async clickMe() {
   const loading = await this.loadingController.create({
     duration: 1000,
     content: 'Ahem. Please wait.'
   });
   return loading.present();
 }

 async presentLoading( message:string) {
   this.loading = await this.loadingCtrl.create({
     message,
     //duration: 2000
   })
   console.log('inicia loading');
   return await this.loading.present();
 }

 async mostrar_cargando() {
   const cargando = await this.loaCtrl.create({
     spinner: null,
     duration: 1000,
     message: 'Cargando...',
     translucent: true,
     cssClass: 'custom-class custom-loading'
   });
   cargando.present();
 }

      .then( async confirmationResult => {
        this.loadingCtrl.dismiss();
        console.log('confirmationResult: '+phoneNumberString);
        // SMS sent. Prompt user to type the code from the message, then sign the
        // user in with confirmationResult.confirm(code).

        
      
        let prompt = await this.alertCtrl.create({
        backdropDismiss: false,
        header: 'Código de confirmação',
        message: 'Verifique seu SMS',
        inputs: [{ name: 'confirmationCode', placeholder: 'Código de confirmação' }],
        buttons: [
          { text: 'Cancelar',
            handler: (result) => { 
              //console.log('Cancel clicked'); 
              //this.router.navigate(['/splash']);
              window.location.reload();
            }
          },
          { text: 'Confirmar',
            handler: data => {
              confirmationResult.confirm(data.confirmationCode)
              .then(function (result) {
                // User signed in successfully.                
                
                this.router.navigate(['/home']);
                this.salvaLog('auth',result);
                // ...
              }).catch(function (result) {
                // User couldn't sign in (bad verification code?)
                this.salvaLog('auth',result,true);
                console.log('Ocorreu um erro!'+result);
              });
            }
          }
        ]
      });

      await prompt.present();
      
    })