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You may also want to define your own notification centers. 15 showed code for creating a per-thread notification center. Since notifications are always delivered in the thread that posted them, a per-thread notification center would allow you to organize your observers by thread.

CHAPTER 15:

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Posting a synchronous notification is simple, deftly demonstrated by the Thermometer class in Listing 18-1. There are three pieces of information that make up a notification:

FIGURE 15-11

The notification name The sender A dictionary of supplementary information The notification name is a string object It can be any value you choose, as long as it doesn t conflict with the notification names used by other objects Generally, a descriptive title like @"TemperatureDidChange" is sufficient to be unique Notification name constants defined by frameworks tend to use class naming conventions For example, all of the Cocoa framework notification names begin with NS The object property of a notification contains a reference to the sender Thus, every notification includes an implicit reference to the object that sent it In the example in Listings 18-1 and 18-2, it wasn t strictly necessary to include the temperature value in the userInfo dictionary The notification receiver could have obtained the value with ((Thermometer*)[notification object])temperature The optional userInfo dictionary is an immutable dictionary containing whatever supplementary objects the provider wants to include.

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As mentioned, it wasn t strictly necessary to include the temperature value in the userInfo dictionary, but it s often a good idea Having the temperature included in the dictionary relieves the observer of having to make too many assumptions about the sender (such as, is the new temperature value still valid when the notification is received ) The userInfo dictionary is a great place to include other useful or transient information, such as the previous temperature value, the rate the temperature is changing, and so on Then again, in many notifications the only interesting bit of information is the sender The notification name and sender are required The userInfo dictionary is optional, or can be empty There are three methods for posting notifications: - (void)postNotificationName:(NSString*)name object:(id)sender - (void)postNotificationName:(NSString*)name object:(id)sender userInfo:(NSDictionary*)info - (void)postNotification:(NSNotification*)notification The first two messages construct a new NSNotification object from the name, sender, and optional dictionary.

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The last message accepts a pre-assembled NSNotification object and posts it Note that while the object parameter is required, there s no rule that says it must be the object sending the notification You re welcome to post notifications on behalf of other objects Notifications are delivered synchronously to all observers in the same thread before the -postNotification message returns It s possible to send notifications asynchronously using an NSNotificationQueue, described in the Notification Queuing section later in the chapter..

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The real power of notifications is in the flexible ways an observer can register to receive them. To register to receive notifications, send the NSNotificationCenter an -addObserver:selector:name:object: message. The four parameters define what notifications it will receive and how it will receive them: The observer and selector parameters define the object that will receive the notifications and the Objective-C message that will be sent to it. The method must be compatible with -(void)notificationMessage:(NSNotification*)notification. While the observer parameter is typically self, you are free to register other objects. The name parameter is the name of the desired notification. The object parameter is the desired provider.

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