CGPDFDocument

CGPDFDocument is a class in the Core Graphics framework of Apple's iOS and macOS operating systems, designed to facilitate the manipulation and rendering of Portable Document Format (PDF) files. Introduced as part of the Core Graphics suite, it provides developers with a structured way to access and interact with PDF content programmatically.

The class allows developers to extract text, images, and other elements from PDF documents, as well as query metadata such as author, title, and creation date. It supports features like page enumeration, allowing applications to iterate through individual pages within a document. Additionally, CGPDFDocument enables the extraction of PDF objects, such as fonts, images, and annotations, which can be further processed or rendered.

One of its key functionalities is the ability to render PDF pages onto a graphics context, such as a Quartz 2D drawing surface. This is particularly useful for applications that require custom rendering or display of PDF content, such as document viewers or PDF-based interfaces. The class also supports PDF encryption, enabling secure handling of password-protected documents.

CGPDFDocument is built on top of the Core Graphics framework, which is optimized for performance and efficiency. It leverages low-level graphics operations to ensure smooth rendering and fast processing of PDF documents. While it does not provide high-level features like editing or annotating PDFs directly, it serves as a foundational tool for developers working with PDFs in their applications.

Developers typically use CGPDFDocument in conjunction with other Core Graphics classes, such as CGContext, to create custom PDF-based interfaces or integrate PDF viewing capabilities into their applications. Its simplicity and integration with Apple’s ecosystem make it a popular choice for developers working with PDFs on Apple platforms.