#define ACTIONEDIT  0
#define ACTIONADD   1
...
UISegmentedControl* segmentedControl = [[UISegmentedControl alloc] 
       initWithItems: [NSArray arrayWithObjects: 
         [UIImage imageNamed:@"icon-edit.png"], 
         [UIImage imageNamed:@"icon-add.png"],
         nil]
       ];
[segmentedControl addTarget:self 
                     action:@selector(segmentAction:) 
           forControlEvents:UIControlEventValueChanged];

segmentedControl.frame = CGRectMake(0, 0, 90, 30);
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
segmentedControl.momentary = YES;
[segmentedControl setEnabled:YES forSegmentAtIndex:ACTIONEDIT];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]
                       initWithCustomView:segmentedControl];

...

- (void)segmentAction:(id)sender
{
  UISegmentedControl* segCtl = sender;
  int action = [segCtl selectedSegmentIndex];
  switch (action) {
    case ACTIONADD:
     [self addToList];
     break;
    case ACTIONEDIT:
     [self editList];
     break;
  }
}

segmentedcontrol usage

Objective C