By searching a bit I found many libraries to create some charts for the iPhone. Just want to ask if someone has ever worked with a library where the end user can touch the graph and edit it. For example touch a bar graph and make a bar taller or shorter and get back the value.
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you should be able to accomplish this with core plot. the built in touch tracking can tell you where the user is touching, from there you’d just change the height of that bar and reload the graph.