CODEWITHSUNDEEP
objective-cios
JSanchez
JSanchez

Reputation: 35

Identify when I return to ViewController

I have two views with their controllers. The application start with the FirstViewController. Then with a button I open the SecondViewController.

With other button I dismiss the SecondViewController to return to FirstViewController.

Is there any way to detect that in FirstViewController that it has recovered focus?

EDIT: Ok I look the answers and I use viewWillAppear but don't work if I use a UIModalPresentationFormSheet.

-(IBAction)openSecondView{
    SecondViewController *screen = [[SecondViewController alloc] initWithNibName:nil bundle:nil];
    screen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    screen.modalPresentationStyle = UIModalPresentationFormSheet;
    [self presentModalViewController:screen animated:YES];
    [screen release];
}

And close this view with close button.

viewWillAppear never called.

Upvotes: 0

Views: 149

Answers (5)

sarosh
sarosh

Reputation: 1

inside the viewWillAppear of the FirstViewController

- (void) viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    NSLog(@"view 1 focused");
}

Upvotes: 0

dbgrman
dbgrman

Reputation: 5681

Depends how you are setting up the first view controller. Encapsulate it within UINavigationViewController (and if you do not want the navigation bar, you can always set it to hidden ( [self.navigationController.navigationBar setHidden:YES] ). ViewWillAppear will work then.

Upvotes: 0

Denis
Denis

Reputation: 6413

implementation of the viewWillAppear: callback will work only if you use navigation controller or tabbarcontroller for displaying another controller + with such approach you will need to check somehow if this is only the first appearance of the view, or was called by any other reason;

using a delegate, as described by Gomathi above is a much better option!

Upvotes: 0

Ilanchezhian
Ilanchezhian

Reputation: 17478

Add a delegate (Protocol) method. Call the delegate method just before dismissing the SecondViewController.

For more info on delegate, see delegate

Upvotes: 1

aahsanali
aahsanali

Reputation: 3547

implement UIViewController's viewWillAppear method

- (void) viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];

}

Upvotes: 2

Related Questions