public override void ViewDidLoad() { base.ViewDidLoad(); // Perform any additional setup after loading the view, typically from a nib. var TranslatedNumber = string.Empty; TranslateButton.TouchUpInside += (object sender, EventArgs e) => { var Translator = new PhoneTranslator(); TranslatedNumber = Translator.ToNumber(PhoneNumberText.Text); if (string.IsNullOrWhiteSpace(TranslatedNumber)) { CallButton.SetTitle("Llamar", UIControlState.Normal); CallButton.Enabled = false; } else { CallButton.SetTitle($"Llamar al {TranslatedNumber}", UIControlState.Normal); CallButton.Enabled = true; } }; CallButton.TouchUpInside += (object sender, EventArgs e) => { var URL = new Foundation.NSUrl($"tel:{TranslatedNumber}"); if (!UIApplication.SharedApplication.OpenUrl(URL)) { var alert = UIAlertController.Create("No Soportado.", "El esquema 'tel:' no es soportado por este dispositivo", UIAlertControllerStyle.Alert); alert.AddAction(UIAlertAction.Create("Ok", UIAlertActionStyle.Default, null)); PresentViewController(alert, true, null); } }; }