ObjC to Swift : Doing some work inside setter

Objective-C

@property (assign) BOOL selected;

- (void) setSelected: (BOOL) aBool
{
    _selected = aBool;

    self.color = _selected ? [NSColor redColor] : [NSColor blackColor];
}

Swift

var selected: Bool = false
{
    didSet
    {
        self.color = selected ? NSColor.redColor() : NSColor.blackColor()
    }
}