extension UIImage {
    func image(withRotation radians: CGFloat) -> UIImage {
        let cgImage = self.cgImage!
        let LARGEST_SIZE = CGFloat(max(self.size.width, self.size.height))
        let context = CGContext.init(data: nil, width:Int(LARGEST_SIZE), height:Int(LARGEST_SIZE), bitsPerComponent: cgImage.bitsPerComponent, bytesPerRow: 0, space: cgImage.colorSpace!, bitmapInfo: cgImage.bitmapInfo.rawValue)!

        var drawRect = CGRect.zero
        drawRect.size = self.size
        let drawOrigin = CGPoint(x: (LARGEST_SIZE - self.size.width) * 0.5,y: (LARGEST_SIZE - self.size.height) * 0.5)
        drawRect.origin = drawOrigin
        var tf = CGAffineTransform.identity
        tf = tf.translatedBy(x: LARGEST_SIZE * 0.5, y: LARGEST_SIZE * 0.5)
        tf = tf.rotated(by: CGFloat(radians))
        tf = tf.translatedBy(x: LARGEST_SIZE * -0.5, y: LARGEST_SIZE * -0.5)
        context.concatenate(tf)
        context.draw(cgImage, in: drawRect)
        var rotatedImage = context.makeImage()!

        drawRect = drawRect.applying(tf)

        rotatedImage = rotatedImage.cropping(to: drawRect)!
        let resultImage = UIImage(cgImage: rotatedImage)
        return resultImage
    }
}