【Flutter学习】基本组件之基本滑动PageView组件

一，概述

PageView 是一个滑动视图列表，它也是继承至 CustomScrollView 的。

二，构造函数

• 类命构造函数（PageView）
  
  • PageView　
    
    • 使用场景:创建一个可滚动列表
    • 构造函数　

        PageView({
          Key key,
          this.scrollDirection = Axis.horizontal,
          this.reverse = false,
          PageController controller,
          this.physics,
          this.pageSnapping = true,
          this.onPageChanged,
          List<Widget> children = const <Widget>[],
          this.dragStartBehavior = DragStartBehavior.start,
        }) : controller = controller ?? _defaultPageController,
             childrenDelegate = SliverChildListDelegate(children),
             super(key: key);

• 命名构造函数
  
  • PageView.builder
    • 使用场景:创建一个滚动列表，指定数量
    • 重要参数：

    • typedef IndexedWidgetBuilder = Widget Function(BuildContext context, int index);

      * @required IndexedWidgetBuilder itemBuilder ： 构建子控件
      * typedef IndexedWidgetBuilder = Widget Function(BuildContext context, int index); 构建子控件的数目

    • 构造函数
      

        PageView.builder({
          Key key,
          this.scrollDirection = Axis.horizontal,
          this.reverse = false,
          PageController controller,
          this.physics,
          this.pageSnapping = true,
          this.onPageChanged,
          @required IndexedWidgetBuilder itemBuilder,
          int itemCount,
          this.dragStartBehavior = DragStartBehavior.start,
        }) : controller = controller ?? _defaultPageController,
             childrenDelegate = SliverChildBuilderDelegate(itemBuilder, childCount: itemCount),
             super(key: key);

  • PageView.custom
    • 使用场景:创建一个可滚动的列表，自定义子项
      构造函
      
      
    • 重要参数：
      

      * final SliverChildDelegate childrenDelegate;使用代理的方式构建子类列表

    • 构造函数

    • PageView.custom({    Key key,
          this.scrollDirection = Axis.horizontal,
          this.reverse = false,
          PageController controller,
          this.physics,
          this.pageSnapping = true,
          this.onPageChanged,
          @required this.childrenDelegate,
          this.dragStartBehavior = DragStartBehavior.start,
        }) : assert(childrenDelegate != null),
             controller = controller ?? _defaultPageController,
             super(key: key);

三，参数解析

四，示例demo

• demo

import ‘package:flutter/material.dart‘;

void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: ‘Flutter Demo‘,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyPageHome(title: ‘pageViewDemo‘,),
    );
  }
}

class MyPageHome extends StatefulWidget {

  //属性
  String title;
  //构造函数
  MyPageHome({Key key,this.title}):super(key:key);

  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return new MyPageHomeState();
  }
}

class MyPageHomeState extends State<MyPageHome> {
  @override
  Widget build(BuildContext context) {
    
    return new Scaffold(
      appBar: new AppBar(
        title: new  Text(widget.title)
      ),

      body: new Center(
        child: new Container(
          width: 200,
          height: 200,
          child: new PageView(
            children: <Widget>[
              Image.network(‘https://ws1.sinaimg.cn/large/0065oQSqgy1fwgzx8n1syj30sg15h7ew.jpg‘),
              Image.network(‘https://ws1.sinaimg.cn/large/0065oQSqly1fw8wzdua6rj30sg0yc7gp.jpg‘),
              Image.network(‘https://ws1.sinaimg.cn/large/0065oQSqly1fw0vdlg6xcj30j60mzdk7.jpg‘),
              Image.network(‘https://ws1.sinaimg.cn/large/0065oQSqly1fuo54a6p0uj30sg0zdqnf.jpg‘),
            ],
          ),
        ),
      ),
    );
  }
}

• 效果图
  

五，官方文档　　

官方文档

【Flutter学习】基本组件之基本滑动PageView组件

原文：https://www.cnblogs.com/lxlx1798/p/11181295.html