flutter 实现无限滑屏
时间: 2023-09-07 18:14:59 浏览: 54
Flutter实现无限滑屏可以使用PageView组件和PageController控制器。
1. 创建一个PageView组件,并设置其控制器为一个PageController控制器:
```
PageController controller = PageController(initialPage: 0, keepPage: true);
PageView(
controller: controller,
scrollDirection: Axis.horizontal,
children: <Widget>[
// 页面1,
// 页面2,
// ...
// 页面n,
],
);
```
2. 设置PageController控制器的viewportFraction属性为0.8,以保证页面之间有一定的间隔:
```
controller = PageController(initialPage: 0, keepPage: true, viewportFraction: 0.8);
```
3. 在PageView组件的children中添加多个页面,并通过controller的jumpToPage方法实现无限滑动的效果:
```
PageView(
controller: controller,
scrollDirection: Axis.horizontal,
children: List.generate(pages.length, (index) {
return Container(child: pages[index]);
}),
onPageChanged: (index) {
// 当滑动到最后一页时,跳转到第一页
if (index == pages.length - 1) {
controller.jumpToPage(0);
}
// 当滑动到第一页之前,跳转到最后一页
else if (index == 0) {
controller.jumpToPage(pages.length - 1);
}
},
);
```
4. 在onPageChanged回调中,当滑动到最后一页时,跳转到第一页;当滑动到第一页之前时,跳转到最后一页,以实现无限滑动的效果。
完整代码示例:
```
class MyHomePage extends StatelessWidget {
final List<Widget> pages = [
Container(color: Colors.red),
Container(color: Colors.blue),
Container(color: Colors.green),
];
PageController controller = PageController(initialPage: 0, keepPage: true, viewportFraction: 0.8);
@override
Widget build(BuildContext context) {
return Scaffold(
body: PageView(
controller: controller,
scrollDirection: Axis.horizontal,
children: List.generate(pages.length, (index) {
return Container(child: pages[index]);
}),
onPageChanged: (index) {
if (index == pages.length - 1) {
controller.jumpToPage(0);
} else if (index == 0) {
controller.jumpToPage(pages.length - 1);
}
},
),
);
}
}
```