public enum PDFPage {
    case WhitePage(CGSize)
    case View(UIView)
    case Image(UIImage)
    case ImagePath(String)
    case Binary(NSData) // Add
    case ImageRef(CGImageRef) // Add
}

    let imageData = NSData(contentsOfFile: imagePath)!
    let imageData2 = NSData(contentsOfFile: imagePath2)!
    let pdfData = try! PDFGenerator.generate([imageData1, imageData2])

    let pdfData = try! PDGenerator.generate([
        PDFPage(.Binary(imageData)),
        PDFPage(.ImageRef(imageref))
    ])