Hi Leo Hong,

Please make sure that the View (ex:UILabel) have a valid referencing outlet with the same name as the one you have used in binding provider. If the xib have been configured correctly, the following code should be able to help you binding SectionHeader of UICollectionView:

1. On binding provider, bind the label on header section using ItemBindingDescription with "Group" TargetBindingType. Example:

itemBinding.AddBinding("TextLabel", BindableProperties.TextProperty, new BindingDescription("Title"), TargetBindingType.Group);

2. On ViewModel, please make sure that GroupItems never return null but empty List instead. This is useful so BindingProvider could recognize your GroupItems. Example:

public override System.Collections.IEnumerable GroupItems {	get {
		return (base.GroupItems != null) ? base.GroupItems : new List ();
	}
	set {
		base.GroupItems = value;
	}
}

3. Please set your ViewController to used the defined View and to show Section Header. Example:

public override bool ShowSectionHeader
{
	get
	{
		return true;
	}
}
public override UIViewTemplate SectionHeaderTemplate
{
	get
	{
		return new UIViewTemplate(ItemCollectionViewHeader.Nib);
	}
}

note: ItemCollectionViewHeader should inherited from UICollectionReusableView.

That should allow you to bind the views in SectionHeader.

Best Regards,
Leo Chandra

I tried your sample code. It's ok for TextProperty or ImageSourceProperty, but CommandProperty of UIButton still does not work. No matter using AddBinding or AddViewModelBinding.

itemBinding.AddBinding("OKLabel", BindableProperties.TextProperty, "Title", TargetBindingType.Group);

itemBinding.AddBinding("OKButton", BindableProperties.TextProperty, "Title", TargetBindingType.Group);

itemBinding.AddViewModelBinding("OKButton", BindableProperties.CommandProperty, "OKCommand", TargetBindingType.Group);

itemBinding.AddBinding("OKButton", BindableProperties.CommandParameterProperty, ".", TargetBindingType.Group);

Hi Leo Hong,

We will investigate about this. Will get back on you as soon as I found any update on this.

Best Regards,
Leo Chandra

Hi Leo Hong,

We have update crosslight to support Command binding to UIButton on group header section. Please find the nightly build here. Please note that you need to use Unified API for it to work.

Best Regards,
Leo

It works, thank you

Hi Leo Hong,

Your welcome.

Best Regards,
Leo Chandra