Service to focus all Loadings of your application

loading-service.ts

import { Injectable } from '@angular/core';
import { LoadingController, Loading, AlertController } from 'ionic-angular';

// Declare LoadingService as a provider in app.module.ts
// Inject LoadingService in your class: constructor(public Loading: LoadingService){}
// Use the this.Loading.showLoading(), this.Loading.loadingDismiss() or this.Loading.showError() methods wherever you want
@Injectable()
export class LoadingService {
  loading: Loading;

  constructor(private loadingCrtl: LoadingController, private alertCtrl: AlertController) {}

  showLoading() {
    this.loading = this.loadingCrtl.create({
      content: 'Carregando...'
    });

    this.loading.present();
  }

  loadingDismiss() {
    this.loading.dismiss();
  }

  showError(text){
    setTimeout(() => {
      this.loading.dismiss();
    });

    let alert = this.alertCtrl.create({
      title: 'Falha',
      subTitle: text,
      buttons: ['OK']
    });

    alert.present(prompt);
  }

}