PDFView

PDFView for ios

import UIKit

class PDFViewController: UIViewController, UIScrollViewDelegate {

    @IBOutlet weak var scrollView: UIScrollView!
    
    @IBOutlet weak var pageControl: UIPageControl!
    
    private var imageList: [UIImage] = []
    
    var fileName: String!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        if self.fileName == nil {
            self.showErrorAlert()
            return
        }
            
        self.readPDFDocument()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    @IBAction func changePage(sender: UIPageControl) {
    
        var frame = self.scrollView.frame
        frame.origin.x = CGFloat(frame.size.width) * CGFloat(self.pageControl.currentPage)
        frame.origin.y = 0
        
        self.scrollView.scrollRectToVisible(frame, animated: true)
    }
    
    func scrollViewDidScroll(scrollView: UIScrollView) {
        
        let pageWidth = self.scrollView.frame.size.width
        
        self.pageControl.currentPage = Int(floor((self.scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1)
    }

    private func readPDFDocument() {
        
        let fileManger = NSFileManager.defaultManager()
        
        let bundle = NSBundle.mainBundle()
        
        var url: NSURL! = nil
        
        if (fileManger.fileExistsAtPath(bundle.bundlePath + "/" + self.fileName)) {
            url = NSBundle.mainBundle().URLForResource(self.fileName, withExtension:nil)!
        } else {
            
            let doccumentDirectries = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
            
            let documentDirectory = doccumentDirectries.last as String
            
            if (fileManger.fileExistsAtPath(documentDirectory + "/" + self.fileName)) {
                
                url =  NSURL(fileURLWithPath: documentDirectory + "/" + self.fileName)
                
            } else {
                self.showErrorAlert()
                return
            }
        }
        
        let pdf = CGPDFDocumentCreateWithURL(url);
        let pageCount = CGPDFDocumentGetNumberOfPages(pdf)
        NSLog("pageCount %d",pageCount)
        
        self.pageControl.numberOfPages = Int(pageCount)
        
        var contentWidth: CGFloat = 0
        
        for (var i = 1; i <= Int(pageCount); i++) {
            
            let page = CGPDFDocumentGetPage(pdf, UInt(i))
            
            var pageRect = CGPDFPageGetBoxRect(page, kCGPDFMediaBox)
            let pdfScale = self.view.frame.size.width / pageRect.size.width
            pageRect.size = CGSize(width: pageRect.size.width * pdfScale,
                height: pageRect.size.height * pdfScale)
            pageRect.origin = CGPoint(x: pageRect.size.width * CGFloat(i-1), y: 0)
            
            contentWidth += CGFloat(pageRect.size.width)
            
            UIGraphicsBeginImageContext(pageRect.size)
            let context = UIGraphicsGetCurrentContext()
            CGContextSetRGBFillColor(context, 1.0, 1.0, 1.0, 1.0)
            CGContextFillRect(context, pageRect)
            CGContextSaveGState(context)
            CGContextTranslateCTM(context, 0.0, pageRect.size.height)
            CGContextScaleCTM(context, pdfScale, -pdfScale)
            CGContextDrawPDFPage(context, page)
            CGContextRestoreGState(context)
            
            let image = UIGraphicsGetImageFromCurrentImageContext()
            UIGraphicsEndImageContext()
            
            self.imageList.append(image)
            
            let imageView = UIImageView(image: image)
            imageView.frame = pageRect
            imageView.contentMode = UIViewContentMode.ScaleAspectFit
            
            self.scrollView.addSubview(imageView)
        }
        
        self.scrollView.contentSize = CGSize(width: contentWidth, height: self.scrollView.frame.height)
    }
    
    private func showErrorAlert() {
    
        let alertController = UIAlertController(title: "Error", message: "Fail Document!", preferredStyle: .Alert)
        
        alertController.addAction(
            UIAlertAction(title: "OK",
                style: UIAlertActionStyle.Default,
                handler:{ (action:UIAlertAction!) -> Void in
                
                    println("Cancel")
                    self.navigationController?.popViewControllerAnimated(true)
        }))
        
        self.presentViewController(alertController, animated: true, completion: nil)
    }
}