// create a toolbar to have two buttons in the right
UIToolbar* tools = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 90.0, 44.01)];
	
// create the array to hold the buttons, which then gets added to the toolbar
NSMutableArray* buttons = [[NSMutableArray alloc] initWithCapacity:2];

// create a standard "add" button
UIButton *btnAdd = [[UIBarButtonItem alloc]
		  initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(add)];
[buttons addObject:btnAdd];
[btnAdd release];

// create a "edit" button
UIButton *btn = [[UIBarButtonItem alloc]
		  initWithTitle:@"Edit" style:UIBarButtonItemStyleBordered target:self action:@selector(edit)];
[buttons addObject:btnEdit];
[btnEdit release];
		
// stick the buttons in the toolbar
[tools setItems:buttons animated:NO];
[buttons release];
	
// and put the toolbar in the nav bar
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:tools];
[tools release];

Add 2 UIButtons to a UINavigationBar right item

Objective C