I needed to chart some data for an iPad app. Here’s some options I’ve found in my research:
I looked on StackOverflow but there was no clear winner: http://stackoverflow.com/questions/7254882/line-graphs-on-ios
Some suggest writing your own with CoreGraphics; some mention ShinobiControls (see screenshot above), which costs like $1,000 and that was a deterrent for me trying it. EDIT: They do seem on top of their customer support though. ;) http://www.shinobicontrols.com/shinobicharts/price-plans/
This is what most people suggest. It does apparently anything you want. But it’s on Google Code and the documentation is awful.
Unofficial Github Mirror: https://github.com/djw/core-plot
If you’re not doing native work, I should mention Sencha has some pretty nice looking stuff: http://dev.sencha.com/deploy/touch-charts-1.0.0/examples/
However, I am only building native apps, so it doesn’t help me that much.
Or you could use Google Charts.
That ended up working great for the quick nice chart I needed. Hope this helps you. If you’ve used other tools, please let me know by commenting below.