@
hst001 我昨天是用了差不多这样的联动滑动条 （没试 relese 版本） ，就是 Android studio （ flutter plugin ）自带的那个看帧数的工具 ， 真的是一大段红 （渲染耗时 超过 16ms ）
```
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@
override Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@
override _MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
double s = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
void setSVal(double v) {
setState(() {
s = v;
});
}
@
override Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
Slider(
min: 0,
max: 100,
value: s,
onChanged: setSVal,
),
CupertinoSlider(
min: 0,
max: 100,
value: s,
onChanged: setSVal,
),
Text('$s'),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
```
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