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Photoshop style color picker for iOS. Doesn't use images, very lightweight and complete.
Source includes two controls that work in unison with each other to provide users the ability to pick color in a fashion identical to photoshop.
Designed not to use images or any other external dependencies beyond the classes.
This control presents a saturation and brightness gradient for a specific hue, similar to photoshop's color picker.
This control presents a horizontal gradient that displays the entire range of hues. Typically, user would pick a hue, which updates an ILSaturationBrightnessPicker so that they can then pick the saturation and brightness.
This category will allow you to access the HSB values of a UIColor easily.
This is the base view that implements some stuff to make writing custom views a little easier.