Re-render UIImage with .Up orientation if it has different orientation. Swift.

AdjustImageOrientation.swift

func normalizeImageOrientationIfNeeded(image: UIImage) -> UIImage {
	if image.imageOrientation == .Up {
		return image
	}

	let size = image.size
	let scale = image.scale
	let rect = CGRectMake(0, 0, size.width, size.height)
	
	UIGraphicsBeginImageContextWithOptions(size, false, scale)
	image.drawInRect(rect)
	let newImage = UIGraphicsGetImageFromCurrentImageContext()
	UIGraphicsEndImageContext()
	
	return newImage
}