We make a drawing app called WebCode (http://www.webcodeapp.com/) which can import SVG and PSD files and export CSS+HTML or JavaScript+Canvas code. Of course, converting SVG files to CSS is not something you'd generally use it for, but it can be done :-)
His point is that you have to create complex custom controls on OSX, whereas in iOS it'll generally be sufficient to mix and match a few views and CoreAnimation, and use customization options not present in OSX.
Did you try WebCode (http://www.webcodeapp.com/)? It is a vector drawing app for Mac that instantly generates nice, clean and readable SVG code. You can also choose to generate HTML/CSS and JavaScript/Canvas code from your drawings.
I keep meaning to but haven't got round to coughing up the £35. It does look amazing and is (one direction) of the sort of thing I was talking about. I'd need to see the javascript it generates before I could happily include it a project.
We've made WebCode to make HTML5 game development in Canvas a bit easier. It is a vector drawing app that instantly generates JavaScript Canvas code, so you don't have to write it by hand.
We even have a little HTML5 game drawn entirely using JavaScript on our website: http://www.webcodeapp.com/
Writing drawing code like this by hand is really tedious and even though a lot of vector drawing apps output SVG code, it is usually quite complicated and ugly.
We make a vector drawing app called WebCode that instantly generates nice and readable SVG and JavaScript+Canvas code.
Our drawing app WebCode (http://www.webcodeapp.com) instantly generates nice and readable SVG code from your drawings. It also outputs JavaScript HTML5 Canvas code and HTML+CSS code.
Components are coming in future updates.