Setting a CGPDFObjectRef to value

Does anyone have a way to change the information contained in a CGPDFObjectRef? Basically since CGPDFObject can represent any of the subtypes (CGPDFInteger, ie.) you would think you could set an existing CGPDFObjectRef that is type integer to an integer; however, I have played with this for quite some time with no success and was wondering if anyone had come across a solution that i mis开发者_JS百科sed?

No, the CGPDF API is pretty much read-only.