This week I did a presentation at the London iPhone Developer Group meeting. Given my experience with using lots of APIs, I thought it might be a good, if dry, topic. I tried to spice it up by complaining about lots of them and trying to condense that negativity into some useful lessons to take away.

Most of the other discussions of this subject that I’ve seen focus on designing libraries but I thought the same lessons could be applied to all kinds of interfaces, from Objective C libraries to REST API’s for connecting to web services. (I don’t mean to suggest that the focus of the two articles I link to is wrong. They’re both very much worth reading.)