Question

I am transferring data from FirstView to SecondView after clicking on a button.

FirstView.h
@property (strong, nonatomic) NSString  *stringOfFirstView; 

FirstView.m

 - (void)pushToSecond {
         SecondView *controller   =   [[SecondView alloc] initWithNibName:@"SecondView" bundle:nil];
         controller.stringOfSecondView          =   self.stringOfFirstView;
         [self.navigationController pushViewController:controller animated:NO];

        }

In SecondView, I have

SecondView.h
    @property (strong, nonatomic) NSString  *stringOfSecondView; 

At SecondView,my goal is to go back to FirstView by clicking on back button and also want assign stringOfSecondView to stringOfFirstView as well

Question :

How can I assign stringOfSecondView to stringOfFirstView via clicking back button.

Just let you know, I am detecting an click event on back button in SecondView by doing

SecondView.m
- (void) viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:YES];
    if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound)
        NSLog(@"will show onto console");  

} 

But I am stuck how to do passing data back

Please advice if you have any clues about this issue.

Answer 1

I would use a delegate. So in your SecondView you need to create a protocol that sends data back to your FirstView. Your FirstView would become a delegate of the SecondView. There are tons of tutorials on how to make a delegate.