Flutter——AlertDialog组件、SimpleDialog组件、showModalBottomSheet组件（弹窗组件）

• AlertDialog组件

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    title: "DialogWidget",
    home: MyApp(),
  ));
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {

  _alertDialog() 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: Text("提示信息"),
            content: Text("您确定要删除吗?"),
            actions: <Widget>[
              FlatButton(
                child: Text("取消"),
                onPressed: () {
                  print("取消");
                  Navigator.of(context).pop("Cancel");
                },
              ),
              FlatButton(
                child: Text("确定"),
                onPressed: () {
                  print("确定");
                  Navigator.of(context).pop("Ok");
                },
              )
            ],
          );
        }
    );
    print(result);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: RaisedButton(
          child: Text("AlertDialog"),
          onPressed: _alertDialog,
        ),
      )
    );
  }
}

• SimpleDialog组件

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    title: "DialogWidget",
    home: MyApp(),
  ));
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {

  _simpleDialog() async{
    var result = await showDialog(
        barrierDismissible: true,  // 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: Text("选择内容"),
            children: <Widget>[
              SimpleDialogOption(
                child: Text("Option A"),
                onPressed: () {
                  print("Option A");
                  Navigator.pop(context,"A");
                },
              ),
              Divider(),
              SimpleDialogOption(
                child: Text("Option B"),
                onPressed: () {
                  print("Option B");
                  Navigator.pop(context,"B");
                },
              ),
              Divider(),
              SimpleDialogOption(
                child: Text("Option C"),
                onPressed: () {
                  print("Option C");
                  Navigator.pop(context,"C");
                },
              )
            ],
          );
        }
    );
    print(result);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: RaisedButton(
          child: Text("SimpleDialog"),
          onPressed: _simpleDialog,
        ),
      )
    );
  }
}

• showModalBottomSheet组件

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    title: "DialogWidget",
    home: MyApp(),
  ));
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {

  _modelBottomSheet() async{
    var result = await showModalBottomSheet(
        context: context,
        builder: (context) {
          return Container(
            height: 220.0,
            child: Column(
              children: <Widget>[
                ListTile(
                  title: Text("分享 A"),
                  onTap: () {
                    Navigator.pop(context,"分享 A");
                  },
                ),
                Divider(),
                ListTile(
                  title: Text("分享 B"),
                  onTap: () {
                    Navigator.pop(context,"分享 B");
                  },
                ),
                Divider(),
                ListTile(
                  title: Text("分享 C"),
                  onTap: () {
                    Navigator.pop(context,"分享 C");
                  },
                )
              ],
            ),
          );
        }
    );
    print(result);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: RaisedButton(
          child: Text("showModalBottomSheet"),
          onPressed: _modelBottomSheet,
        ),
      )
    );
  }
}