home.ts

import { Component } from '@angular/core';
import { NavController, AlertController } from 'ionic-angular';
import { AutenticacaoServiceProvider } from '../../providers/autenticacao-service/autenticacao-service';

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

  constructor(
    public navCtrl: NavController,
    public authService: AutenticacaoServiceProvider,
     public alertCtrl: AlertController) {
      // TODO:
  }

  loginUser() {
    this.authService.login();
  }

  logoutUser() {
    this.authService.logout();
  }

  nextPage() {
    this.navCtrl.push('Pagina2Page').catch(err => {
      let alert = this.alertCtrl.create({
        title: 'Entrada proibida!',
        subTitle: 'Você não passará',
        buttons: ['Entendi']
      });
      alert.present();
    });
  }

  isAuthenticated() {
    return this.authService.authenticated();
  }
}