角离子2页变化事件

每次页面改变时,我都要执行一些代码.

我可以添加一个ngOnDestroy方法到每个页面.看来我可以使用Ionic 2第lifecycle hooks页(例如ionViewDidUnload)获得完全相同的效果,但是我没有打扰测试,我宁愿在主应用程序类中添加一个方法.

我看到你可以订阅Angular 2 Router events.如何翻译用于Ionic 2？我从“@ angular / router”导入{Router}时遇到错误首先：

TypeScript error: <path>/node_modules/@angular/router/src/common_router_providers.d.ts(9,55): Error TS2305: Module '"<path>/node_modules/@angular/core/index"' has no exported member 'NgModuleFactoryLoader'.
TypeScript error: <path>/node_modules/@angular/router/src/router.d.ts(14,39): Error TS2305: Module '"<path>/node_modules/@angular/core/index"' has no exported member 'NgModuleFactoryLoader'.
TypeScript error: <path>/node_modules/@angular/router/src/router_module.d.ts(9,10): Error TS2305: Module '"<path>/node_modules/@angular/core/index"' has no exported member 'ModuleWithProviders'.

webpack配置

var path = require('path');
 
 
module.exports = {
  entry: [
    path.normalize('es6-shim/es6-shim.min'),'reflect-Metadata',path.normalize('zone.js/dist/zone'),path.resolve('app/app.ts')
  ],output: {
    path: path.resolve('www/build/js'),filename: 'app.bundle.js',pathinfo: false // show module paths in the bundle,handy for debugging
  },module: {
    loaders: [
      {
        test: /\.ts$/,loader: 'awesome-typescript',query: {
          doTypeCheck: true,resolveGlobs: false,externals: ['typings/browser.d.ts']
        },include: path.resolve('app'),exclude: /node_modules/
      }
    ],noParse: [
      /es6-shim/,/reflect-Metadata/,/zone\.js(\/|\\)dist(\/|\\)zone/
    ]
  },resolve: {
    alias: {
      'angular2': path.resolve('node_modules/angular2')
    },extensions: ["",".js",".ts"]
  }
};

如果有一种方法可以使用离子角度的Nav或NavController服务,这将更有意义.有办法吗？

另一个选择是创建一个超类,你可以使用这样的ionViewDidUnload方法(或任何其他生命周期钩子)：

import { Events } from 'ionic-angular';
 
export class BasePage {
 
  constructor(public eventsCtrl: Events) { }
 
  ionViewDidEnter() {
    this.eventsCtrl.publish('page:load');   
  }
 
  ionViewDidUnload() {
    this.eventsCtrl.publish('page:unload');   
  }
}

然后在每一页你只需要扩展该BasePage

@Component({
  templateUrl: 'build/pages/my-page/my-page.html',})
export class MyPage extends BasePage {
 
constructor(private platform: Platform,private nav: NavController,private menuCtrl: MenuController,...,eventsCtrl: Events) //notice that this one does not have the private/public keyword 
  {    
 
    // Due to an issue in angular,by now you must send the dependency to the super class
    // https://github.com/angular/angular/issues/5155
    super(eventsCtrl);
 
    //...
}

然后,您可以在主应用程序文件中添加像这样的方法来响应这些事件：

private initializeEventHandlers() {
 
    this.events.subscribe('page:load',() => {
      // your code...
    });
 
    this.events.subscribe('page:unload',() => {
      // your code...
    });
 
  }

角离子2页变化事件

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