Fist Image Orientation Swift

func fixOrientation (image: UIImage) -> UIImage {
        if (image.imageOrientation == UIImageOrientation.Up){
            return image
        }
        
        var transform = CGAffineTransformIdentity;
        
        switch (image.imageOrientation) {
        case UIImageOrientation.Down, UIImageOrientation.DownMirrored:
            transform = CGAffineTransformTranslate(transform, image.size.width, image.size.height);
            transform = CGAffineTransformRotate(transform, CGFloat(M_PI));
            break;
            
        case UIImageOrientation.Left,  UIImageOrientation.LeftMirrored:
            transform = CGAffineTransformTranslate(transform, image.size.width, 0);
            transform = CGAffineTransformRotate(transform, CGFloat(M_PI_2));
            break;
            
        case UIImageOrientation.Right, UIImageOrientation.RightMirrored:
            transform = CGAffineTransformTranslate(transform, 0, image.size.height);
            transform = CGAffineTransformRotate(transform, CGFloat(-M_PI_2));
            break;
        case UIImageOrientation.Up, UIImageOrientation.UpMirrored:
            break;
        }
        
        switch (image.imageOrientation) {
        case UIImageOrientation.UpMirrored, UIImageOrientation.DownMirrored:
            transform = CGAffineTransformTranslate(transform, image.size.width, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
            
        case UIImageOrientation.LeftMirrored, UIImageOrientation.RightMirrored:
            transform = CGAffineTransformTranslate(transform, image.size.height, 0);
            transform = CGAffineTransformScale(transform, -1, 1);
            break;
        case UIImageOrientation.Up, UIImageOrientation.Down, UIImageOrientation.Left, UIImageOrientation.Right:
            break;
        }
        
        var ctx = CGBitmapContextCreate(nil, UInt(image.size.width), UInt(image.size.height),
            CGImageGetBitsPerComponent(image.CGImage), 0,
            CGImageGetColorSpace(image.CGImage),
            CGImageGetBitmapInfo(image.CGImage));
        CGContextConcatCTM(ctx, transform);
        switch (image.imageOrientation) {
        case UIImageOrientation.Left, UIImageOrientation.LeftMirrored, UIImageOrientation.Right, UIImageOrientation.RightMirrored:
            CGContextDrawImage(ctx, CGRectMake(0,0,image.size.height,image.size.width), image.CGImage);
            break;
            
        default:
            CGContextDrawImage(ctx, CGRectMake(0,0,image.size.width,image.size.height), image.CGImage);
            break;
        }
        
        var cgimg = CGBitmapContextCreateImage(ctx);
        var img = UIImage(CGImage: cgimg)
        return img!;
    }