Question

At some point in my application workflow, I have one showing UIViewController. And as I press the Home button, I leave the application, leaving it running in the background.

However, when I return to the app, I would like the showing UIViewController not to appear again. I would like it to be removed or destroyed or anything like that.

How can I accomplish that?

Answer 1

You may add observer to UIApplicationDidEnterBackgroundNotification in your viewcontroller class. Try this in the init method:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(enterBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];

then in the enterBackground method, you can pop or dismiss your viewcontroller.

remember call this

[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil];

in the dealloc