一统天下 flutter - widget 架构类: BottomSheet - 底部弹出框
示例如下:
lib\widget\structure\scaffold_bottom_sheet.dart
/*
* BottomSheet - 底部弹出框
*
* showBottomSheet() - 可以理解为在当前页面弹出底部弹出框
* showModalBottomSheet() - 可以理解为新开页面弹出底部弹出框
*/
import 'package:flutter/material.dart';
import 'package:flutter_demo/helper.dart';
class ScaffoldBottomSheetDemo extends StatefulWidget {
const ScaffoldBottomSheetDemo({Key? key}) : super(key: key);
@override
_ScaffoldBottomSheetDemoState createState() => _ScaffoldBottomSheetDemoState();
}
class _ScaffoldBottomSheetDemoState extends State<ScaffoldBottomSheetDemo> {
/// 底部弹出框的内容
Widget _myWidget() {
return Container(
height: 400,
color: Colors.red,
alignment: Alignment.center,
child: TextButton(
child: const MyText("close"),
onPressed: () {
Navigator.of(context).pop();
},
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text("title"),),
backgroundColor: Colors.orange,
body: const Align(
alignment: Alignment.topCenter,
child: MyText('hello webabcd'),
),
floatingActionButton: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
/// 用于演示 showBottomSheet()
Builder(
builder: (BuildContext context) {
return FloatingActionButton(
child: const Text('1'),
onPressed: () {
/// 需要通过 Scaffold.of(context) 使用 showBottomSheet()
/// 这里要借助 Builder 否则 context 中没有 Scaffold
/// 点击返回按钮时，底部弹出框会自动隐藏
Scaffold.of(context).showBottomSheet(
(context) {
return _myWidget();
},
/// 底部弹出框是否支持下滑隐藏
enableDrag: true,
);
},
);
},
),
/// 用于演示 showModalBottomSheet()
FloatingActionButton(
child: const Text('2'),
onPressed: () {
/// 可以直接使用 showModalBottomSheet()
/// 点击返回按钮时，底部弹出框会自动隐藏
showModalBottomSheet(
context: context,
builder: (context){
return _myWidget();
},
/// 底部弹出框是否支持下滑隐藏
enableDrag: true,
/// 点击非底部弹出框的区域时，是否需要自动隐藏底部弹出框
isDismissible: false,
/// 遮罩层的颜色
barrierColor: Colors.green.withAlpha(0x66),
);
},
)
],
),
);
}
}