Pass value to parent controller when dismiss the controller

Question

I want to send data to parentviewcontroller but the following code crashes. Give me the solution

Post *vc;
vc.abc =@\"Comment Conttroller\";
[self.parentView         


        

Answer 1

vc doesn't seem to be initialized.

You can probably do this,

vc = (Post *)self.parentViewController;
vc.abc = @"Comment Conttroller";
[vc dismissModalViewControllerAnimated:YES];

Since the view controller you want to affect is the parentViewController, you should be able to cast and set the abc property.

Answer 2

Take this in .h file in ParentViewController

NSString *strABC;

Make below function in ParentViewController

-(void)setString:(NSString *)strEntered{
    strABC=strEntered;
}

Now In Post view controller do like this:

ParentViewController *objSecond = 
  [[ParentViewController] initwithNibName:@"parentView.xib" bundle:nil];

[objSecond setString:@"Comment Controller"];
[self.navigationController pushViewController:objSecond animated:YES];
[objSecond release];

Now, In secondViewController viewWillAppear method write this.

-(void)viewWillAppear:(BOOL)animated{
      lblUserInput.text = strABC;
}

Please check spelling mistakes as I've hand written this. Hope this help.

If you are not using UINavigationContoller then you can do something like this.

SecondViewControler *objSecond = 
  [[SecondViewController] initwithNibName:@"secondview.xib" bundle:nil];
[objSecond setUserInput:txtUserInput.text];
[objSecond viewWillAppear:YES];
[self.view addSubview:objSecond];
[objSecond release];

Answer 3

Put this in your parent controller in viewDidLoad

// get register to fetch notification  
[[NSNotificationCenter defaultCenter] addObserver:self
                                      selector:@selector(yourNotificationHandler:)
                                      name:@"MODELVIEW DISMISS" object:nil];
// --> Now create method in parent class as;
// Now create yourNotificationHandler: like this in parent class
-(void)yourNotificationHandler:(NSNotification *)notice{
    NSString *str = [notice object];
}

Put following to your child class where

-(void)dissmissModelView{

    [self dismissModalViewControllerAnimated:YES];
    NSLog(@"DismissModalviewController");

    //raise notification about dismiss 
    [[NSNotificationCenter defaultCenter] 
          postNotificationName:@"MODELVIEW DISMISS" 
                        object:@"Whatever you want to send to parent class"];  
}

as soon as model view get dismiss yourNotificationHandler get executed and whatever you pass as an objet will get fetch in your parent class. Please ask if still need some clarification.