You are probably thinking of core-plot , which would be a great solution if you want something that has many functions and is ready-made out of the box.
If you need something more minimal, you can easily create your own line chart of the UIView subclass and make it exactly what you want. Building a universal graph library is a big job because there are so many ways people like to change their graphs. If you know exactly what you want and do not need something more flexible, then you can quickly and effectively solve your own problems.
If you decide to tip over, Matt Gallagher Cocoa Lovingly has a number of very good graphic blog posts to get you started.
Caleb
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