category

UIColor Category for Specifying Packed RGB Values

iOS's UIColor class makes it pretty easy to specify a color using red, green, blue (RGB) and alpha components:

 // set pale yellow color
 label.textColor = [UIColor colorWithRed:1.0
                                   green:1.0
                                    blue:0.5
                                   alpha:1.0];

However, as with many Cocoa API's, it's pretty verbose. Web developers would specify that color using the hexcode shorthand #ffff80, and many graphics editing tools would generate a hexcode value like that rather than values in the range 0.0–1.0.

So I made a simple category on UIColor that lets one write stuff like this:

#include "UIColor+KDJPackedRGB.h"

// ...

// set pale yellow color
label.textColor = [UIColor colorWithRGB24:0xffff80];

See https://gist.github.com/kristopherjohnson/5606209

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