Flutter开发(十三)—— PageView不一样的ViewPage(Android原生)

Flutter开发(十三)—— PageView不一样的ViewPage(Android原生)

组织数据,之前博客中有使用过。


class Animal {
  final String name;

  final String image;

  final String description;

  Animal({this.name, this.image, this.description});

  static List<Animal> allAnimal() {
    var animal = List<Animal>();

    animal.add(Animal(
      name: "老虎",
      description: "老虎屁股摸不得!",
      image: "https://dwz.cn/ghiCDaUp",
    ));

    animal.add(Animal(
      name: "小狗",
      description: "小狗啃骨头",
      image: "https://dwz.cn/Isoze9KN",
    ));

    animal.add(Animal(
      name: "小猫",
      description: "小猫吃鱼",
      image: "https://dwz.cn/x4dNzR6r",
    ));

    animal.add(Animal(
      name: "老鼠",
      description: "老鼠会打洞",
      image: "https://dwz.cn/1WeGTFA5",
    ));

    animal.add(Animal(
      name: "小鸡",
      description: "小鸡本米尺",
      image: "https://dwz.cn/SXhBUBCP",
    ));
    return animal;
  }
}

PageView的使用和属性介绍(看注释)

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

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

class MyApp extends StatelessWidget {
  List<Animal> animals = Animal.allAnimal();  //组织Animal 的List,提供展示数据

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false, //去掉右上角debug标签,并且没有写AppBar
      title: "Hello",
      home: Scaffold(
        // body: PageViewTest(),
        body: PageView.builder(
          pageSnapping: false, //默认true,即拖动不到一半弹回原页面;flase即,拖到哪里停在哪
          scrollDirection:
              Axis.vertical, //垂直切换还是水平切换(默认水平,Android原生ViewPage要费很大劲才能实现)
          reverse: false, //倒置,设置true页面顺序从后往前,默认false
          onPageChanged: (currentIndex) =>
              debugPrint('当前页面:$currentIndex'), //onPageChanged 监听页面改变,输出当前页面序号
          controller: PageController(
              initialPage: 1, //默认显示第几个页面(默认0)
              keepPage: false, //设置为true  initialPage才生效(默认true)
              viewportFraction: 1.0 //默认1,每个页面占可视窗的比例
              ),
          itemCount: Animal.allAnimal().length, //数量
          itemBuilder: _pageItemAnimal, //展示具体的Widget
        ),
      ),
    );
  }

  //定义一个 Stack  返回展示
  Widget _pageItemAnimal(BuildContext context, int index) {
    return Stack(
      children: <Widget>[
        SizedBox.expand(
          child: Image.network(
            animals[index].image,
            fit: BoxFit.cover,
          ),
        ),
        Positioned(
          bottom: 20.0,
          left: 20.0,
          child: Text(
            animals[index].description,
            style: TextStyle(color: Colors.deepOrangeAccent, fontSize: 30.0),
          ),
        ),
      ],
    );
  }
}

效果展示:(垂直、水平滑动只是一个属性设置: scrollDirection: Axis.vertical,)
超级丝滑!

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