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Additional info for Building iPhone OS Accessories: Use the iPhone Accessories API to Control and Monitor Devices

Example text

A delegate is nothing more than one of those objects within the set of objects that make up your program, or, specifically, your application. You might have view-controller objects, tab-bar controller objects, and even special, unique objects that you’ve made up. Because we tend, as developers, to get caught up in the details, it is easy to forget that your set of objects is also an object in itself. Together they form a UIApplication object. Now, it’s easy to see that this higher-level object, the UIApplication, also contains properties and methods.

ModelNumber NSString The model number of the connected accessory. name NSString The, usually decorative, name of the device attached to the iPhone. protocolStrings NSArray An array of protocol names used by the accessory. serialNumber NSString A number that uniquely identifies the specific unit. May or may not be available depending on manufacturer 37 38 CHAPTER 2: EAAccessory Framework EAAccessory Class Constants The EAAccessory class also provides the constant EAConnectionIDNone; a constant to be used when identifying an unconnected accessory.

Property (nonatomic, readonly) NSString *protocolString This property returns the NSString containing the protocol associated with the session. When you create a session, you set the protocolString value as shown in the following statement: EASession *session = [[EASession alloc] initWithAccessory:accessory forProtocol:protocolString]; Here, you create a reference to an EASession object called session using the standard alloc-init methods. Remember, when using alloc-init, you must release the object somewhere else in the code.

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