Question

I received the notification so I handle it like so

-(void) dateSelected:(NSNotification *) notification
{
NSLog(@"Value: %@", [[notification userInfo] valueForKey:@"date"] );
NSMutableDictionary * dateDict = [[NSDictionary alloc] initWithDictionary:[notification userInfo]];
NSLog(@"The Date Dict: %@", dateDict );
}

The logs I get are

2012-07-20 11:32: TestApp[10701:40b] Value: (null)
2012-07-20 11:32: TestApp[10428:40b] The Date Dict: {
}

If I NSLog out the notification itself it looks valid:

2012-07-20 11:33: TestApp[10457:40b] Notification: NSConcreteNotification 0x16629460 {name = date_selected_; object = {
date = 20120705;
}}

I’ve done this before and its worked.

I’m sure its simple, but today I cannot see the issue.

Any help would be appreciated.

Thanks,
-Code

Answer 1

It’s pretty simple, look at your log output … There’s no userInfo set in your notification. There’s just name and object. Compare your output with this one …

NSNotification *notification = [NSNotification notificationWithName:@"NAME"
  object:self
  userInfo:[NSDictionary dictionaryWithObjectsAndKeys:@"obj", @"key", nil]];
NSLog( @"NOT: %@", notification );

…

NOT: NSConcreteNotification 0x73586f0 {name = NAME;
object = <CMAppDelegate: 0x884a4e0>; userInfo = {
    key = obj;
}}

… see the difference? There’s name, object, but also userInfo in log output.

So the answer is – your notification does not contain userInfo dictionary. Look at code which fires this notification.