http://stackoverflow.com/questions/41724244/ngfor-with-two-way-binding-in-ionic-2/41726406

example.ts

import {Component, OnInit} from '@angular/core';
import { NavController } from 'ionic-angular';
import {BehaviorSubject, Observable} from "rxjs";

@Component({
  selector: 'page-home',
  template: `
    <ion-header>
      <ion-navbar>
        <ion-title>Home</ion-title>
      </ion-navbar>
    </ion-header>
  
    <ion-content padding>
      <ion-badge *ngFor="let tag of tags | async">{{tag.name}}</ion-badge>
     </ion-content>
 `
})
export class HomePage implements OnInit{

  tags : BehaviorSubject<any> = new BehaviorSubject([]);

  constructor(public navCtrl: NavController) {

  }

  ngOnInit(){
    Observable.interval(2000)
      .map(id => {
        return { id: id, name: 'tag ' + id
        };
      })
      .bufferWhen(() => Observable.interval(5000))
      .subscribe(tags => this.tags.next(tags));


  }

}