CODEWITHSUNDEEP
iosobjective-cuistoryboardseguerootviewpoptoviewcontroller
user3662854
user3662854

Reputation:

Pass Data using popToRootViewController

So I have a basic app, here is how it works. I have a root view controller called A and a table view controller called B. And when the user selects a row in B I pop back to the root view controller A.

And what I am trying to do is to pass the data of the row that was selected as a NSString back to the root view controller A. And then use this string to "do something" depending on the string.

I have tried using the NSNotification method but then I can't use the string to do something.

Heres what I have tried:

//tableViewB.m
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [[NSNotificationCenter defaultCenter] postNotificationName:@"passData" object:[[_objects objectAtIndex:indexPath.row] objectForKey:@"title"]];
    [self.navigationController popToRootViewControllerAnimated:YES];
}
//rootViewA.m
-(void)dataReceived:(NSNotification *)noti
{
     NSLog(@"dataReceived :%@", noti.object);

}
-(void)viewDidLoad {
  [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(dataReceived:) name:@"passData" object:nil];
}

What I am trying to do is some more like you can do when you push a viewController and use the perpareForSegue Method.

Thanks in advance for your help.

Upvotes: 3

Views: 2750

Answers (3)

Jogendra.Com
Jogendra.Com

Reputation: 6454

Try this may be help full 

    MyAController *myController = (MyAController *)[self.navigationController.viewControllers objectAtIndex:0];
    myController.myText = @"My String" ;
    [self.navigationController popToViewController:myController animated:YES];

I have use many time this .. It's working fine .. Note : replace your class name and string in this . Thanks :)

Upvotes: 0

nmh
nmh

Reputation: 2503

Use delegate: it would be better than NSNotification

tableView.h:

@protocol tableViewDelegate
-(void) tableViewSelectRowWithString:(NSString*)str;
@end

@interface tableView:UITableViewController //or something like this

@property(nonatomic,weak) id<tableViewDelegate> delegate;

tableView.m:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath     {
[self.delegate tableViewSelectRowWithString:@"your string"];
[self.navigationController popToRootViewControllerAnimated:YES];
}

-(void) dealloc{self.delegate = nil;}

//rootViewA.h

@interface rootViewA : UIViewController<tableViewDelegate>

//rootViewA.m

//When create tableView and push view:
tableView *t = ....;
tableView.delegate = self

-(void) tableViewSelectRowWithString:(NSString*)str{//use string}

Upvotes: 1

danh
danh

Reputation: 62686

You're doing the right thing but with the wrong parameters. The object: param in the notification post is the sending object. There's another post method that allows the caller to attach userInfo: as follows:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    // notice the prettier, modern notation
    NSString *string = _objects[indexPath.row][@"title"];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"passData"
                                                        object:self
                                                      userInfo:@{"theString" : string }]
    [self.navigationController popToRootViewControllerAnimated:YES];
}

On the receiving end, just get the data out of the notification's user info with the same key:

-(void)dataReceived:(NSNotification *)notification {

     NSLog(@"dataReceived :%@", notification.userInfo[@"theString"]);
}

Upvotes: 1

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