import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams } from 'ionic-angular';
//Fomulario
import { FormBuilder, FormGroup, Validators } from '@angular/forms';

@IonicPage()
@Component({
  selector: 'page-login',
  templateUrl: 'login.html',
})
export class LoginPage {

  //Datos en crudo
  myForm: FormGroup;
  constructor(public navCtrl: NavController,
    public navParams: NavParams,
    public formBuilder: FormBuilder) {
    this.myForm = this.formBuilder.group({
      user: ['', [Validators.required]],
      password: ['', [Validators.required]],
    });
  }

  saveData() {
    this.navCtrl.push('TabsPage');
    // alert(JSON.stringify(this.myForm.value));
  }

}

ERROR Error: Uncaught (in promise): Error: StaticInjectorError(AppModule)[Tab -> Tabs]:
  StaticInjectorError(Platform: core)[Tab -> Tabs]:
    NullInjectorError: No provider for Tabs!

import { NgModule } from '@angular/core';
import { IonicPageModule } from 'ionic-angular';
import { TabsPage } from './tabs';

@NgModule({
  declarations: [
    TabsPage,
  ],
  imports: [
    IonicPageModule.forChild(TabsPage),
  ],
})
export class TabsPageModule {}

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

@IonicPage()

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

  tab1Root = 'HomePage';
  tab2Root = 'SalePage';
  tab3Root = 'ProducrPage';
  tab4Root = 'ProfilePage';

  constructor() {

  }

}