xamarinmac 
namespace AppKit
{
    [Introduced(PlatformName.MacOSX, 10, 11, PlatformArchitecture.All, null)]
    [Register("NSCollectionViewFlowLayout", true)]
    public class NSCollectionViewFlowLayout : NSCollectionViewLayout
    {
        [BindingImpl(BindingImplOptions.GeneratedCode | BindingImplOptions.Optimizable)]
        [Export("sectionAtIndexIsCollapsed:")]
        [Introduced(PlatformName.MacOSX, 10, 12, PlatformArchitecture.All, null)]
        public virtual bool SectionAtIndexIsCollapsed(nuint sectionIndex);
    }
}
nuget.org
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Reference this API
Xamarin macOS 0.0
Information specific to xamarinmac
Assembly

Xamarin.Mac , Version=0.0.0.0, PublicKeyToken=84e04ff9cfb79065

Referencing

The API is automatically referenced.

Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API