Show UIBarButtonItem just like Apple's iPad Mail App - objective-c

Question

Apple's iPad Mail app has a few icons that appear embedded in the setRightBarButtonItems area of the navigationItem of the detail view of the split view controller:
How can I add icons to the navigationItem bar like this (I have the icons already).
My issue is that the UIBarButtonItem class reference doesn't seem to have an appropriate UIBarButtonItemStyle that allows for no border around the button. I've tried configuring the UIBarButtonItem via initWithCustomView yet tapping the button doesn't work.
Thanks in advance for any suggestions
Cheers
EDIT: I could use UIBarButtonItemStylePlain however it doesn't look 'embedded' like the apple buttons, which is the look I am after.

Answer 1

I've worked it out and can produce the following result:
Here is the code I use. It could be optimised however is nice and repetitive for demonstration purposes:
- (void)setupNavigationItemButtons {
float buttonWidth = 60;
float buttonHeight = 40;
UIImage *imageA = [UIImage imageNamed:#"212-action2.png"];
UIImage *imageB = [UIImage imageNamed:#"111-user.png"];
UIImage *imageC = [UIImage imageNamed:#"122-stats.png"];
UIButton *buttonA = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, buttonWidth, buttonHeight)];
UIButton *buttonB = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, buttonWidth, buttonHeight)];
UIButton *buttonC = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, buttonWidth, buttonHeight)];
[buttonA addTarget:self action:#selector(doSomething:) forControlEvents:UIControlEventTouchUpInside];
[buttonB addTarget:self action:#selector(doSomethingElse:) forControlEvents:UIControlEventTouchUpInside];
[buttonC addTarget:self action:#selector(doSomethingRandom:)forControlEvents:UIControlEventTouchUpInside];
[buttonA setImage:imageA forState:UIControlStateNormal];
[buttonB setImage:imageB forState:UIControlStateNormal];
[buttonC setImage:imageC forState:UIControlStateNormal];
UIBarButtonItem *buttonItemA = [[UIBarButtonItem alloc] initWithCustomView:buttonA];
UIBarButtonItem *buttonItemB = [[UIBarButtonItem alloc] initWithCustomView:buttonB];
UIBarButtonItem *buttonItemC = [[UIBarButtonItem alloc] initWithCustomView:buttonC];
[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects:buttonItemA, buttonItemB, buttonItemC,nil]];
}