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The methods implemented by a delegate are typically defined as informal protocols in the Cocoa framework. (See 5 if you need a refresher on informal and formal protocols.) Delegate object properties are of type id, allowing them to be set to any object. The methods the delegate object is expected to implement are defined in the documentation. You re free to do the same in your design, or you can adopt a more formal approach, as shown in Listing 17-2. You can t do this in Java, because Java has no concept of optional interface methods. If you re curious, the code to implement an informal protocol in Java by testing for the presence of a method was demonstrated in 10.

@interface Gun : NSObject @end @protocol Targeting @required - (BOOL)gun:(Gun*)gun shouldShootAt:(id)target; @optional - (NSArray*)gun:(Gun*)gun prioritizeTargets:(NSArray*)targets; - (BOOL)gunShouldStopFiring:(Gun*)gun; @end @interface AutomaticPerimeterDefenseGun : Gun { id<Targeting> delegate; }

So while you might have some trepidation about taking apart your $100 toy, fear not. The Robosapien is absolutely designed to be taken apart, modified, and hacked. A great example of this came in one of my discussions with Mark Tilden while I was doing research for this book. He was showing me a slide show presentation about the development of Robosapien, much of which ended up becoming 3 of this book. All of a sudden, a large group of kids playing with Robosapien pops up on the screen. The next slide showed a bunch of nerdy guys in white laboratory jackets; how you might imagine a group of research scientists would look like. Mark explained each slide as follows:

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@property (assign) id<Targeting> delegate; - (void)engage; - (void)disengage; - (float)ammunitionRemaining; - (void)reload; @end @interface AutomaticPerimeterDefenseGun () // private methods - (void)defendPerimeter; - (NSArray*)acquireTargets; - (NSArray*)targetsFromSensor; - (void)fireAtTarget:(id)target; @end @implementation AutomaticPerimeterDefenseGun @synthesize delegate; - (void)defendPerimeter { // Check with the delegate to see if the gun should stop if ([(id)delegate respondsToSelector:@selector(gunShouldStopFiring:)]) { if ([delegate gunShouldStopFiring:self]) { [self disengage]; return; } } // Gather the potential targets NSArray *targets = [self aquireTargets]; // Fire at the ones the delegate identifies as enemies for ( id target in targets ) { if ([delegate gun:self shouldShootAt:target]) { [self fireAtTarget:target]; } } }

Figure 17-2. Grace s sketch of the burial chamber Evan looked over the drawing. The sarcophagus was the largest item in the room, but it was the small objects that caught Evan s eye. He was certain there had to be at least one more challenge. What are these circles he asked. Inside the chamber are four small statuettes. Each one is a carved wooden figure, said Grace. This first one is U laka. He was King Ixtua s bravest warrior. The next one is Raxu, considered to be the king s wisest friend. And this one is Ba rii, Ixtua s most loyal military leader. Each figurine has a different Mayan glyph carved on it Bravery, Wisdom, and Honor. What about this one, asked Max, pointing to a fourth circle on the drawing. That s a small figurine of King Ixtua, replied Grace. And the water flows under this ramp here asked Uncle Phillip. Yes. And the scroll says that if the trap in this room is triggered, the room will flood. And that s the bad part, Grace added. The floor around the pedestal is one large pressure plate. So, there is one more challenge, said Uncle Phillip. Oh, yeah, said Grace. And it s an interesting one.

- (NSArray*)acquireTargets { NSArray *targets = [self targetsFromSensor]; // Pass the targets through the delegate for prioritization, filtering, ... if ([(id)delegate respondsToSelector:@selector(gun:prioritizeTargets:)]) targets = [delegate gun:self prioritizeTargets:targets]; return targets; } - (NSArray*)targetsFromSensor { } - (void)fireAtTarget:(id)target { } @end The code implements an automatic perimeter defense gun for our mythical adventure game that, once engaged, acquires and shoots at targets autonomously. It defers several targeting and gun control decisions to a delegate object. The single most important is the identification of which targets it should shoot at. The delegate property is formally declared to be an object that adopts the Targeting protocol. Using the Objective-C 2.0 @required and @optional directives, the delegate s requirements are spelled out to the compiler. The delegate must implement the -gun:shouldShootAt: message, and may implement -gun:prioritizeTargets: or -gunShouldStopFiring:. If you don t generate documentation for your classes, this is an effective way of communicating the delegate requirements to the compiler and other programmers.

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