This small tutorial explains how to pre-render or pre-populate the data in the form in ionic 2. Mostly we do this while editing form.
I am using typscript and Ionic 2 framework. I am considering you already having project setup.

Cordova CLI: 6.4.0
Ionic Framework Version: 2.0.0-rc.0
Ionic CLI Version: 2.1.7
Ionic App Lib Version: 2.1.4
Ionic App Scripts Version: 0.0.30
OS: Linux 3.13
Node Version: v6.6.0

Lets say, you want to create the contact form with name and contact number fields.

contact/
contact.html
contact.ts
contact.scss

Your HTML file should be something like this.

    <form #contactsForm="ngForm" novalidate autocomplete="false">
      <ion-item>
      	<ion-label stacked>Contact Name</ion-label>
        <ion-input [(ngModel)]="contact.name" name="contact_name" type="text"  #name="ngModel" spellcheck="false" autocapitalize="off" required>
        </ion-input>
      </ion-item>

      <p [hidden]="name.valid || submitted == false" color="danger" padding-left>
        Contact name can't be empty!
      </p>


      <ion-item>
      	<ion-label stacked>Contact Number </ion-label>
        <ion-input [(ngModel)]="contact.mobile" name="contact_mobile" type="text"  #mobile="ngModel" spellcheck="false" autocapitalize="off" required> 
        </ion-input>
        <ion-icon name="contact" (click)="pickContact()" icon-right item-right></ion-icon>

      </ion-item>      

      <p [hidden]="mobile.valid || submitted == false" color="danger" padding-left>
        Contact number can't be empty!
      </p>

      <ion-row responsive-sm>
        <ion-col>
          <button ion-button (click)="onSave(contactsForm)" type="submit" color="secondary" block>Save Contact</button>
        </ion-col>
      </ion-row>      

    </form>

Typescript file (contact.ts)

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';

import { UserData } from '../../providers/user-data';

@Component({
  selector: 'page-contact',
  templateUrl: 'contact.html'
})
export class ContactPage {

	submitted = false;
	contact: {
		name?: string,
		mobile?:string,
		id?:string,
    message?:string
	} = {name:'',mobile:'',id:''};


  constructor(
  	public navCtrl: NavController,
  	public userData: UserData
  	) {

  	
  }

  ionViewDidLoad() {

        this.userData.contact().then((contact) => { 

            this.contact = JSON.parse(contact);  // this will bind the data to the view

        });    
    
  }

Provider file user-data.ts

import { Injectable } from '@angular/core';
import { Storage } from '@ionic/storage';



@Injectable()
export class UserData {
  

  constructor(
      public storage: Storage,
      ) {}


  setContact(contact) {
    this.storage.set('contact', JSON.stringify(contact));
  }

  getContact() {
    return this.storage.get('contact').then((value) => {
      return value;
    });
  }

}

Hope this helps someone