Created
November 2, 2017 20:46
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UIImage extension for PDF documents
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import UIKit | |
extension UIImage { | |
convenience init?(pdfDocument: CGPDFDocument, pageNumber: Int = 1) { | |
guard let page = pdfDocument.page(at: pageNumber) else { return nil } | |
let size = page.getBoxRect(.mediaBox).size | |
UIGraphicsBeginImageContextWithOptions(size, true, UIScreen.main.scale) | |
let context = UIGraphicsGetCurrentContext()! | |
context.saveGState() | |
context.translateBy(x: 0.0, y: size.height) | |
context.scaleBy(x: 1.0, y: -1.0) | |
context.concatenate(page.getDrawingTransform(.mediaBox, rect: CGRect(origin: .zero, size: size), rotate: 0, preserveAspectRatio: true)) | |
context.drawPDFPage(page) | |
context.restoreGState() | |
let pdfImage = UIGraphicsGetImageFromCurrentImageContext()! | |
UIGraphicsEndImageContext() | |
guard let cgImage = pdfImage.cgImage else { return nil } | |
self.init(cgImage: cgImage) | |
} | |
} |
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