NSColor sometimes mutating to NSColorWell

Question

I have a class that handles a lot of defaults, here is how I initialize the defaults:

+ (void) initialize
{
    NSUserDefaults* defaults=[NSUserDefaults standardUserDefaults];
    NSData* colorData= [NSKeyedArchiver archivedDataWithRootObject: [NSColor orangeColor]];
    NSDictionary* def= @{ @"colorKey" : colorData, ... };
    [defaults registerDefaults: def];
}

Then I make available one method for reading the default color and one method for setting it:

- (NSColor*) color
{
    NSUserDefaults* defaults=[NSUserDefaults standardUserDefaults];
    NSData* colorData= [defaults objectForKey: colorKey];
    return [NSKeyedUnarchiver unarchiveObjectWithData: colorData];
}

- (void) setColor: (NSColor*) color
{
    NSUserDefaults* defaults=[NSUserDefaults standardUserDefaults];
    NSData* colorData= [NSKeyedArchiver archivedDataWithRootObject: color];
    [defaults setObject:colorData forKey: colorKey];
}

But if inside the color: method I print the color, sometimes it's of class NSColorWell and it creates troubles inside the application.

Answer 1

NSColorWell is an NSControl according to https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSColorWell_Class/Reference/Reference.html, so it looks like that you are mistakenly calling setColor: with NSColorWell instance instead of NSColor.