Last week I worked on implementing a new statistics section of Spreaker iPhone app. Thanks to our graphic designer, the chart UI is beautiful to see and to interact with.
I started using an open source library, PNChart. It was a simple but nice library to work with. Soon I discovered limitations that prevent me from doing what I needed. So I forked the library and remove the issues founded.
The result of these work is in SPChart, a redesign chart library. Like PNChart, the drawing is animated and most of the cart handle touch events so you can be notified when the user tap of something in the chart.
At the end of all this work, I shared this new chart library on github. Hope the community will like it and fork it! At least I already like it :)