1 AlertDialog
1.1 说明
最简单的方案是利用AlertDialog组件构建一个弹框
1.2 示例
void alertDialog(BuildContext context) async {
var result = await showDialog(
barrierDismissible: false, //表示点击灰色背景的时候是否消失弹出框
context: context,
builder: (context) {
return AlertDialog(
title: const Text("提示信息!"),
content: const Text("您确定要删除吗"),
actions: [
TextButton(
onPressed: () {
print("ok");
Navigator.of(context).pop("ok"); //点击按钮让AlertDialog消失
},
child: const Text("确定")),
TextButton(
onPressed: () {
print("cancel");
Navigator.of(context).pop("取消");
},
child: const Text("取消"))
],
);
});
print("-----------");
print(result);
}2 SimpleDialog
2.1 说明
通过SimpleDialog构建一个选择框
2.2 示例
void simpleDialog(BuildContext context) async {
var result = await showDialog(
barrierDismissible: false, //表示点击灰色背景的时候是否消失弹出框
context: context,
builder: (context) {
return SimpleDialog(
title: const Text("请选择语言"),
children: [
SimpleDialogOption(
onPressed: () {
print("汉语");
Navigator.pop(context, "汉语");
},
child: const Text("汉语"),
),
const Divider(),
SimpleDialogOption(
onPressed: () {
print("英语");
Navigator.pop(context, "英语");
},
child: const Text("英语"),
),
const Divider(),
SimpleDialogOption(
onPressed: () {
print("日语");
Navigator.pop(context, "日语");
},
child: const Text("日语"),
),
const Divider(),
],
);
});
print("-----------");
print(result);
}
3 自定义Flutter Dialog
3.1 说明
通过继承Dialog实现自定义的弹窗
3.2 示例
// 自定义dialog
class MyDialog extends Dialog {
String title;
String content;
Function()? onClosed;
MyDialog({Key? key, required this.title,required
this.onClosed,this.content=""}) : super(key: key);
@override
Widget build(BuildContext context) {
return Material(
type: MaterialType.transparency,
child: Center(
child: Container(
height: 300,
width: 300,
color: Colors.white,
child: Column(
children: <Widget>[
Padding(
padding: const EdgeInsets.all(10),
child: Stack(
children: <Widget>[
Align(
alignment: Alignment.center,
child: Text(title),
),
Align(
alignment: Alignment.centerRight,
child: InkWell(
onTap: onClosed,
child: const Icon(Icons.close),
),
)
],
),
),
const Divider(),
Container(
padding: const EdgeInsets.all(10),
width: double.infinity,
child: Text(content,textAlign: TextAlign.left),
)
],
),
)),
);
}
}4 Flutter Toast
4.1 第三方框架
4.1.1 说明
https://pub.dev/packages/fluttertoast
4.1.2 示例
Fluttertoast.showToast(
msg: "提示信息",
toastLength: Toast.LENGTH_LONG, //值针对 android 平台
timeInSecForIosWeb: 1, //提示时间 针对ios 和 web
backgroundColor: Colors.black26, //背景颜色
textColor: Colors.white, //文本颜色
fontSize: 16.0 //文本字体大小
);4.2 自定义
4.2.1 说明
所谓toast框其实就是在图层的最上面一层插入一个显示图层，在Flutter中利用OverLayEntry构建图层，然后通过Overlay进行插入
4.2.2 示例
import 'package:flutter/material.dart';
class Toast {
static var _lastMsg;
static int _lastShowms = 0;
static get flag => true;
static OverlayEntry? entry;
static Future _show(BuildContext context, String msg, int duration) {
entry = OverlayEntry(
builder: (BuildContext context) => Positioned(
//top值，可以改变这个值来改变toast在屏幕中的位置
top: MediaQuery.of(context).size.height.toDouble() * 0.5,
child: Container(
alignment: Alignment.center,
width: MediaQuery.of(context).size.width,
child: Padding(
padding: const EdgeInsets.symmetric(horizontal: 10.0),
child: ToastWidget(msg: "test",duration: duration,),
// child: _buildToastWidget(context,msg),
)
),
),
);
///往Overlay中插入插入OverlayEntry
Overlay.of(context)?.insert(entry!);
///两秒后，移除Toast
// Future result = Future.delayed(Duration(milliseconds: duration)).then((value) {
// print("移除....");
// entry!.remove();
// });
// return result;
return Future(() => 0);
}
//toast UI绘制
static _buildToastWidget(context, String msg) {
return Row(
mainAxisSize: MainAxisSize.min,
children: [
Container(
alignment: Alignment.center,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(12.0),
shape: BoxShape.rectangle,
color: Colors.black45,
),
child: Padding(
padding: const EdgeInsets.all(10),
child: Text(
msg,
style: const TextStyle(
color: Colors.white,
decoration: TextDecoration.none,
fontSize: 14)
),
)
)
],
);
}
//处理重复多次点击
static void _handleDuplicateAndShow(
String message, BuildContext context, int duration) {
if (_lastMsg == message) {
//相同信息内容
int currentms = DateTime.now().millisecondsSinceEpoch;
int interval = currentms - _lastShowms;
if (interval > duration) {
//大于时间间隔 可以显示
_show(context, message, duration);
_lastShowms = currentms;
}
} else {
_show(context, message, duration);
_lastMsg = message;
}
}
/// 提示
static void showInfo(String message, {required BuildContext context, int duration = 2000}) {
_handleDuplicateAndShow(message, context, duration);
}
}
class ToastWidget extends StatefulWidget {
String msg;
int duration;
ToastWidget({super.key,required this.msg,required this.duration});
@override
State<ToastWidget> createState() => _ToastState();
}
class _ToastState extends State<ToastWidget> with SingleTickerProviderStateMixin {
late AnimationController _controller;
@override
void initState() {
_controller = AnimationController(
vsync: this,
duration: const Duration(seconds: 1),
);
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
//启动正序一次
Future((){
print("启动动画...");
_controller.forward();
}).then((value) {
//结束倒叙一次
Future.delayed(Duration(milliseconds: widget.duration-2)).then((value) async{
print("启动结束动画...");
await _controller.reverse();
//移除图层
Toast.entry!.remove();
print("移除图层...");
});
});
print("构建组件");
return Center(
child: FadeTransition(
opacity: _controller,
child:Row(
mainAxisSize: MainAxisSize.min,
children: [
Container(
alignment: Alignment.center,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(12.0),
shape: BoxShape.rectangle,
color: Colors.black45,
),
child: Padding(
padding: const EdgeInsets.all(10),
child: Text(
widget.msg,
style: const TextStyle(
color: Colors.white,
decoration: TextDecoration.none,
fontSize: 14)
),
)
)
],
),
),
);
}
}