Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

Convert PDF to UIImage

func drawOnPDF(path: String)
{
    // Get existing Pdf reference
    let pdf = CGPDFDocumentCreateWithURL(NSURL(fileURLWithPath: path))

    // Get page count of pdf, so we can loop through pages and draw them accordingly
    let pageCount = CGPDFDocumentGetNumberOfPages(pdf);

    // Write to file
    UIGraphicsBeginPDFContextToFile(path, CGRectZero, nil)

    // Write to data
//        var data = NSMutableData()
//        UIGraphicsBeginPDFContextToData(data, CGRectZero, nil)

    for index in 1...pageCount {
        let page = CGPDFDocumentGetPage(pdf, index)
        let pageFrame = CGPDFPageGetBoxRect(page, kCGPDFMediaBox)

        UIGraphicsBeginPDFPageWithInfo(pageFrame, nil)

        var ctx = UIGraphicsGetCurrentContext()

        // Draw existing page
        CGContextSaveGState(ctx);
        CGContextScaleCTM(ctx, 1, -1);
        CGContextTranslateCTM(ctx, 0, -pageFrame.size.height);
        CGContextDrawPDFPage(ctx, page);
        CGContextRestoreGState(ctx);

        // Draw image on top of page
        var image = UIImage(named: "signature3")
        image?.drawInRect(CGRectMake(100, 100, 100, 100))
        // Draw red box on top of page
        //UIColor.redColor().set()
        //UIRectFill(CGRectMake(20, 20, 100, 100));
    }

    UIGraphicsEndPDFContext()
}

My problem is PDF convert to image but how to open image in View then swipe left,right,up and down how to possible

like image 725
Bhargav Avatar asked Sep 16 '15 09:09

Bhargav


4 Answers

All these solution converts a single pdf page into an UIImage. Here is my findings for converting multiple page pdf into a single image

func drawPDFfromURL(url: URL) -> UIImage? {
        guard let document = CGPDFDocument(url as CFURL) else { return nil }

        var width: CGFloat = 0
        var height: CGFloat = 0
        
        // calculating overall page size
        for index in 1...document.numberOfPages {
            print("index: \(index)")
            if let page = document.page(at: index) {
                let pageRect = page.getBoxRect(.mediaBox)
                width = max(width, pageRect.width)
                height = height + pageRect.height
            }
        }

        // now creating the image
        let renderer = UIGraphicsImageRenderer(size: CGSize(width: width, height: height))

        let image = renderer.image { (ctx) in
            ctx.cgContext.scaleBy(x: 1.0, y: -1.0)
            for index in 1...document.numberOfPages {
                
                if let page = document.page(at: index) {
                    let pageRect = page.getBoxRect(.mediaBox)
                    ctx.cgContext.translateBy(x: 0.0, y: -pageRect.height)
                    ctx.cgContext.drawPDFPage(page)
                }
            }
            
            ctx.cgContext.scaleBy(x: 1.0, y: -1.0)
        }
        return image
    }
like image 169
Ratul Sharker Avatar answered Oct 14 '22 08:10

Ratul Sharker


Swift 3:

func convertPDFPageToImage(page:Int) {

    let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    let filePath = documentsURL.appendingPathComponent("pathLocation").path

    do {

        let pdfdata = try NSData(contentsOfFile: filePath, options: NSData.ReadingOptions.init(rawValue: 0))

        let pdfData = pdfdata as CFData
        let provider:CGDataProvider = CGDataProvider(data: pdfData)!
        let pdfDoc:CGPDFDocument = CGPDFDocument(provider)!
        pageCount = pdfDoc.numberOfPages;
        let pdfPage:CGPDFPage = pdfDoc.page(at: page)!
        var pageRect:CGRect = pdfPage.getBoxRect(.mediaBox)
        pageRect.size = CGSize(width:pageRect.size.width, height:pageRect.size.height)

        print("\(pageRect.width) by \(pageRect.height)")

        UIGraphicsBeginImageContext(pageRect.size)
        let context:CGContext = UIGraphicsGetCurrentContext()!
        context.saveGState()
        context.translateBy(x: 0.0, y: pageRect.size.height)
        context.scaleBy(x: 1.0, y: -1.0)
        context.concatenate(pdfPage.getDrawingTransform(.mediaBox, rect: pageRect, rotate: 0, preserveAspectRatio: true))
        context.drawPDFPage(pdfPage)
        context.restoreGState()
        let pdfImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()            

        self.imageView.image = pdfImage

    }
    catch {

    }

}
like image 23
Blain Ellis Avatar answered Oct 14 '22 10:10

Blain Ellis


I have found a cool solution. Borrowed from here: https://www.hackingwithswift.com/example-code/core-graphics/how-to-render-a-pdf-to-an-image

func drawPDFfromURL(url: URL) -> UIImage? {
    guard let document = CGPDFDocument(url as CFURL) else { return nil }
    guard let page = document.page(at: 1) else { return nil }

    let pageRect = page.getBoxRect(.mediaBox)
    let renderer = UIGraphicsImageRenderer(size: pageRect.size)
    let img = renderer.image { ctx in
        UIColor.white.set()
        ctx.fill(pageRect)

        ctx.cgContext.translateBy(x: 0.0, y: pageRect.size.height)
        ctx.cgContext.scaleBy(x: 1.0, y: -1.0)

        ctx.cgContext.drawPDFPage(page)
    }

    return img
}
like image 25
JackieHendrixon Avatar answered Oct 14 '22 09:10

JackieHendrixon


I Got the Solution for Pdf page convert in UIImage. This code PDF Page convert in Uiimage and save in image document directory. PDF Download And Page Count to separate Page vise image convert.

    func drawOnPDF(path: String)
    {
        var urlstr: NSURL = NSURL.fileURLWithPath(path)!
        var pdf: CGPDFDocumentRef = CGPDFDocumentCreateWithURL(urlstr)
        var page: CGPDFPageRef;
        var frame: CGRect = CGRectMake(0, 0, 100, 200)
        var pageCount: Int = CGPDFDocumentGetNumberOfPages(pdf);
        for (var i = 0; i < pageCount; i++)
        {
            var mypage: CGPDFPageRef = CGPDFDocumentGetPage(pdf, i+1)
            frame = CGPDFPageGetBoxRect(mypage, kCGPDFMediaBox)
            UIGraphicsBeginImageContext(CGSizeMake(600, 600*(frame.size.height/frame.size.width)))
            var ctx: CGContextRef = UIGraphicsGetCurrentContext()
            CGContextSaveGState(ctx)
            CGContextTranslateCTM(ctx, 0.0, frame.size.height)
            CGContextScaleCTM(ctx, 1.0, -1.0)
            CGContextSetGrayFillColor(ctx, 1.0, 1.0)
            CGContextFillRect(ctx, frame)
            page = CGPDFDocumentGetPage(pdf, i + 1)
            var pdfTransform: CGAffineTransform = CGPDFPageGetDrawingTransform(page, kCGPDFMediaBox, frame, 0, true)
            CGContextConcatCTM(ctx, pdfTransform);
            CGContextSetInterpolationQuality(ctx, kCGInterpolationHigh)
            CGContextSetRenderingIntent(ctx, kCGRenderingIntentDefault)
            CGContextDrawPDFPage(ctx, page)
            var thumbnailImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()
            CGContextRestoreGState(ctx)
            var documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).last! as! String 
            documentsPath = documentsPath.stringByAppendingFormat("/Page%d.png", i+1)
            UIGraphicsEndImageContext()
            imagedata = UIImagePNGRepresentation(thumbnailImage)
            imagedata.writeToFile(documentsPath, atomically: true)
            array.addObject(documentsPath)
        }
        let dirPath = array.objectAtIndex(0) as? String
        let image    = UIImage(contentsOfFile: dirPath!)
        NSUserDefaults.standardUserDefaults().setObject(array, forKey: "Array")
        println("\(array)")
    }
like image 32
Bhargav Avatar answered Oct 14 '22 08:10

Bhargav