An extension to the UIColor class for working with hexadecimal representations.

UIColor+Hexadecimal.h

#import <UIKit/UIKit.h>

@interface UIColor (Hexadecimal)

/**
 *  Convenience method for creating a UIColor object from a hexadecimal 
 *  representation.
 *
 *  @param hexcode A color in hexadecimal represenation
 *  @param alpha The alpha (opacity) percentage
 *  @return An autoreleased UIColor instance
 */
+ (UIColor *)colorWithHexCode:(NSUInteger)hexcode alpha:(CGFloat)alpha;

@end

UIColor+Hexadecimal.m

#import "UIColor+Hexadecimal.h"

@implementation UIColor (Hexadecimal)

+ (UIColor *)colorWithHexCode:(NSUInteger)hexcode alpha:(CGFloat)alpha {
    NSUInteger mask = 0xFF0000;
    
    CGFloat r = (((hexcode & mask) >> 16) / 255.0); mask >>= 8;
    CGFloat g = (((hexcode & mask) >> 8) / 255.0); mask >>= 8;
    CGFloat b = ((hexcode & mask) / 255.0);
    
    return [UIColor colorWithRed:r green:g blue:b alpha:alpha];
}

@end