Why do these 2 UIGraphics drawing operations produce images of different sizes?

 Convert CGPDFPage to UIImage

This article is to help readers understanding about converting CGPDFPage to UIImage.

The CgpdfDocument has the CGPDFPage class, which stores all of the pages in a PDF document into a single memory page. This means that all the text, shapes, images and graphical objects that make up a particular page are drawn from a ready-made drawing bitmap on the CgpdfMemoryPage. In almost every case, this bitmap is drawn from a PNG file without any compression.

I’ll put together a sample project to showcase all of this information, and walk you through how creating a PDF document from scratch. We'll begin by creating a new Xcode project, and follow through with adding some basic starter features to make a functional app quickly.

Converting CGPDFDocument to UIImage

As the name implies, this class is designed to convert CGPDFDocument to UIImage. To do this, we first need to create an instance of the class.

The next step is to create a CGPDFPage from the PDFDocument. We will use CGPDFPageCreateWithURL to do this. CGPDFPageCreateWithURL is a convenience function that takes a CGPDFDocumentRef as a parameter and creates a CGPDFPage with the document.

Once we have the CGPDFPage, we can create a UIImage from it. We use CGPDFPageGetImage to create the UIImage.

To do this, we use CGPDFPageGetDrawingTransform and CGPDFPageGetDrawingTransforms to get the page drawing transforms and drawing transforms. We use these to convert the PDF page into a UIImage.

We can then add the UIImage to our view. We can now test this conversion method by creating a PDFDocument from scratch. We’ll begin by creating a new Xcode project. I’ve named my project “CGPDFCreateFromScratch.” We’ll use the AppDelegate as our starting point. We’ll create a new class, which will be our AppDelegate. We’ll name it CGPDFCreateFromScratchAppDelegate. We’ll start by adding a new UIViewController subclass. We’ll name it CGPDFCreateFromScratchViewController.

In the new file, we’ll add a view controller to the project, and we’ll name it RootViewController. We’ll add a UIView to the view, and we’ll name it RootView.

Next, we’ll create a new file, which will be our PDFDocument class.  We’ll name it CGPDFCreateFromScratchDocument. We’ll add a new class to the project, and we’ll name it CGPDFCreateFromScratchDocument. We’ll add a new file to the project, and we’ll name it CGPDFCreateFromScratchDocument.

Next, we’ll create a new file, which will be our PDFDocument subclass. We’ll name it CGPDFCreateFromScratchDocument. We’ll add a new class to the project, and we’ll name it CGPDFCreateFromScratchDocument. We’ll add a new file to the project, and we’ll name it CGPDFCreateFromScratchDocument.

We’ll add a new file to the project, and we’ll name it CGPDFCreateFromScratchDocument.

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