Make custom back button's clickable area smaller in Navigation controller - iphone

Question

I've created a custom back button with the code below, however the clickable area is very big and goes well beyond the icon itself. Does anyone know how to set the clickable area, or make it the same size as the image?
Thanks
UIImage *buttonImage = [UIImage imageNamed:#"prefs"];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:buttonImage forState:UIControlStateNormal];
button.frame = CGRectMake(0, 0, buttonImage.size.width, buttonImage.size.height);
[button addTarget:self action: #selector(handleBackButton)
forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:button];
self.navigationItem.leftBarButtonItem = customBarItem;
The clickable area is shown in red.
Thanks!

Answer 1

If you want to prevent the click other than the button then add the custom button to UIView then set that view as custom view to the barbuttonItem
Your code will become like this :
UIImage *buttonImage = [UIImage imageNamed:#"prefs"];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:buttonImage forState:UIControlStateNormal];
button.frame = CGRectMake(0, 0, buttonImage.size.width, buttonImage.size.height);
[button addTarget:self action: #selector(handleBackButton)
forControlEvents:UIControlEventTouchUpInside];
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, buttonImage.size.width, buttonImage.size.height)];
[view addSubview:button];
UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:view];
self.navigationItem.leftBarButtonItem = customBarItem;
This should work as it worked for me.

Answer 2

#Prasad Devediga, swift version works greatly:
let btnName = UIButton()
btnName.setImage(UIImage(named: "settings_filled_25"), forState: .Normal)
btnName.frame = CGRectMake(0, 0, 30, 30)
btnName.addTarget(self, action: Selector("toggleRight"), forControlEvents: .TouchUpInside)
var rightView = UIView()
rightView.frame = CGRectMake(0, 0, 30, 30)
rightView.addSubview(btnName)
let rightBarButton = UIBarButtonItem()
rightBarButton.customView = rightView
self.navigationItem.rightBarButtonItem = rightBarButton