更新时间：2019年07月17日 11:24:40 转载 作者：早起的年轻人
这篇文章主要为大家详细介绍了flutter PageView实现左右滑动切换视图，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
本文实例为大家分享了flutter PageView左右滑动切换视图的具体代码，供大家参考，具体内容如下
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import
'dart:math'
;
import
'package:cached_network_image/cached_network_image.dart'
;
import
'package:flutter/cupertino.dart'
;
import
'package:flutter/material.dart'
;
import
'package:flutter_x/base/base_appbar_page.dart'
;
class
LeftPageViewPage
extends
StatefulWidget {
@override
State<StatefulWidget> createState() {
return
new
LeftPageViewPageState();
}
}
class
LeftPageViewPageState
extends
BaseAppBarPageState<LeftPageViewPage> {
@override
String buildInitState() {
buildBackBar(
"pageView"
, backIcon: Icons.arrow_back_ios);
return
null
;
}
final
_controller =
new
PageController();
static
const
_kDuration =
const
Duration(milliseconds:
300
);
static
const
_kCurve = Curves.ease;
final
List<Widget> _pages = <Widget>[
new
ConstrainedBox(
constraints:
const
BoxConstraints.expand(),
child:
new
CachedNetworkImage(
width:
double
.infinity,
height:
double
.infinity,
fit: BoxFit.fill,
imageUrl:
placeholder: (context, url) =>
new
SizedBox(
width:
24.0
,
height:
24.0
,
child:
new
CircularProgressIndicator(
strokeWidth:
2.0
,
),
),
errorWidget: (context, url, error) =>
new
Icon(Icons.error),
),
),
new
ConstrainedBox(
constraints:
const
BoxConstraints.expand(),
child:
new
CachedNetworkImage(
width:
double
.infinity,
height:
double
.infinity,
fit: BoxFit.fill,
imageUrl:
placeholder: (context, url) =>
new
SizedBox(
width:
24.0
,
height:
24.0
,
child:
new
CircularProgressIndicator(
strokeWidth:
2.0
,
),
),
errorWidget: (context, url, error) =>
new
Icon(Icons.error),
),
),
new
ConstrainedBox(
constraints:
const
BoxConstraints.expand(),
child:
new
Stack(
//Stack即层叠布局控件，能够将子控件层叠排列
//alignment：此参数决定如何去对齐没有定位（没有使用Positioned）或部分定位的子widget。所谓部分定位，在这里特指没有在某一个轴上定位：left、right为横轴，top、bottom为纵轴，只要包含某个轴上的一个定位属性就算在该轴上有定位。
alignment: AlignmentDirectional.topStart,
children: <Widget>[
new
CachedNetworkImage(
width:
double
.infinity,
height:
double
.infinity,
fit: BoxFit.fill,
placeholder: (context, url) => SizedBox(width:
24
,height:
25
,child: CircularProgressIndicator(strokeWidth:
2.0
,),),
errorWidget: (context, url, error) =>
new
Icon(Icons.error),
),
new
Align(
alignment: Alignment.bottomCenter,
child:
new
Container(
margin: EdgeInsets.only(bottom:
80.0
),
child: FlatButton(onPressed: (){}, child: Text(
"立即体验"
)) ,
),
),
],
)),
];
@override
Widget buildWidget(BuildContext context) {
// TODO: implement buildWidget
return
new
Stack(
children: <Widget>[
//pageViw
PageView.builder(
physics:
new
AlwaysScrollableScrollPhysics(),
controller: _controller,
itemBuilder: (BuildContext context,
int
index) {
return
_pages[index];
},
//条目个数
itemCount: _pages.length,
),
//圆点指示器
new
Positioned(
bottom:
0.0
,
left:
0.0
,
right:
0.0
,
child:
new
Container(
color: Colors.white,
padding:
const
EdgeInsets.all(
20.0
),
child:
new
Center(
child:
new
DotsIndicator(
controller: _controller,
itemCount: _pages.length,
onPageSelected: (
int
page) {
_controller.animateToPage(
page,
duration: _kDuration,
curve: _kCurve,
);
}),
),
),
),
],
);
}
}
class
DotsIndicator
extends
AnimatedWidget {
DotsIndicator({
this
.controller,
this
.itemCount,
this
.onPageSelected,
this
.color: Colors.red,
}) :
super
(listenable: controller);
/// The PageController that this DotsIndicator is representing.
final
PageController controller;
/// The number of items managed by the PageController
final
int
itemCount;
/// Called when a dot is tapped
final
ValueChanged<
int
> onPageSelected;
/// The color of the dots.
///
/// Defaults to `Colors.white`.
final
Color color;
// The base size of the dots
static
const
double
_kDotSize =
8.0
;
// The increase in the size of the selected dot
static
const
double
_kMaxZoom =
2.0
;
// The distance between the center of each dot
static
const
double
_kDotSpacing =
25.0
;
Widget _buildDot(
int
index) {
double
selectedness = Curves.easeOut.transform(
max(
0.0
,
1.0
- ((controller.page ?? controller.initialPage) - index).abs(),
),
);
double
zoom =
1.0
+ (_kMaxZoom -
1.0
) * selectedness;
return
new
Container(
width: _kDotSpacing,
child:
new
Center(
child:
new
Material(
color: color,
type: MaterialType.circle,
child:
new
Container(
width: _kDotSize * zoom,
height: _kDotSize * zoom,
child:
new
InkWell(
onTap: () => onPageSelected(index),
),
),
),
),
);
}
Widget build(BuildContext context) {
return
new
Row(
mainAxisAlignment: MainAxisAlignment.center,
children:
new
List<Widget>.generate(itemCount, _buildDot),
);
}
}
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。