更新時間：2019年07月17日 11:24:40 轉載 作者：早起的年輕人
這篇文章主要為大家詳細介紹了flutter PageView實現左右滑動切換視圖，具有一定的參考價值，感興趣的小伙伴們可以參考一下
本文實例為大家分享了flutter PageView左右滑動切換視圖的具體代碼，供大家參考，具體內容如下
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
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即層疊布局控件，能夠將子控件層疊排列
//alignment：此參數決定如何去對齊沒有定位（沒有使用Positioned）或部分定位的子widget。所謂部分定位，在這里特指沒有在某一個軸上定位：left、right為橫軸，top、bottom為縱軸，只要包含某個軸上的一個定位屬性就算在該軸上有定位。
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(
"立即體驗"
)) ,
),
),
],
)),
];
@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];
},
//條目個數
itemCount: _pages.length,
),
//圓點指示器
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),
);
}
}
|
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。