CGPDFDocumentCreateWithData

CGPDFDocumentCreateWithURL is a function within the Core Graphics framework in Apple's operating systems, including macOS and iOS. Its primary purpose is to create a CGPDFDocument object from a PDF file located at a given URL. This function is fundamental for any application that needs to read, display, or process the content of PDF documents.

The function takes a URL object, which specifies the location of the PDF file, and returns a CGPDFDocument reference. If the PDF file cannot be accessed or is not a valid PDF document, the function will return nil. Once a CGPDFDocument object is created, developers can use other Core Graphics functions to interact with its content. This includes obtaining information about the document, such as the number of pages, and then accessing individual pages for rendering or manipulation.

CGPDFDocumentCreateWithURL is typically used when the PDF is to be loaded from a remote location, such as a website, or from a file path represented by a URL. It is a key component for building PDF viewers, editors, or any application that needs to integrate PDF functionality. The returned CGPDFDocument reference is an opaque type and should be explicitly released using CGPDFDocumentRelease when it is no longer needed to prevent memory leaks.