Flutter之自定义Dialog实现版本更新弹窗功能的实现

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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