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Is it possible to open a pdf whilst it is being downloaded?

Does anyone know if you can start displaying a pdf document in iOS before it has finished downloading? I know PDF supports this but can it be done in iOS?

I am wondering if something can be done with CGPDFDocumentCreateWithProvide开发者_如何学Gor and a custom provider, but I can't find much useful information on CGDataProviders.

Any ideas?

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