NSNotification Not Received from Modal ViewController - ios

Question

What am I missing here? I'm just trying to send a simple notification from a modal view controller back to the view controller that launched it, but nothing gets received.
This is the code in the view controller that launches the modal segue:
- (IBAction) chooseSuperGroup:(UIButton *)sender {
NSLog(#"super group choice about to be made");
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(choiceReceived:)
name:#"selectionMade"
object:self];
}
- (void) choiceReceived: (NSNotification *) notification
{
NSLog(#"here");
if ([[notification name] isEqualToString:#"selectionMade"]) {
NSLog(#"received");
NSLog(#"%#", (NSString *)[notification userInfo]);
}
[[NSNotificationCenter defaultCenter] removeObserver:self
name: #"selectionMade"
object:self];
}
Then, over in the modal view controller, this code executes when the user selects a cell from the table view:
NSDictionary *dict = [NSDictionary dictionaryWithObject:selection forKey:#"superGroup"];
NSLog(#"printing dictionary contents");
for (id key in dict) {
NSLog(#"key: %# object: %#", key, [dict objectForKey:key]);
}
[[NSNotificationCenter defaultCenter] postNotificationName:#"selectionMade" object:self userInfo:dict];
My output looks like this:
Super group choice about to be made
printing dictionary contents
key: superGroup object: myChoice
So the choice is captured and added to a dictionary. But there is no evidence of any notification being received. This can't be that hard, but I'm not seeing my mistake. Can someone help me? Thanks!

Answer 1

Try using 'nil' instead of 'self'
// Add Observer
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(choiceReceived:) name:#"selectionMade" object:nil];
// Remove Observer
[[NSNotificationCenter defaultCenter] removeObserver:self
name: #"selectionMade"
object:nil];
// Post Notification
[[NSNotificationCenter defaultCenter] postNotificationName:#"selectionMade" object:nil userInfo:dict];
refer:https://stackoverflow.com/a/8188759/2449268