access object passed in NSNotification?

user_34548 0
Viewed 21377

I have a NSNotification that is posting a NSDictionary:

 NSDictionary* dict = [NSDictionary dictionaryWithObjectsAndKeys:
                                          anItemID, @"ItemID",
                                          [NSString stringWithFormat:@"%i",q], @"Quantity",
                                          [NSString stringWithFormat:@"%@",[NSDate date]], @"BackOrderDate",
                                          [NSString stringWithFormat:@"%@", [NSDate date]],@"ModifiedOn",
                                          nil];

                    [[NSNotificationCenter defaultCenter] postNotification:[NSNotification notificationWithName:@"InventoryUpdate" object:dict]];

How do I subscribe to this and get information from this NSDictionary?

in my viewDidLoad I have:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(recieveInventoryUpdate:) name:@"InventoryUpdate" object:nil];

and a method in the class:

- (void)recieveInventoryUpdate:(NSNotification *)notification {
    NSLog(@"%@ updated", [notification userInfo]);
}

which logs a null value of course.

nsnotifications objective-c ios
8 Answers

More simpler way is

-(void)recieveInventoryUpdate:(NSNotification *)notification
{
    NSLog(@"%@ updated",[notification object]);
    //Or use notification.object
}

It worked for me.

user_59671440

Simple Answer

Detail Answer

full code should be:

definition

  • observer in your viewDidLoad
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(recieveInventoryUpdate:) name:@"InventoryUpdate" object:nil];
  • and handle notification method
- (void)recieveInventoryUpdate:(NSNotification *)notification {
    NSLog(@"notification=%@", notification);
    // NSDictionary* yourPassedInDict = notification.userInfo;
    NSDictionary* yourPassedInDict = [notification userInfo];
    NSLog(@"dict=%@", yourPassedInDict);
}

usage = caller

  • posting a NSDictionary
NSDictionary* dict = [NSDictionary dictionaryWithObjectsAndKeys:
    anItemID, @"ItemID",
    [NSString stringWithFormat:@"%i",q], @"Quantity",
    [NSString stringWithFormat:@"%@",[NSDate date]], @"BackOrderDate",
    [NSString stringWithFormat:@"%@", [NSDate date]],@"ModifiedOn",
    nil];

[[NSNotificationCenter defaultCenter] postNotification:[NSNotification notificationWithName:@"InventoryUpdate" object:self userInfo:dict]];
user_16162630
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