How to pass a value to parent view controller? [duplicate]

Answer 1

I have the second view controller presenting itself as modal in this example:

In the second view controllers h file:

@protocol SecondViewControllerDelegate 
- (void)addItemViewController:(id)controller didFinishEnteringItem:(NSString *)item;
@end

@interface SecondPageViewController : UIViewController 
{
     NSString *previouslyTypedInformation;
}

@property (weak, nonatomic) IBOutlet UITextView *textView;
@property (nonatomic) NSString *previouslyTypedInformation;
@property (nonatomic, weak) id  delegate;

In the second view controllers m file make sure to synthesize properties and add then add this:

- (IBAction)done:(id)sender
{
     NSString *itemToPassBack = self.textView.text;
     NSLog(@"returning: %@",itemToPassBack);
     [self.delegate addItemViewController:self didFinishEnteringItem:itemToPassBack];
     //dismiss modal view controller here
}

Then in the first view controllers h file set it as delegate:

 @interface FirstPageViewController: UIViewController 
 @property (nonatomic) NSString *returnedItem;

Then in the first view controller's m file synthesize and add the method:

- (void)addItemViewController:(SecondPageViewController *)controller didFinishEnteringItem:    (NSString *)item
{
    //using delegate method, get data back from second page view controller and set it to property declared in here
    NSLog(@"This was returned from secondPageViewController: %@",item);
    self.returnedItem=item;

    //add item to array here and call reload
}

Now you have the text of what was returned! You can add the string to your array in the first view controller's viewDidLoad and call

[self.tableView reloadData]; 

and it should work.