Swift : How to Rotate a UIImage 90 degrees?

In Swift and Objective-C, the easiest way (and thread safe too) is to do:

//assume that the image is loaded in landscape mode from disk

UIImage * LandscapeImage = [UIImage imageNamed: imgname];

UIImage * PortraitImage = [[UIImage alloc] initWithCGImage: LandscapeImage.CGImage scale: 1.0 orientation: UIImageOrientationRight];

This only modifies the orientation data of the image - the pixel data is untouched. For some applications, this may not be enough.

Or in swift:

let PortraitImage  : UIImage = UIImage(CGImage: LandscapeImage.CGImage , scale: 1.0 , orientation: UIImageOrientation.Right)

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