Enhanced Dynamic Type. As mentioned at the outset, Apple has put
in a lot of work to optimize how Dynamic Type handles itself at
its largest sizes. New this year are options for even larger sizes
that smartly adapt to various user interfaces. The Dynamic Type
API, available for third-party developers to hook up to their
apps, has been updated to take advantage of this new capability.
I can’t say enough good things about Dynamic Type — and that’s before the improvements in iOS 11. I need text to be a click or two bigger than the default size on my iPhone. What I love about Dynamic Type is that it doesn’t look like a special “big type for bad eyes” mode. It just looks normal, but with larger type. You don’t have to give up the aesthetic satisfaction of having everything look just right in order to have larger type that you can read.