Question

I am trying to add a custom UIBarButtonItem to my navigationItem. This button will be available in all my view controllers. so instead of adding it to each viewDidLoad method in each viewDidLoad I am trying to add it in my application Delegate class in a seperate method that i will call in the viewDidLoad method.
Here is my Code:

 UIImage* image = [UIImage imageNamed:@"some-header-icon.png"];
CGRect frame = CGRectMake(0,0,image.size.width,image.size.height);
UIButton* hellBtn = [[UIButton alloc] initWithFrame:frame];
[hellBtn setBackgroundImage:image forState:UIControlStateNormal];
[hellBtn setShowsTouchWhenHighlighted:NO];
[hellBtn addTarget:self action:@selector(goToHell) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem* rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:hellBtn];
[self.nav.navigationController.navigationItem setRightBarButtonItem:rightBarButtonItem];
[hellBtn release];
[rightBarButtonItem release];

if I replace the same code blog in any viewDidLoad of any viewController and change

[self.nav.navigationController.navigationItem setRightBarButtonItem:rightBarButtonItem];

By:

[self.navigationItem setRightBarButtonItem:rightBarButtonItem];

It works perfectly.
Any Idea Why?

Answer 1

Create a subclass of UIViewController for ex. UIViewControllerBase, override viewDidLoad method and inside it create your rightBarButtonItem and set it. Then make all of your controllers inherit UIViewControllerBase – simple OOP scenario.