Fits the calling size into the provided while retaining aspec ratio

Size Preserving Aspect Ratio.swift

extension CGSize {

    func sizeFittingPreservingAspectRatio(_ otherSize: CGSize) -> CGSize {
        if height <= width {
            let scaledWidth = (otherSize.height / height) * width
            return CGSize(width: scaledWidth, height: otherSize.height)
        } else {
            let scaledHeight = (otherSize.width / width) * height
            return CGSize(width: otherSize.width, height: scaledHeight)
        }
    }

}