );
  }
}

Answer 2

这里是 List.generate 的例子：-

import 'package:flutter/material.dart';

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
      title: "Myapp",
      home: new HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: Text('List.generate demo'),
      ),
      body: new ListView(
        padding: const EdgeInsets.all(8),
        children: new List.generate(
          10,
          (index) => new ListTile(
            title: Text('Item $index'),
          ),
        ),
      ),
    );
  }
}

Flutter - ListTile 的循环

Flutter - Loops for ListTile

dart