UIColor literals.

UIColor_literal.mm

#import <UIKit/UIKit.h>

UIColor * operator"" _c(unsigned long long color)
{
    unsigned long long redComponent = (color & 0xff0000 >> 16);
    unsigned long long greenComponent = (color & 0x00ff00) >> 8;
    unsigned long long blueComponent = color & 0xff;
    float red = redComponent / 255.0;
    float green = greenComponent / 255.0;
    float blue = blueComponent / 255.0;
    return [UIColor colorWithRed:red green:green blue:blue alpha:1.0];
}

Usage:
self.view.backgroundColor = 0x112233_c;

A colleague suggested that using bit shifts would be an alternative to all the maths on the first three lines. This is true. I didn't think of the problem that way :-)

/ 255.0 rather than 256.0 surely?

I just copied the code into my category class, and I noticed the same thing (i.e., should be / 255.0). Also, shouldn't line 5 be:

unsigned long long redComponent = (color & 0xff0000) >> 16;

Good spots, thanks.

Maybe make it OS X compatible by declaring:

  #if TARGET_OS_IPHONE
  #import <UIKit/UIKit.h>
  #else
     @compatibility_alias UIColor NSColor;
   #endif