Как отправить уведомление с помощью NSNotificationCenter в Objective-C?

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NSNotification *notification = [NSNotification notificationWithName:@"myNotification" object:nil];

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[[NSNotificationCenter defaultCenter] postNotification:notification];

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

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- (void)myNotificationHandler:(NSNotification *)notification {
    // Ваша обработка уведомления
}

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- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}