login() {
  this.Loading("","send");
  this.http.postData(this.userData, "post/login").subscribe( result => {
   this.responseData = result;
   if (this.responseData.success) {
    localStorage.setItem('userSesion', JSON.stringify(this.responseData.dataUser));
    if (this.responseData.dataUser.tipo === '1') {
      this.navCtrl.setRoot(InicioPage);
    } else if (this.responseData.dataUser.tipo === '2') {
      this.navCtrl.setRoot(IniciodocentePage);
    }
   } else {
     this.Loading(this.responseData.dataUser,"error");
   }
  }, (err) => {
    console.log(err);
  });
}

export class MyApp {
 @ViewChild(Nav) nav: Nav;

 rootPage: any = HomePage;

 pages: Array<{title: string, component: any}>;
 public sesion:boolean;
 public opt:boolean;
 userDetails:any = {};

 constructor(public platform: Platform, public statusBar: StatusBar, public splashScreen: SplashScreen) {
  this.initializeApp();

  if (localStorage.getItem('userSesion')) {
   const data = JSON.parse(localStorage.getItem('userSesion'));
   this.userDetails = data;
   this.sesion = true;
   if (this.userDetails.tipo == '1') {
    this.pages = [
      { title: 'Inicio', component: InicioPage },
      { title: 'Registro de Inscripción', component: CarrerasestudiantePage },
      { title: 'Historial Academico', component: HistoricoPage },
      { title: 'Procesar Inscripción', component: ProcesarinscripcionPage }
    ];
   } else if (this.userDetails.tipo == '2') {
    this.pages = [
      { title: 'Inicio', component: IniciodocentePage },
      { title: 'Mi Carga Académica', component: CargaacademicaprofesorPage }
    ];
   }
 } else {
   this.pages = [
     { title: 'Entrar', component: HomePage },
     { title: 'Olvide mi clave', component: AboutPage },
     { title: 'Consultar Estatus', component: ContactPage }
   ];
   this.sesion = false;
 }
}

initializeApp() {
  this.platform.ready().then(() => {
    this.statusBar.styleDefault();
    this.splashScreen.hide();
  });
}

 openPage(page) {
  this.nav.setRoot(page.component);
 }
}

export class User {
    username: string;
    email: string;
    password: string;
    tokens: Array<Token> = [];

    constructor(username, password, email = '') {
        this.username = username;
        this.email = email;
        this.password = password;
    }
}

//user.service.ts

import { BehaviorSubject, Observable } from 'rxjs';
export class UserService {

    user: User;
    private userSubject = new BehaviorSubject(this.user);

    // Lo demas componentes se ponen a la esucha de cambio
    // a través de esté método
    getUserObservable(): Observable<User> {
        return this.userSubject.asObservable();
    }

  // Este método se usa para enviar los cambios a todos los componentes a la escucha
  private setUser(user: User) {
      this.user = user;
      // Refrescar user en los observables
      this.userSubject.next(this.user);
   }
}

import {UserService} from 'user.service'

export class Menu {

    user: User;

    constructor(userService:UserService){
        // REGISTRASE AL OBSERVABLE DE UserService
        // para estar a la escucha de cambios de user
        this.userService.getUserObservable().subscribe(
        (data) => {
           this.user = data;
        }, (error) => {
            console.log(error);
        });
    }
}