NSNotificationcenter 사용

Use NSNotification

출처 : http://stackoverflow.com/questions/2191594/how-to-send-and-receive-message-through-nsnotificationcenter-in-objective-c 

 @implementation TestClass

- (void) dealloc

{

    // If you don't remove yourself as an observer, the Notification Center

    // will continue to try and send notification objects to the deallocated

    // object.

    [[NSNotificationCenter defaultCenter] removeObserver:self];

    [super dealloc];

}


- (id) init

{

    self = [super init];

    if (!self) return nil;


    // Add this instance of TestClass as an observer of the TestNotification.

    // We tell the notification center to inform us of "TestNotification"

    // notifications using the receiveTestNotification: selector. By

    // specifying object:nil, we tell the notification center that we are not

    // interested in who posted the notification. If you provided an actual

    // object rather than nil, the notification center will only notify you

    // when the notification was posted by that particular object.


    [[NSNotificationCenter defaultCenter] addObserver:self

        selector:@selector(receiveTestNotification:) 

        name:@"TestNotification"

        object:nil];


    return self;

}


- (void) receiveTestNotification:(NSNotification *) notification

{

    // [notification name] should always be @"TestNotification"

    // unless you use this method for observation of other notifications

    // as well.


    if ([[notification name] isEqualToString:@"TestNotification"])

        NSLog (@"Successfully received the test notification!");

}


@end


... somewhere else in another class ...


- (void) someMethod

{


    // All instances of TestClass will be notified

    [[NSNotificationCenter defaultCenter] 

        postNotificationName:@"TestNotification" 

        object:self];


}