The document defines color constants for red, green, blue, and alpha channel values to create a UIColor, defines hexadecimal values for text and background colors, and includes an interface for a UIColor category that allows creating a color from a hexadecimal value.

38. [UIColor colorWithRed:0.1 green:0.1 blue:0.1 alpha:1.0];
[UIColor colorWithHex:COLOR_TEXT_BASE];
#define COLOR_TEXT_BASE
0x330000
#define COLOR_BG_SELECTED
0x92760B
#define COLOR_LITE_GRAY
0x9C9C9C
@interface UIColor (Hex)
+ (UIColor *)colorWithHex:(UInt32)hex;
@end

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