Split UIImage in half?

Question

How would I go about splitting a UIImage In half(down the middle) so it would make two images?

Answer 1

iOS 11, swift 4.0 updated version https://stackoverflow.com/users/893872/durul-dalkanat which I think to be honest is the best :)

This splits an image into 4 parts

func splitImage(image2D: UIImage) -> [UIImage] {
    let imgWidth = image2D.size.width / 2
    let imgHeight = image2D.size.height / 2
    var imgImages:[UIImage] = []

    let leftHigh = CGRect(x: 0, y: 0, width: imgWidth, height: imgHeight)
    let rightHigh = CGRect(x: imgWidth, y: 0, width: imgHeight, height: imgHeight)
    let leftLow = CGRect(x: 0, y: imgHeight, width: imgWidth, height: imgHeight)
    let rightLow = CGRect(x: imgWidth, y: imgHeight, width: imgWidth, height: imgHeight)

    let leftQH = image2D.cgImage?.cropping(to:leftHigh)
    let rightHQ = image2D.cgImage?.cropping(to:rightHigh)
    let leftQL = image2D.cgImage?.cropping(to:leftLow)
    let rightQL = image2D.cgImage?.cropping(to:rightLow)

    imgImages.append(UIImage(cgImage: leftQH!))
    imgImages.append(UIImage(cgImage: rightHQ!))
    imgImages.append(UIImage(cgImage: leftQL!))
    imgImages.append(UIImage(cgImage: rightQL!))

    return imgImages
}