Create CGColor from HTML/CSS/Hex color string

gistfile1.m

static CGColorRef CGColorCreateWithCSSColor( NSString * string )
{
	union {
		struct {
#if LITTLE_ENDIAN
			uint8 alpha ;
			uint8 blue ;
			uint8 green ;
			uint8 red ;
#else
			uint8 red ;
			uint8 green ;
			uint8 blue ;
			uint8 alpha ;
#endif
		} each ;
		uint32 rgba ;
	} color = { 0 } ;
	
	color.each.alpha = 0xFF ;
	
	const char * cString = [ string cStringUsingEncoding:NSUTF8StringEncoding ] ;
	const char * p = cString ;
	if ( *p == '#' ) { ++p ; }
	
	int32_t shift = 28 ;
	while( *p != 0 )
	{
		uint8 value = *p & 0xf ;
		if ( *p > 0x41 ) { value += 9 ; }
		
		color.rgba |= ( value << shift ) ;
		
		shift -= 4 ;
		++p ;
	}
	
	CGColorRef result = CGColorCreateGenericRGB( (CGFloat)color.each.red / 255.0f, (CGFloat)color.each.green / 255.0f, (CGFloat)color.each.blue / 255.0f, (CGFloat)color.each.alpha / 255.0f ) ;
	return result ;
}