c# create barcode 3: EA Framework Design Patterns in Objective-C

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CHAPTER 3: EA Framework Design Patterns
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The first part of the statement returns the default NSNotificationCenter, which, much like the UIApplication or sharedAccessoryController, is a singleton object, i.e., there is only one of them and it s not something to subclass. The rest of the line of code adds this object (self) as the observer. This means the notification center knows that to send certain notifications to this object. The selector statement defines the method within this object that gets called when we get the notification. The notification to which this refers is set by the name parameter, kCardSwiped. The object parameter sets the sender of the notification. By entering in nil for this value, you process any kCardSwiped notifications regardless of where they come from. To see how the data is sent from the card reader s controller, note the following code segment:
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NSMutableDictionary *dict = [[ NSMutableDictionary alloc] init]; [ [ [ [ dict dict dict dict setObject:num forKey:@"cardNumber"]; setObject:name forKey:@"cardName"]; setObject:year forKey:@"cardExpYear"]; setObject:month forKey:@"cardExpMonth"];
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[[NSNotificationCenter defaultCenter] postNotificationName:kCardSwiped object:self userInfo:dict]; [dict release];
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When the card reader controller object receives the card data (number, name, expiration month, and expiration year, for example) from the reader over the 30-pin connector (remember that this would work the same if the accessory was connected by Bluetooth), convert the raw data into objects, prior to this code. First create a dictionary object into which you can insert key-value pairs. Key-value pairing combines a name with a value. Think of an actual dictionary where the word you are looking up would be the key and the value would be the set of definitions. You can easily find the word because the dictionary is indexed alphabetically. Similarly, when using NSDictionary (or NSMutableDictionary) objects, the Key is the quick index to get to the value. One other thing to note is that you use NSMutableDictionary. This allows you to create the object first, then change it as you add the individual pieces of data. The next four lines of code add each of the four pieces of information to the dictionary object. The values num, name, year, month are added using the respective keys cardNumber, cardName, cardExpYear, and cardExpMonth. After this setup, all you need to do is post the notification as can be seen in the statement:
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[[NSNotificationCenter defaultCenter] postNotificationName:kCardSwiped object:self userInfo:dict];
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You retrieve the default notification center as before; tell it the object that is sending the notification, self; and add the dictionary (dict) you created as the supplemental
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CHAPTER 3: EA Framework Design Patterns
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userInfo parameter. In keeping with good memory management practices, because you created this object (the dict) using alloc and init, you release it to free memory space. You ve now addressed two out of the three steps for using notifications: registering an object to receive notifications and posting a notification containing userInfo. For the final piece of the pie, your receiver object, after being notified, needs to act on the notification and, in this case, get the userInfo dictionary that was sent with the notification. In an earlier code segment, you saw that, when your object received the notification, the cardRead method was selected. NOTE: Most statements in Cocoa that need to reference a particular method, use the selector field. As with the term protocol, selectors also have two meanings in Cocoa. First, a selector can be the name of a method when it is referred to in source code. Second, selector refers to the unique identifier that replaces the method name when the source code is compiled. Using @selector( ) in a statement refers to the compiled selector that represents the method at runtime. To pull the credit card information from the dictionary, use the following four statements one for each data object. The first portion of each statement accesses the userInfo field of the notification. Then, using simple Key-Value retrieval, pull out each of the data objects for use in completing the credit card transaction.
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NSData *num = [[notification userInfo] objectForKey:@"cardNumber"]; NSData *name = [[notification objectForKey:@"cardName"]; NSData *year = [[notification objectForKey:@"cardExpYear"]; NSData *month = [[notification objectForKey:@"cardExpMonth"]; userInfo] userInfo] userInfo]
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