Question

is there something that can call a -(void) every time a view shows.
I am rotating between two views, so when i go to the second view and then return to the first view I want a void to be called automatically from the first view
I’ve try to do this with -(void)viewWillAppear:(BOOL)animated and – (void)viewDidLoad
by putting a NSLog in them but it doesn’t print when i return to the first view.
any suggestions?

Answer 1

If you are updating the first view with data from the second, use an observer on the model that is being updated. If the second view is being removed as a subview, you can observe the subviews. Alternatively, you can use a block callback closure.

In the interface:

IBAction(^doOnClose)(void);

and:

@property (nonatomic, copy) IBAction(^doOnClose)(void);

In the method that closes your second view:

if(doOnClose) doOnClose();

And finally to define it from your first view:

view2.doOnClose = ^{/*Do this when view 2 closes*/};