不使用iOS独立模式的角度服务工作人员

Question

我正在与离子v4和角PWA服务工作人员的PWA工作。在app.component.ts上有一个注入服务来检查PWA上是否有更新，然后下载和重新加载。

当我用浏览器打开PWA时，服务可以正常工作，如果我部署了更新，服务工作人员将更新缓存的PWA和“自动重新加载”页面。

问题出现在PWA /独立模式上，在iOS上，当PWA被添加到主屏幕时，它就不会再刷新了，甚至会用任务应用程序列表杀死它。只有当我关闭设备，并再次刷新应用程序的状态。在Android设备上，PWA模式下所有设备都能正常工作。

--这是我的版本检查器服务，用角服务工作器实现：

import {Injectable} from '@angular/core';
import {SwUpdate} from '@angular/service-worker';

@Injectable()
export class LogUpdateService {

    constructor(updates: SwUpdate) {
        console.warn('check')
        updates.available.subscribe(event => {
            console.log('current version is', event.current);
            console.log('available version is', event.available);
            updates.activateUpdate().then(() => {
                console.warn('downloaded')
                document.location.reload();
            });
        });
        updates.activated.subscribe(event => {
            console.log('old version was', event.previous);
            console.log('new version is', event.current);
        });
    }
}

这是我的package.json:

"dependencies": {
    "@angular/common": "^7.2.9",
    "@angular/core": "^7.2.9",
    "@angular/forms": "^7.2.9",
    "@angular/http": "^7.2.9",
    "@angular/platform-browser": "^7.2.9",
    "@angular/platform-browser-dynamic": "^7.2.9",
    "@angular/pwa": "0.13.8",
    "@angular/router": "^7.2.9",
    "@angular/service-worker": "7.2.12",
    "@ionic-native/core": "^5.2.0",
    "@ionic-native/network": "^5.2.0",
    "@ionic-native/splash-screen": "^5.2.0",
    "@ionic-native/status-bar": "^5.2.0",
    "@ionic/angular": "4.2.0",
    "@ionic/storage": "^2.2.0",
    "@ngx-translate/core": "^11.0.1",
    "@ngx-translate/http-loader": "^4.0.0",
    "cordova-plugin-network-information": "2.0.1",
    "cordova-sqlite-storage": "3.2.0",
    "core-js": "^2.6.5",
    "ionic2-calendar": "^0.5.2",
    "moment": "^2.24.0",
    "rxjs": "~6.4.0",
    "serve": "^10.1.2",
    "zone.js": "~0.8.29"
  },
  "devDependencies": {
    "@angular-devkit/architect": "0.13.8",
    "@angular-devkit/build-angular": "0.13.8",
    "@angular-devkit/core": "7.3.8",
    "@angular-devkit/schematics": "7.3.8",
    "@angular/cli": "7.3.8",
    "@angular/compiler": "~7.2.9",
    "@angular/compiler-cli": "~7.2.9",
    "@angular/language-service": "~7.2.9",
    "@ionic/angular-toolkit": "1.5.0",
    "@types/jasmine": "~3.3.9",
    "@types/jasminewd2": "~2.0.6",
    "@types/node": "~11.11.3",
    "@ionic/lab": "1.0.24",
    "codelyzer": "~4.5.0",
    "jasmine-core": "~3.3.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.0.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.5",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "protractor": "~5.4.2",
    "ts-node": "~8.0.3",
    "tslint": "~5.14.0",
    "typescript": "^3.1.6"
  },
  "description": "An Ionic project",
  "cordova": {
    "plugins": {
      "cordova-sqlite-storage": {},
      "cordova-plugin-network-information": {}
    }
  }

对这个问题有什么想法吗？

Answer 1

请参阅：iOS 12.2测试版上的PWAs :好的、坏的，以及“尚不确定是否好”

Answer 2

我找到的唯一解决方案是编写一个javascript函数(例如，updateiOS())，它将执行以下操作

1-验证我们是否在iOS独立模式下运行(如果没有，就不要继续)

2-在服务器上检查一个新版本，如果我们找到了一个新版本，就重新加载页面(确保这个https请求没有缓存！)

3-将最后一次检查时间保存在变量中(例如var lastCheckTime)

在我的主要javascript函数中，我将为"focus“事件创建一个监听器，它将检查now和lastCheckTime之间的差异，如果它超过1天，那么调用updateiOS()

到目前为止，焦点活动与我合作得很好。