class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
double appBarHeight = 200.0;
@override
Widget build(BuildContext context) {
return new Stack(
children: <Widget>[
new Scaffold(
appBar: new PreferredSize(
preferredSize: new Size(MediaQuery.of(context).size.width, appBarHeight),
child: new Container(
color: Colors.blue,
child: new Container(
margin:const EdgeInsets.only(top: 30.0),
child: new Column(children: <Widget>[
new Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
new Row(
children: <Widget>[
new IconButton(
icon: new Icon(
Icons.arrow_back,
color: Colors.white,
),
onPressed: () {
Navigator.pop(context, false);
}
),
new Text(
"Controller Name",
style: new TextStyle(
fontWeight: FontWeight.bold,
color: Colors.white
),
),
],
),
],
),
]
)
)
)
),
body: new Center(
child: new Text('Hello!'),
),
),
new Positioned(
child: new FloatingActionButton(
child: new Icon(Icons.add),
onPressed: () {
print('FAB tapped!');
},
backgroundColor: Colors.blueGrey,
),
right: 10.0,
top: appBarHeight - 5.0,
)
],
);
}
}
2
我们可以通过使用堆栈来实现它
和代码片段看起来像这样
import 'package:flutter/material.dart';
import 'package:url_launcher/url_launcher.dart';
import 'dart:io';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Flutter Demo',
theme: new ThemeData(
primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new PreferredSize(
preferredSize: new Size(MediaQuery.of(context).size.width, 200.0),
child:
new Stack(
alignment: const FractionalOffset(0.98, 1.12),
children: <Widget>[new Container(
color: Colors.blue,
child: new Column(
children: <Widget>[
new Container(
margin: const EdgeInsets.fromLTRB(0.0, 20.0, 0.0, 0.0),
child: new Column(children: <Widget>[
new Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
new Row(
children: <Widget>[
new IconButton(
icon: new Icon(
Icons.arrow_back,
color: Colors.white,
),
onPressed: () {
Navigator.pop(context, false);
}),
new Text(
"Controller Name",
style: new TextStyle(
fontWeight: FontWeight.bold,
color: Colors.white),
),
],
),
],
),
]))
],
)
),new FloatingActionButton(onPressed: (){print("floating button Tapped");},child: new Icon(Icons.add),)],)
),
body: new Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child:
new Container(),
),
);
}
[![output][1]][1]}
2 回答
Siva Kumar 给出了很好的例子，但FAB的第二个不可点击 . 所以我在代码中做了一些更改，现在效果很好！
我们可以通过使用堆栈来实现它
和代码片段看起来像这样