Tell ActivityIndicator to show yourself and then navigate to another page

Question

On Xamarin.Forms Project, I am trying to tellActivityIndicator to show yourself and then navigate to another page

activityIndicatorObject = new ActivityIndicator()
                {
                    HorizontalOptions = LayoutOptions.CenterAndExpand,
                    Color = Color.Red,
                    IsVisible = false,
                    IsRunning = false,
                    IsEnabled = false,
                    BindingContext = this,
                };
ViewBookButton = new Button{ Text = "view book" };
ViewBookButton.Clicked += ViewBook;
protected void ViewBook(Object sender,EventArgs e)
            {
                //Go To View Book Page 
                activityIndicatorObject .IsVisible = true;
                activityIndicatorObject .IsRunning = true;
                activityIndicatorObject .IsEnabled = true;
                activityIndicatorObject .SetBinding(ActivityIndicator.IsVisibleProperty, "IsBusy");
                this.IsBusy = true;
                Navigation.PushAsync(new BookPage());
                this.IsBusy = false;
            }

ActivityIndicator doesn't showing? How I can make it showing?

Answer 1

As I understand you tell ActivityIndicator show yourself and then navigate to another page. And new page hasn't own ActivityIndicator. I would like to suggest you make your hard operations in OnAppearing method of BookPage.

protected override void OnAppearing()
{
    base.OnAppearing();

    activityIndicator.IsVisible = true;

    // Some hard operations

    activityIndicator.IsVisible = false;
}

Or use binding instead of activityIndicator.IsVisible = true;