How to recognize a button press for programmatic UIButton Xcode - objective-c

Question

Im using this code to create UIBarButtons programmatically on my Navigation Bar, how can I set the Buttons to send IBActions programmatically. I.O.W. how can I programmatically place a view to recognize the UITapGestureRecognizer(set the touchUpInside event) and connect it to an IBAction?
self.navigationController.navigationBar.tintColor = [UIColor colorWithRed:153/256.0 green:204/256.0 blue:51/256.0 alpha:1.0];
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
self.navigationController.navigationBar.titleTextAttributes = [NSDictionary dictionaryWithObject:[UIColor whiteColor] forKey:NSForegroundColorAttributeName];
self.navigationItem.title = #"Feed";
UIBarButtonItem *cameraItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:nil];
UIBarButtonItem *postItem = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:#"myIcon.png"] style:UIBarButtonItemStyleBordered target:self action:nil];
UIBarButtonItem *addPlusItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:nil];
UIBarButtonItem *optionsItem = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:#"myIcon2.png"] style:UIBarButtonItemStyleBordered target:self action:nil];
NSArray *cameraAndPostItem = #[cameraItem, postItem];
NSArray *addPlusAndOptionsItem = #[optionsItem, addPlusItem];
self.navigationItem.leftBarButtonItems = cameraAndPostItem;
self.navigationItem.rightBarButtonItems = addPlusAndOptionsItem;
EDIT: I am trying to perform a segue when the user presses the UIBarButtonItem, which I have implemented programmatically.

Answer 1

set the target and the action of the buttons
UIBarButtonItem *cameraItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:nil];
cameraItem.target = self;
cameraItem.action = #selector(cameraItemButtonInvoked);
//or short
UIBarButtonItem *cameraItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:#selector(cameraItemButtonInvoked)];
...
- (IBAction)cameraItemButtonInvoked {
.... // e.g.
[self performSegueWithIdentifier:#"ShowDetail" sender:sender];
}

Answer 2

You'll be setting the action to UIBarButton like this:
UIBarButtonItem *addPlusItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:#selector(addSomething:)];
Note the action part, there you are passing the selector to be called. Write that selector in your ViewController like this:
- (void) addSomething:(id)sender{
NSLog(#"I'm adding something..");
}
Do the same for rest of the buttons.