Created
April 25, 2015 09:24
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swift draw image on pdf
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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() | |
} |
Exactly what I was looking for. Even the PDF-on-top transparency works. Thanks!
how do you apply this to a uiview?
Thank you very much, you are a lifesaver!
I did convert it correctly to Swift 4.2
func drawOnPDF(path: String , signatureImage:UIImage) {
// Get existing Pdf reference
let pdf = CGPDFDocument(NSURL(fileURLWithPath: path))
// Get page count of pdf, so we can loop through pages and draw them accordingly
let pageCount = pdf?.numberOfPages
// Write to file
UIGraphicsBeginPDFContextToFile(path, CGRect.zero, nil)
// Write to data
//var data = NSMutableData()
//UIGraphicsBeginPDFContextToData(data, CGRectZero, nil)
for index in 1...pageCount! {
let page = pdf?.page(at: index)
let pageFrame = page?.getBoxRect(.mediaBox)
UIGraphicsBeginPDFPageWithInfo(pageFrame!, nil)
let ctx = UIGraphicsGetCurrentContext()
// Draw existing page
ctx!.saveGState()
ctx!.scaleBy(x: 1, y: -1)
ctx!.translateBy(x: 0, y: -pageFrame!.size.height)
//CGContextTranslateCTM(ctx, 0, -pageFrame.size.height);
ctx!.drawPDFPage(page!)
ctx!.restoreGState()
// Draw image on top of page
let image = signatureImage
image.draw(in: CGRect(x: 100, y: 100, width: 100, height: 100))
// Draw red box on top of page
//UIColor.redColor().set()
//UIRectFill(CGRectMake(20, 20, 100, 100));
}
UIGraphicsEndPDFContext()
}
This works only on first page of the pdf file. Using this code actually removes the actual content on pdf and replaces it with the new image if there more than one pages in the pdf.
thank you, it work to me .
What is the path?
@MerrickWang1, path is location to pdf file stored on local
Thanks :)
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Thanks man.. have been searching for this. What if I want to draw a semi transparent rectangle not an image?