Can i know in viewWillAppear that it was called after navigationController pop (back button)?

Question

Say I have UIViewController A and B. User navigates from A to B with a push segue. Than user presses back button and comes to A.

Now viewWillAppear

Answer 1

Add a BOOL property to UIViewController A:

@property (nonatomic) BOOL alreadyAppeared;

Then in your viewWillAppear: method, add:

if (!self.alreadyAppeared) {
    self.alreadyAppeared = YES;
    // Do here the stuff you wanted to do on first appear
}