Añade un círculo rojo con un texto en blanco al icono de la aplicación en el dock

-(void) updateApplicationIcon:(int) theNumber:(NSRect) theRect{
	// get the current app icon
	NSImage *appImage = [NSImage imageNamed:@"NSApplicationIcon"];
 
	// create a new image and draw the app icon onto it
	NSImage *image = [[NSImage alloc] initWithSize:[appImage size]];
 
	// lock focus on the new image and draw the app icon onto it.
	// you'll want the image flipped so text shows up correctly
	[image setFlipped:TRUE];
	[image lockFocus];
	NSSize appSize = [appImage size];	
	[appImage compositeToPoint:NSMakePoint(0, appSize.height) 
					 operation:NSCompositeSourceOver];
 
	// draw red circle
	NSBezierPath *redCircle = [NSBezierPath bezierPathWithOvalInRect:NSMakeRect(8,43,45,45)];
	[[NSColor redColor] setFill];
	[redCircle fill];
 
	// draw whatever else you want onto the image
	NSArray *values = [NSArray arrayWithObjects:[NSColor whiteColor], [NSFont fontWithName:@"Tahoma" size:32], nil];
	NSArray *keys = [NSArray arrayWithObjects:NSForegroundColorAttributeName, NSFontAttributeName, nil];
 
	NSDictionary *attrs = [NSDictionary dictionaryWithObjects:values forKeys:keys];
	NSString *caption= [NSString stringWithFormat:@"%d", theNumber];
	NSAttributedString *text= [[NSAttributedString alloc] initWithString:caption attributes:attrs];
	[text drawInRect:theRect];
 
	// unlock focus and set the new image as the dock icon
	[image unlockFocus];
	[NSApp setApplicationIconImage:image];
}