On 06/11/2009, at 11:02 AM, Jon Nall wrote:
I have a helper function that encodes the component float values and
then the decoder creates a CGColorRef back from those.
+(void)encodeColor:(CGColorRef)theColor
withCoder:(NSCoder*)encoder
withKey:(NSString*)theKey
{
if(theColor != nil)
{
const CGFloat* components = CGColorGetComponents(theColor);
[encoder encodeFloat:components[0] forKey:[NSString
stringWithFormat:@"%[email protected]", theKey]];
[encoder encodeFloat:components[1] forKey:[NSString
stringWithFormat:@"%[email protected]", theKey]];
[encoder encodeFloat:components[2] forKey:[NSString
stringWithFormat:@"%[email protected]", theKey]];
[encoder encodeFloat:components[3] forKey:[NSString
stringWithFormat:@"%[email protected]", theKey]];
}
else
{
// Encode nil as NSNull
[encoder encodeObject:[NSNull null] forKey:theKey];
}
}
I'm still pretty new at this, though, so maybe others will know a
better way.
A slightly better way would be to extend NSCoder using a category,
then you can use it just as you would any other encode/decode method:
@interface NSCoder (CGColorRefCoding)
- (void) encodeCGColorRef:(CGColorRef) ref forKey:(NSString*) key;
- (CGColorRef) decodeCGColorRefForKey:(NSString*) key;
@end
You'd also have to store the colour space, number of components,
pattern and so on. It would probably be better to convert this
internally to an NSColor which supports NSCoding in order to deal with
this rather than assuming that it's a 4-component RGB colour as you
have here. Unfortunately NSColor and CGColorRef are not toll-free
bridged, and converting from one to the other can be pretty tricky to
cover all the possible variations. If you can use NSColor instead of
CGColorRef in your app, so much the better.
--Graham
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