UIImage extension to get image with required size from pdf vector

extension UIImage {

static func fromPDF(filename: String, size: CGSize) -> UIImage? {
    guard let path = Bundle.main.path(forResource: filename, ofType: "pdf") else { return nil }
    let url = URL(fileURLWithPath: path)
    guard let document = CGPDFDocument(url as CFURL) else { return nil }
    guard let page = document.page(at: 1) else { return nil }

    let imageRect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
    if #available(iOS 10.0, *) {
        let renderer = UIGraphicsImageRenderer(size: size)
        let img = renderer.image { ctx in
            UIColor.white.withAlphaComponent(0).set()
            ctx.fill(imageRect)
            ctx.cgContext.translateBy(x: 0, y: size.height)
            ctx.cgContext.scaleBy(x: 1.0, y: -1.0)
            ctx.cgContext.concatenate(page.getDrawingTransform(.artBox, rect: imageRect, rotate: 0, preserveAspectRatio: true))
            ctx.cgContext.drawPDFPage(page);
        }

        return img
    } else {
        // Fallback on earlier versions
        UIGraphicsBeginImageContextWithOptions(size, false, 2.0)
        if let context = UIGraphicsGetCurrentContext() {
            context.interpolationQuality = .high
            context.setAllowsAntialiasing(true)
            context.setShouldAntialias(true)
            context.setFillColor(red: 1, green: 1, blue: 1, alpha: 0)
            context.fill(imageRect)
            context.saveGState()
            context.translateBy(x: 0.0, y: size.height)
            context.scaleBy(x: 1.0, y: -1.0)
            context.concatenate(page.getDrawingTransform(.cropBox, rect: imageRect, rotate: 0, preserveAspectRatio: true))
            context.drawPDFPage(page)
            let image = UIGraphicsGetImageFromCurrentImageContext()
            UIGraphicsEndImageContext()
            return image
        }
        return nil
    }
}