I want to change a button color in my app by selecting color. Instead of setting the color as static, I want user to choose the color like this 
or any API to use for objective c. Can anyone guide me how to proceed?
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If you look at how the code works in these classes from this open source project you should be able to integrate it into your view.
http://maniacdev.com/2011/11/open-source-ios-color-picker-components-roundup/
Hope this helps!
Sam