功能点：

1.更新弹窗UI

2.强更与非强更且别控制

3.屏蔽物理返回键（因为强更的时候点击返回键，弹窗会消失）

4.点击弹窗外透明区域时，弹窗不消失

先看下效果图：

Dialog实现代码：

import 'package:flutter/material.dart';import 'package:xiaopijiang/utils/assets_util.dart';import 'package:xiaopijiang/utils/toast_util.dart';///created by WGH///on 2020/7/23///description:版本更新提示弹窗class UpdateDialog extends Dialog { final String upDateContent; final bool isForce; UpdateDialog({this.upDateContent, this.isForce}); @override Widget build(BuildContext context) { return Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Container( width: 319, height: 370, child: Stack( children: <Widget>[ Image.asset( AssetsUtil.getImagePath( imageName: 'bg_update', suffix: 'png'), fit: BoxFit.cover, ), Container( width: double.infinity, child: Column( mainAxisAlignment: MainAxisAlignment.spaceBetween, children: <Widget>[ Container( margin: EdgeInsets.only(top: 110), child: Text('发现新版本', style: TextStyle( fontSize: 20, color: Colors.white, decoration: TextDecoration.none)), ), Text(upDateContent, style: TextStyle( fontSize: 16, color: Colors.black54, decoration: TextDecoration.none)), Container( width: 250, height: 42, margin: EdgeInsets.only(bottom: 15), child: RaisedButton( color: Colors.red, shape: StadiumBorder(), child: Text( '立即更新', style: TextStyle(fontSize: 20, color: Colors.white), ), onPressed: () { ToastUtil.showTips('下载apk'); }), ) ], ), ), ], ), ), GestureDetector( onTap: () { Navigator.pop(context); }, child: Offstage( offstage: isForce, child: Container( margin: EdgeInsets.only(top: 30), child: Image.asset( AssetsUtil.getImagePath( imageName: 'ic_update_close', suffix: 'png'), width: 35, height: 35, )), ), ) ], ), ); } static showUpdateDialog( BuildContext context, String mUpdateContent, bool mIsForce) { return showDialog( barrierDismissible: false, context: context, builder: (BuildContext context) { return WillPopScope( child: UpdateDialog( upDateContent: mUpdateContent, isForce: mIsForce),onWillPop: _onWillPop); }); } static Future<bool> _onWillPop() async{ return false; }}

调用Dialog：

_checkUpdate() async{ int serviceVersionCode = 101; PackageInfo packageInfo = await PackageInfo.fromPlatform(); //获取当前的版本号 int currentVersionCode = int.parse(packageInfo.version.replaceAll('.', '')); //如果获取服务器的版本号比当前应用程序的版本号还高，那么提示升级 if (serviceVersionCode > currentVersionCode) { if(Platform.isAndroid){ //Android平台在应用内进行更新 //弹出"版本更新"的对话框 UpdateDialog.showUpdateDialog(context, '1.修复已知bug\n2.优化用户体验', false); }else if(Platform.isIOS){ //iOS平台跳转道AppStore进行更新 } } }

重点说明：

屏蔽物理返回键（因为强更的时候点击返回键，弹窗会消失）

barrierDismissible: false,

4.点击弹窗外透明区域时，弹窗不消失

return WillPopScope( child: UpdateDialog( upDateContent: mUpdateContent, isForce: mIsForce), onWillPop: _onWillPop); static Future<bool> _onWillPop() async { return false; }

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