Flip UIImage Along Either Axis

Question

I\'m trying to create a method which flips a UIImage along the X axis, Y axis, or both. I keep getting close but my transform knowledge isn\'t good enough to get all the way

Answer 1

This is merely a slightly fixed and 'updated to Swift' version of the old answer by @ultramiraculous. Just in case it helps someone.

Vertical Flip (reflection over x-axis):

func flipV(im:UIImage)->UIImage {
    var newOrient:UIImageOrientation
    switch im.imageOrientation {
    case .Up:
        newOrient = .DownMirrored
    case .UpMirrored:
        newOrient = .Down
    case .Down:
        newOrient = .UpMirrored
    case .DownMirrored:
        newOrient = .Up
    case .Left:
        newOrient = .LeftMirrored
    case .LeftMirrored:
        newOrient = .Left
    case .Right:
        newOrient = .RightMirrored
    case .RightMirrored:
        newOrient = .Right
    }
    return UIImage(CGImage: im.CGImage, scale: im.scale, orientation: newOrient)
}

Horizontal Flip (reflection over y-axis)

func flipH(im:UIImage)->UIImage {
    var newOrient:UIImageOrientation
    switch im.imageOrientation {
    case .Up:
        newOrient = .UpMirrored
    case .UpMirrored:
        newOrient = .Up
    case .Down:
        newOrient = .DownMirrored
    case .DownMirrored:
        newOrient = .Down
    case .Left:
        newOrient = .RightMirrored
    case .LeftMirrored:
        newOrient = .Right
    case .Right:
        newOrient = .LeftMirrored
    case .RightMirrored:
        newOrient = .Left
    }
    return UIImage(CGImage: im.CGImage, scale: im.scale, orientation: newOrient)
}