public DeliveringView()
 {
     InitializeComponent();
     dvm = new DeliveringViewModel();
     mainGrid.BindingContext = dvm;
     gif.IsAnimationPlaying  = true;
 }
 public DeliveringView(Func <bool, Task> callback)
 {
     InitializeComponent();
     dvm = new DeliveringViewModel();
     mainGrid.BindingContext = dvm;
     FrContent.Opacity       = 1;
     this.callback           = callback;
     UpdateData(0);
     EmpezarTimer();
 }