Building iPhone OS Accessories: Use the iPhone Accessories by Ken Maskrey

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By Ken Maskrey

This booklet presents a significant, in-depth examine Apple’s exterior accent framework and the iPhone components API. You’ll create new, built-in options that mix iPhone apps with devoted undefined. The iPhone OS components API expands the possibilities for leading edge iPhone builders, permitting you to regulate and computer screen exterior units, even if you’ve outfitted them your self or acquired them from a 3rd get together. What you’ll study strengthen add-ons and apps for the iPhone and iPod contact. Use Apple’s exterior accent framework to create hardware/software interplay. keep watch over and visual display unit exterior units utilizing the iPhone components API. Use the explicit controller sessions in the iPhone OS software program improvement package. construct and keep watch over your individual accent. Get your add-ons authorized by means of Apple’s AE application. Who this e-book is forThis publication is for iPhone and iPod contact builders who are looking to write apps to regulate exterior add-ons and builders who are looking to create components for iPhone and iPod contact. This comprises embedded structures programmers who've been omitted of the iPhone gold rush before. The iPhone OS add-ons API expands the marketplace of iPhone builders all over again, and this booklet is for all these builders desirous to use those new APIs to manage and computer screen exterior device—whether self-built or obtained from different resources. desk of Contents accent evaluate  EAAccessory Framework   EA Framework layout Patterns   the sport Controller   Specifying a Pong Game   Coding a Pong Game   including the sport Controller  bettering the layout  Apple Developer Programs   layout  Firmware  every thing Else 

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Additional protocols can be added by using separating commas within the single set of brackets. For example, see the following code: @interface OurAppDelegate : NSObject { UIWindow *window; CHAPTER 2: EAAccessory Framework UINavigationController *navigationController; } To define your own protocol, you might use the following: @protocol OurProtocol - (BOOL)send:(id)data; - (id)receive; @optional - (int)status; @end This protocol would require send: and status to be implemented, leaving receive as an option whether to include or to leave out.

In actuality, you need to be able to turn the LED on or off. You could have a command for each or you could have a single command with a parameter to say whether you want the LED to turn on or off. Similarly, if you had multiple LEDs on the accessory, you might have an additional information field that tells you which LED to command. So your LED command would contain three fields. First, the LED command itself, then the LED to operate upon, and, finally, whether you are turning it on or off. Figure 2–4 depicts the case where you have three LEDs in your accessory.

In iPhone OS, you use NSLog to output test messages to the console much as printf is used in standard Unix C programming. Protocols Before digging into the details of the EA framework, one thing you must come to grips with is the concept of protocols. Now, as an experienced iPhone programmer, you’re probably thinking that you already understand protocols. Protocols establish a set of required and/or optional protocols that an object must implement. And that is correct. The problem is that the EA framework uses another definition of protocol.

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