# init(consumer:mediaBox:_:) Creates a PDF graphics context. ``` init?(consumer: CGDataConsumer, mediaBox: UnsafePointer?, _ auxiliaryInfo: CFDictionary?) ``` ## Parameters `consumer` The data consumer to receive the PDF output data. `mediaBox` A pointer to a rectangle that defines the size and location of the PDF page, or `NULL`. The origin of the rectangle should typically be `(0,0)`. Core Graphics uses this rectangle as the default bounds of the page’s media box. If you pass `NULL`, Core Graphics uses a default page size of 8.5 by 11 inches (612 by 792 points). `auxiliaryInfo` A dictionary that specifies any additional information to be used by the PDF context when generating the PDF file, or `NULL`. The dictionary is retained by the new context, so on return you may safely release it. See [Auxiliary Dictionary Keys](/documentation/CoreGraphics/auxiliary-dictionary-keys) for keys you can include in the dictionary. ## Return Value A new PDF context, or `NULL` if the context cannot be created. In Objective-C, you’re responsible for releasing this object using [`CGContextRelease`](/documentation/CoreGraphics/CGContextRelease). ## Discussion This function creates a PDF drawing environment to your specifications. When you draw into the new context, Core Graphics renders your drawing as a sequence of PDF drawing commands that are passed to the data consumer object. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)