RotateImage.swift

let image = UIImage(named: "images.jpeg")!

let degrees: Double = 90
let rads = CGFloat(M_PI * degrees / 180)
UIGraphicsBeginImageContext(CGSizeMake(image.size.height, image.size.width))
let ctx = UIGraphicsGetCurrentContext()

CGContextTranslateCTM(ctx, image.size.height/2, image.size.width/2)
CGContextRotateCTM(ctx, rads)
CGContextScaleCTM(ctx, 1.0, -1.0)
CGContextDrawImage(ctx, CGRectMake(-image.size.width/2, -image.size.height/2, image.size.width, image.size.height), image.CGImage)

let flippedImg = UIGraphicsGetImageFromCurrentImageContext()

UIGraphicsEndImageContext()