vertically align text in a CATextLayer?

Question

I am working on a CATextLayer that I want to use in both Mac and iOS. Can I control the vertical alignment of the text within the layer?

In this particular case, I

Answer 1

The code for Swift 3, based on code @iamktothed

If you use an attributed string for setting font properties, than you can use function size() from NSAttributedString to calculate height of string. I think this code also resolve the problems described by @Enix

class LCTextLayer: CATextLayer {

    override init() {
        super.init()
    }

    override init(layer: Any) {
        super.init(layer: layer)
    }

    required init(coder aDecoder: NSCoder) {
        super.init(layer: aDecoder)
    }

    override open func draw(in ctx: CGContext) {

        if let attributedString = self.string as? NSAttributedString {

            let height = self.bounds.size.height
            let stringSize = attributedString.size()
            let yDiff = (height - stringSize.height) / 2

            ctx.saveGState()
            ctx.translateBy(x: 0.0, y: yDiff)
            super.draw(in: ctx)
            ctx.restoreGState()
        }
    }
}