Category for AppKit that converts an NSColor to a CGColor (ala UIColor in the iOS)

gistfile1.txt

//
//  NSColor+CGColor.m
//
//  Created by Michael Sanders on 11/19/10.
//

#import <AppKit/AppKit.h>

@interface NSColor (CGColor)

//
// The Quartz color reference that corresponds to the receiver's color.
//
@property (nonatomic, readonly) CGColorRef CGColor;

//
// Converts a Quartz color reference to its NSColor equivalent.
//
+ (NSColor *)colorWithCGColor:(CGColorRef)color;

@end

NSColor+CGColor.m

//
//  NSColor+CGColor.m
//
//  Created by Michael Sanders on 11/19/10.
//

#import "NSColor+CGColor.h"

@implementation NSColor (CGColor)

- (CGColorRef)CGColor
{
    const NSInteger numberOfComponents = [self numberOfComponents];
    CGFloat components[numberOfComponents];
    CGColorSpaceRef colorSpace = [[self colorSpace] CGColorSpace];

    [self getComponents:(CGFloat *)&components];

    return (CGColorRef)[(id)CGColorCreate(colorSpace, components) autorelease];
}

+ (NSColor *)colorWithCGColor:(CGColorRef)CGColor
{
    if (CGColor == NULL) return nil;
    return [NSColor colorWithCIColor:[CIColor colorWithCGColor:CGColor]];
}

@end

To use under garbage collected environment:

replace

return (CGColorRef)[(id)CGColorCreate(colorSpace, components) autorelease];

with

#ifdef __OBJC_GC__  
return (CGColorRef)CFMakeCollectable(CGColorCreate(colorSpace, components));
#else
return (CGColorRef)[(id)CGColorCreate(colorSpace, components) autorelease];
#endif

how can we use this with ARC?