- (IBAction)AgregarButton:(id)sender {
    NSEntityDescription *desc = [NSEntityDescription entityForName:@"Persona" inManagedObjectContext:_context];
    NSManagedObject *agregarPersona = [[NSManagedObject alloc]initWithEntity:desc insertIntoManagedObjectContext:_context];
    UIAlertView *alerta;
    NSError *error;
    if ([_AddTextField.text isEqualToString:@""]) {
        alerta = [[UIAlertView alloc]
                  initWithTitle:@"Error"
                  message:@"No se puede agregar, campo de texto en blanco"
                  delegate:nil
                  cancelButtonTitle:@"Ok"
                  otherButtonTitles:nil, nil];
        [alerta show];
    } else {
        [agregarPersona setValue:_AddTextField.text forKey:@"nombre"];
        alerta = [[UIAlertView alloc]
                  initWithTitle:@"Aviso"
                  message:[NSString stringWithFormat:@"Se ha agregado a: %@" , _AddTextField.text]
                  delegate:nil
                  cancelButtonTitle:@"Ok"
                  otherButtonTitles:nil, nil];
        [alerta show];
    }
    if (![_context save:&error]) {
        NSLog(@"%@" , error.localizedDescription);
    }
}