This is a project (Opensource library)of chart libraries which can used in iPhone/iPads.
Charts available:
1.Line Graph
2.Wall Graph
3.Bar Graph
4.Fragmented Bar Graph
5.Pie Chart
6.Fragmented Pie Chart
7.Cluster Chart


Complete GUIde can be found HERE
http://soulwithmobiletechnology.blogspot.com/2011/08/iphoneipad-chart-librarymimchartlib.html

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HOW TO USE IT IN YOUR CODE
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1. Add 2 frameworks for sure (QuartzCore and CoreText)
2. Copy and Paste "Lib Files" folder in your project and Also add them to your project by right clicking your project in XCode and choose "Add files to your project". Note "Lib Files" folder can be found under MIMChartLib > "Lib Files" in MIMChart Project.

3. Add the .csv file (Data file) to the project as well from which you will be reading the data. Check the sample codes to find out about csv data files OR go to GUIDE link provided above.

4. Then you can add the chart of your purpose to your view in your app.

To find out more about how to stick the chart in your view please see the sample codes.
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HOW TO RUN THE SAMPLE CODES IN THE LIBRARY.
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1. Go to MIMChartLibAppDelegate.m in MIMChartLib folder in XCode.

2. You will see various rootControllers. You can comment/uncomment one by one  and RUN the code to see what they look like. 
You can go to those Test Classes like TestClass,TestClassFragmented etc available in HowToUseFiles folder to get more idea.

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AND you can find more info on
http://soulwithmobiletechnology.blogspot.com/2011/08/iphoneipad-chart-librarymimchartlib.html