file-transfer incidence in IOS IONIC 3 - ionic-framework

Question

I commented that I am developing an application in IONIC 3 and I am working with the native file transfer library.
At the moment of wanting to download a file in IOS it does not execute it, not so when it is installed or debugged in android.
According to the ionic documentation I am implementing it correctly and I do not understand why or what is missing so that IOS can execute the transfer.download which is the instruction that is not executed
and I get the following error in the console:
console.warn: 'Native: tried accessing the FileTransfer plugin but it's not installed.
Below I leave my code:
import { FileTransfer, FileTransferObject } from '#ionic-native/file-transfer';
import { File } from '#ionic-native/file';
import { LoadingController } from 'ionic-angular';
declare var cordova: any;
#IonicPage()
#Component({
selector: 'page-liquidaciones',
templateUrl: 'liquidaciones.html',
})
export class LiquidacionesPage {
formLiquidaciones: FormGroup;
public txtCorreoLiquidacion;
rutUsuario: any;
resultado: any;
liquidaciones: any;
liquidacionesSeleccionadas:any={};
loading: any;
storageDirectory: string = '';
//private fileTransfer: FileTransferObject;
//private localPath = '';
constructor(public navCtrl: NavController,
public navParams: NavParams,
private alertCtrl: AlertController,
public formBuilder: FormBuilder,
public kiberKiberpro: KibernumKiberproProvider,
public databaseService: DatabaseServiceProvider,
private transfer: FileTransfer,
private file: File,
private androidPermissions: AndroidPermissions,
public loadingController: LoadingController,
public platform: Platform
){
this.formLiquidaciones = this.formBuilder.group({
txtCorreoLiquidacion: ['', Validators.required]
});
this.platform.ready().then(() => {
if(!this.platform.is('cordova')) {
return false;
}
if (this.platform.is('ios')) {
//this.storageDirectory = this.file.dataDirectory;
this.storageDirectory = cordova.file.dataDirectory;
}
else if(this.platform.is('android')) {
this.storageDirectory = cordova.file.externalRootDirectory + '/Download/';
this.androidPermissions.checkPermission(this.androidPermissions.PERMISSION.READ_EXTERNAL_STORAGE).then(
result => {
if (result.hasPermission) {
// code
} else {
this.androidPermissions.requestPermission(this.androidPermissions.PERMISSION.READ_EXTERNAL_STORAGE).then(result => {
if (result.hasPermission) {
// code
}
});
}
},
err => this.androidPermissions.requestPermission(this.androidPermissions.PERMISSION.READ_EXTERNAL_STORAGE)
);
}
else {
return false;
}
});
this.databaseService.getSesion(2).then(result => {
this.rutUsuario = result.valor;
})
.catch( error => {
});
}
DescargarLiquidaciones(){
this.loading = this.loadingController.create({ content: "Descargando Liquidacion(es)..." });
const fileTransfer: FileTransferObject = this.transfer.create();
var enviarLiquidaciones = [];
for(var i in this.liquidacionesSeleccionadas) {
if(this.liquidacionesSeleccionadas[i]) {
enviarLiquidaciones.push(i);
}
}
if(enviarLiquidaciones.length == 0)
{
this.alerta("Debe seleccionar por lo menos una liquidación para que sea descargada.");
}
else
{
this.loading.present();
this.txtCorreoLiquidacion = '';
this.kiberKiberpro.DescargarEnviarLiquidaciones(this.rutUsuario,enviarLiquidaciones, this.txtCorreoLiquidacion).then((res) => {
this.resultado = res;
var respuesta = JSON.parse(this.resultado.data);
let datos: string = JWT(this.resultado.data);
if(respuesta.status == "200") {
let autorizacion = this.resultado.headers;
let nombreArchivo = datos.split("tmp/");
let urlFinal = datos;
fileTransfer.download(urlFinal , this.storageDirectory + nombreArchivo[1]).then((entry) => {
console.log("LLEGA ACA");
this.alerta("Se ha descargado el archivo de manera satisfactoria.");
console.log("LLEGA ACA 2");
this.loading.dismissAll();
console.log("LLEGA ACA 3");
this.databaseService.GuardaSQLlite(1, autorizacion.authorization);
this.navCtrl.setRoot(HomePage);
}, (error) => {
this.alerta("Hubo un error al momento de descargar el archivo. Si el problema persiste favor contactarse al 816 35 12 o 816 35 09.");
this.loading.dismissAll();
});
}
else if (respuesta.status == "201"){
this.alerta("Hubo un problema con el envío de la(s) liquidacion(es) al correo ingresado. Si el problema persiste favor contactarse al 816 35 12 o 816 35 09");
this.loading.dismissAll();
let autorizacion = this.resultado.headers;
this.databaseService.GuardaSQLlite(1, autorizacion.authorization);
}
else if (respuesta.status == "401"){
this.alerta("Token no válido.");
this.loading.dismissAll();
}
else{
this.alerta("Hubo un problema inesperado, Favor intente nuevamente. Si el problema persiste favor contactarse al 816 35 12 o 816 35 09");
this.loading.dismissAll();
}
}, (err) => {
this.alerta("Ha ocurrido un problema, intente nuevamente por favor. Si el error persiste pongase en contacto con el area de soporte.");
this.loading.dismissAll();
});
}
}
I remain attentive to your answers and I thank you in advance for your help and opinions

Answer 1

I forgot to put the information of my ionic which is the following:
Ionic:
ionic (Ionic CLI) : 4.1.2 (/usr/local/lib/node_modules/ionic)
Ionic Framework : ionic-angular 3.9.2
#ionic/app-scripts : 3.1.10
Cordova:
cordova (Cordova CLI) : 8.1.1 (cordova-lib#8.1.0)
Cordova Platforms : ios 4.5.4
Cordova Plugins : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 1.2.1, (and 6 other plugins)
System:
ios-deploy : 2.0.0
NodeJS : v8.12.0 (/usr/local/bin/node)
npm : 6.4.1
OS : macOS
Xcode : Xcode 9.4 Build version 9F1027a

Answer 2

It looks to me like your file transfer logic is not wrapped in a this.platform.ready() call. Could it be that there are times when this is called before platform ready (and thus, before the plugin is ready to be used)?