ViewController upon navigate back from previous controller

Question

If my setup is:

View Controller A => View Controller B

Were I to hit the back button on View Controller B

Is there a function that gets called on View Controller A

Answer 1

Oh ...

ViewDidAppear / ViewWillAppear ... that was simple

Answer 2

You can use this

-(IBAction)gotopreviousviewControllerButtonAction:(id)sender

 {

    [self.navigationController popViewControllerAnimated:YES];

 }