What is the equivalent of CGPDFDocumentGetCatalog in Monotouch?

I'm trying to get the catalog of a PDF document but I cannot find CGPDFDocumentGetCata开发者_JS百科log. Is it unbound or am I just blind?

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MonoTouch.CoreGraphics.CGPDFDocument::GetCatalog() is the binding of CGPDFDocumentGetCatalog, see github.

However I only added this recently so you'll need MonoTouch 4.1 (or more recent) or add p/invoke directly into your code.