Who's responsible for creating the MainViewController instance in the iPhone NavBar example

Question

I'm exploring the NavBar example from the iPhone dev center.

More specifically, I'm trying to understand where the MainViewController object is instantiated and I simply can't find where this is happening.

The only references to the MainViewController class is in AppDelegate, where there is a forward declaration and #import. However, removing these sentences doesn't affect the program whatsoever.

The object is probably created in the nib file, but again, I can't find it.

I really like the Xcode development environment. What I don't like, however, is that there are some many different places where objects can be created/connected that it makes it really hard to understand somebody else's code.

Any help will be appreciated.

Answer 1

If you look in the MainWIndow.xib file and click the disclosure triangle next to "Navigation Controller", you'll see an instance of MainViewController. This was created by dragging a "View Controller" object from the Library and then changing its Class.