How to display a dynamic graph plot on ipad using Xcode

I am learning how to develop for the ipad and I have a pretty big project to do.

I already have screens and buttons loaded on the ipad via IOS simulator, xcode and interface builder. My next task is to display a graph on the ipad that is updating its plots and points every 30 seconds or so.

If you've ever heard of California ISO, it shows peak demand for electricity in the united states http://www.caiso.com/outlook/SystemStatus.html and I basically want to create a graph that represents data in a similar way: it updates by itself on the ipad.

Again I am using 开发者_运维百科xcode and interface builder. I don't know where to begin at all haha

Call -reloadData on your graph whenever you have new data to display. It will query your datasource for the new data and redraw the plots.