Global/Persistent UIBarButtonItem like Twitter's Compose Button?

I have a UINavigationController with alot of viewControllers, and I want to add a UIBarButtonItem to开发者_如何学Python the top-right. I did that, but I have to do this individually to each view controller. What's the best pattern to add it once and have it stay there throughout the app?

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Yes you can create a global function like in appDelegate and pass some parameters on that function. Like pass your navigationController,target,selector.

Here is sample code snippet.

- (UIBarbuttonItem *) rightBarButtonGlobal:(UINavigationItem*)navigationItem target:(id)target {
  //you can also pass nsstring for title and selector for you desired selector.
  //But as per your question I assume you want a application logo like button in navigation bar. If that is the case just pass navigationItem as parameter.Create your logo button and assign to navigationItem.
  //Allocate button here
  navigationItem.rightBarButtonItem = button;
  [button release];
}