Flutter iOS风格滑块插件better_cupertino_slider的使用
Flutter iOS风格滑块插件better_cupertino_slider的使用
安装插件
首先，你需要在 pubspec.yaml 文件中添加以下依赖项：
dependencies:
better_cupertino_slider: ^1ersion^
然后运行以下命令来 安装插件：
flutter packages get
示例代码
下面是一个完整的示例代码，展示了如何使用 better_cupertino_slider 插件创建一个iOS风格的滑块。
import 'package:flutter/material.dart';
import 'package:better_cupertino_slider/better_cupertino_slider.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
[@override](/user/override)
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
double sliderValue = 2.5;
final double maxValue = 5.0;
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Plugin example app'),
),
body: Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: Text(
"Current Value : ${sliderValue.toStringAsFixed(2)}",
style: TextStyle(
color: Colors.redAccent,
),
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: Text("normal"),
),
Container(
constraints: BoxConstraints.expand(height: 44),
margin: EdgeInsets.symmetric(horizontal: 20),
child: BetterCupertinoSlider(
min: 0.0,
max: maxValue,
value: sliderValue,
configure: BetterCupertinoSliderConfigure(),
onChanged: (value) {
setState(() {
sliderValue = value;
});
},
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: Text("custom track and thumb"),
),
Container(
constraints: BoxConstraints.expand(height: 44),
margin: EdgeInsets.symmetric(horizontal: 20),
child: BetterCupertinoSlider(
min: 0.0,
max: maxValue,
value: sliderValue,
configure: BetterCupertinoSliderConfigure(
trackHorizontalPadding: 8.0,
trackHeight: 6.0,
trackLeftColor: Colors.greenAccent,
trackRightColor: Colors.redAccent,
),
onChanged: (value) {
setState(() {
sliderValue = value;
});
},
onChangeStart: (value) {},
onChangeEnd: (value) {},
),
),
Container(
constraints: BoxConstraints.expand(height: 44),
margin: EdgeInsets.symmetric(horizontal: 20),
child: BetterCupertinoSlider(
min: 0.0,
max: maxValue,
value: sliderValue,
configure: BetterCupertinoSliderConfigure(
trackHorizontalPadding: 8.0,
trackHeight: 4.0,
trackLeftColor: const Color(0xFFFF6B26),
trackRightColor: const Color(0xFFE3E9EF),
thumbRadius: 8.0,
thumbPainter: (canvas, rect) {
final RRect rrect = RRect.fromRectAndRadius(
rect,
Radius.circular(rect.shortestSide / 2.0),
);
const Color borderColor = Color(0x08000000);
// draw shadow
for (final BoxShadow shadow in kBetterSliderBoxShadows)
canvas.drawRRect(
rrect.shift(shadow.offset), shadow.toPaint());
// draw border
canvas.drawRRect(
rrect.inflate(0.5),
Paint()..color = borderColor,
);
// draw background
canvas.drawRRect(rrect, Paint()..color = Colors.white);
// draw center point
canvas.drawRRect(
rrect.deflateate(4), Paint()..color = Color(0xFFFF671F));
},
),
onChanged: (value) {
setState(() {
sliderValue = value;
});
},
onChangeStart: (value) {},
onChangeEnd: (value) {},
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: Text("step"),
),
Container(
constraints: BoxConstraints.expand(height: 44),
margin: EdgeInsets.symmetric(horizontal: 20),
child: BetterCupertinoSlider(
min: 0.0,
max: maxValue,
value: sliderValue,
configure: BetterCupertinoSliderConfigure(),
onChanged: (value) {
setState(() {
sliderValue = value;
});
},
onChangeStart: (value) {},
onChangeEnd: (value) {
setState(() {
sliderValue = value.round().toDouble();
});
},
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: Text("no thumb"),
),
Container(
constraints: BoxConstraints.expand(height: 44),
margin: EdgeInsets.symmetric(horizontal: 20),
child: BetterCupertinoSlider(
min: 0.0,
max: maxValue,
value: sliderValue,
configure: BetterCupertinoSliderConfigure(
thumbRadius: 2,
thumbPainter: (canvas, rect) {},
),
onChangeStart: (value) {},
onChangeEnd: (value) {
setState(() {
sliderValue = value.round().toDouble();
});
},
),
),
],
),
),
),
);
}
}
更多关于Flutter iOS风格滑块插件better_cupertino_slider的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
1 回复
更多关于Flutter iOS风格滑块插件better_cupertino_slider的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然，以下是如何在Flutter项目中使用better_cupertino_slider插件的示例代码。这个插件提供了iOS风格的滑块控件。
首先，确保你已经在pubspec.yaml文件中添加了better_cupertino_slider依赖项：
dependencies:
flutter:
sdk: flutter
better_cupertino_slider: ^x.y.z # 请替换为最新版本号
然后，运行flutter pub get来安装依赖项。
接下来，你可以在你的Flutter应用中使用这个滑块控件。以下是一个完整的示例代码：
import 'package:flutter/material.dart';
import 'package:better_cupertino_slider/better_cupertino_slider.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Better Cupertino Slider Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: SliderScreen(),
);
}
}
class SliderScreen extends StatefulWidget {
@override
_SliderScreenState createState() => _SliderScreenState();
}
class _SliderScreenState extends State<SliderScreen> {
double _value = 50.0;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Better Cupertino Slider Demo'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'Slider Value: $_value',
style: TextStyle(fontSize: 24),
),
SizedBox(height: 24),
BetterCupertinoSlider(
value: _value,
minValue: 0,
maxValue: 100,
divisions: 100,
onChanged: (double newValue) {
setState(() {
_value = newValue;
});
},
onDragStarted: () {
print('Drag started');
},
onDragEnded: (double value) {
print('Drag ended with value: $value');
},
),
],
),
),
);
}
}
代码解释
-
依赖项添加：
- 在
pubspec.yaml文件中添加better_cupertino_slider依赖项。
- 在
-
主应用结构：
MyApp是一个无状态小部件，它定义了应用的主题和主屏幕。SliderScreen是一个有状态小部件，它包含滑块和显示滑块值的文本。
-
滑块控件：
BetterCupertinoSlider是核心控件，它接受多个参数，如value（当前值）、minValue（最小值）、maxValue（最大值）、divisions（分段数量）等。onChanged回调用于更新滑块的值。onDragStarted和onDragEnded回调分别用于处理拖动开始和结束的事件。
-
界面布局：
- 使用
Column布局将文本和滑块垂直排列。 SizedBox用于在控件之间添加间距。
- 使用
运行应用
确保你已经连接了一个iOS模拟器或设备，然后运行flutter run命令来启动应用。你应该能够看到一个包含iOS风格滑块的界面，并且滑块的值会实时更新到文本中。
希望这个示例对你有帮助！如果有更多问题，请随时提问。
