一个不相关的UIViewController的viewDidLoad被调用

Question

While debugging a problem, I noticed that when changing orientation, the viewDidLoad of an unrelated UIViewController is getting called.

It appears to be unrelated to my problem, but it's totally weird.

This UIViewController is accessible only from the UITabBar (in the storyboard itself)

Answer 1

If testing this on iOS 8, you can look at the view controller hierarchy by running the app, pausing execution by hitting the "pause" button:

Then, at the (lldb) prompt, enter the command

po [UIViewController _printHierarchy]

This can identify which view controllers are in the view hierarchy.