In iOS7 there are new API\'s for getting a font that is automatically adjusted to the text size the user has set in their preferences.
It looks something like this to
Just wanted to jump in and say that there's a library out there to help integrate custom fonts and deal with the Dynamic Type size changes. It's called, helpfully, Font (https://github.com/adamyanalunas/Font) and instead of being a magic solution it sets up a structure for handling each custom font differently while removing the boilerplate.
n.b. I'm the author of this lil' library and I think it's neat.