protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
if (Spinner == null)
{
Spinner = new UIActivityIndicatorView
{
ActivityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge,
BackgroundColor = UIColor.Gray,
};
Spinner.Layer.CornerRadius = 10;
NativeView.AddSubview(Spinner);
Spinner.TranslatesAutoresizingMaskIntoConstraints = false;
NativeView.AddConstraint(NSLayoutConstraint.Create(
Spinner, NSLayoutAttribute.CenterX, NSLayoutRelation.Equal,
NativeView, NSLayoutAttribute.CenterX, (nfloat)1.0, (nfloat)0.0));
NativeView.AddConstraint(NSLayoutConstraint.Create(
Spinner, NSLayoutAttribute.CenterY, NSLayoutRelation.Equal,
NativeView, NSLayoutAttribute.CenterY, (nfloat)1.0, (nfloat)0.0));
NativeView.AddConstraint(NSLayoutConstraint.Create(
Spinner, NSLayoutAttribute.Width, NSLayoutRelation.Equal,
(nfloat)1.0, (nfloat)100));
NativeView.AddConstraint(NSLayoutConstraint.Create(
Spinner, NSLayoutAttribute.Height, NSLayoutRelation.Equal,
(nfloat)1.0, (nfloat)100));
}
if (e.NewElement is PopContentPage page)
{
page.PropertyChanged += IsBusyChanged;
SetIsBusy();
}
if (e.OldElement is PopContentPage page2)
{
page2.PropertyChanged -= IsBusyChanged;
}
}