NSMenu Services Example

JPAppDelegate.m

@implementation JPAppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    [NSApp registerServicesMenuSendTypes:[NSArray arrayWithObjects:NSStringPboardType, nil] returnTypes:[NSArray arrayWithObjects:nil]];
    
    [self updateMenu];
}

#pragma mark - Services

- (id)validRequestorForSendType:(NSString *)sendType returnType:(NSString *)returnType
{
    if ([sendType isEqual:NSStringPboardType]) {
        return self;
    }
    return nil;
}

- (BOOL)writeSelectionToPasteboard:(NSPasteboard *)pboard types:(NSArray *)types
{
    if ([types containsObject:NSStringPboardType] == NO) {
        return NO;
    }
    [pboard declareTypes:@[NSStringPboardType] owner:nil];
    
    return [pboard setString:@"The String Here" forType:NSStringPboardType];
}

#pragma mark - Methods

- (void)updateMenu
{
    [self.menu removeAllItems];
    
    NSMenuItem *servicesMenuItem = [[NSMenuItem alloc] initWithTitle:@"Services" action:nil keyEquivalent:@""];
    NSMenu *servicesMenu = [[NSMenu alloc] initWithTitle:@"Services"];
    [servicesMenuItem setSubmenu:servicesMenu];
    [[NSApplication sharedApplication] setServicesMenu:servicesMenu];
    [self.menu addItem:servicesMenuItem];
}

@end