Auto align axis horizontal vs vertical

[championofblocks]

This is surely the wrong way round?

case ALAxisVertical:
   layoutAttribute = NSLayoutAttributeCenterX;
   break;
case ALAxisHorizontal:
   layoutAttribute = NSLayoutAttributeCenterY;
   break;

Or perhaps I'm misunderstanding here? I would expect a horizontal axis alignment to centre along the X axis and a vertical axis alignment to centre along the Y axis.

[smileyborg]

This has been raised previously, see here: smileyborg/UIView-AutoLayout#16

Take a close look at the definitions of the attributes as well as this illustration: https://github.com/smileyborg/PureLayout/blob/master/Images/PureLayout-CommonAttributes.png