ComPDFKit

#import <ComPDFKit/ComPDFKit.h>
- (void)viewDidLoad {
  [super viewDidLoad];
  // Get the path of a PDF
  NSString *pdfPath = @"...";
  // Initialize a CPDFDocument object with the path to the PDF file
  NSURL *url = [NSURL fileURLWithPath:pdfPath];
  CPDFDocument *document = [[[CPDFDocument alloc] initWithURL:url] autorelease];
  if (document.error && document.error.code != CPDFDocumentPasswordError) {
    return;
  }
  // Initialize a CPDFView object with the size of the entire screen
  CPDFView *pdfView = [[[CPDFView alloc] initWithFrame:self.view.bounds] autorelease];
  // Set the document to display
  pdfView.document = document;
  
  // Add the pdfView to the root view
  [self.view addSubview:pdfView];
}