Adding Navigation button to the right side

Adding NavigationBar Button

UIImage *buttonImage = [UIImage imageNamed:@"image"];
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.frame = CGRectMake(0, 0, 50, 44);
        [button setImage:buttonImage forState:UIControlStateNormal];
        [button addTarget:self
                   action:@selector(nil)
         forControlEvents:UIControlEventTouchUpInside];
        UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
        self.navigationItem.rightBarButtonItem = barButtonItem;