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Figures 3-28 and 3-29. Things are really coming together in this prototype, with the brain structure and internal frame almost complete. However, literally days after it was built, the company that WowWee had been working with filed for bankruptcy.

The copy attribute is more appropriate with string and collection objects than it is in Java. In Objective-C, string and collection classes have mutable subclasses. So an NSString is not guaranteed to be immutable the way a Java String object is. Making a copy ensures that the property isn t affected by changes to the orginal object used to set the property.

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Figure 7-27. Connect the sound sensor to the Brick. Okay, the StringBot is almost finished. Are you beginning to see how it will work You ll feed a string through one of the middle holes on the front string guide. The string will then go under the first rim, then the rubber wheel, and then the second rim. Thread the string through the final string guide, and your StringBot will be able to move along the string. That covers movement on the string, but you still need to be able to drop small objects in the jar. That s accomplished with the carrier arm.

Properties are implemented by accessor methods that get and set a value in the receiver. Since they are implemented using methods, subclasses can override those methods, essentially overriding the property. Overriding a property s accessor methods can be done informally or formally. To do it informally, simply override the appropriate accessor method. To override the setter method implied by @property int tag, just implement a new -(void)setTag:(int)newTag method in your subclass. It doesn t even have to be declared in the subclass s @interface. To formally override a property, declare a duplicate @property directive in the subclass. The @property directive must be identical to the one in the superclass with one exception: a subclass can declare a property as readwrite when the superclass s property is readonly. This supports the design pattern of a mutable subclass of an immutable superclass. Once declared, the @synthesize directive can be used to reimplement the accessor methods for the subclass or you can implement them yourself.

Tip This is one practical application for the @dynamic directive. Since the superclass already implements the

The next stage in the development of Robosapien involved designing the outer shell, creating the unique personality, and beginning mass production of the toy.

accessor method for the property, the subclass can redeclare the property, use the @dynamic directive to ignore the requirement to reimplement both accessor methods, then override just the getter or setter method.

You re almost done. We re going to build a small carrier arm for the StringBot that will be used to carry a pebble or small coin to be dropped in the jar. The third motor will be used to control the carrier, and we ll place it on the bottom of the current StringBot assembly. Figure 7-28 shows the majority of the pieces you ll need for this section. Go ahead and grab them and let s start building.

The accessor methods for a property can be invoked like any other method. But formally declared properties carry an additional benefit. Objective-C 2.0 extends the member variable operator (.) to allow easy access to formally defined properties. This so-called dot syntax lets you interact with an object s property the way you would address a member variable in Java. Using the class defined in Listing 3-9, the code in Listing 3-10 sets and accesses several properties of a Person object. The dot syntax is expanded by the compiler to call the appropriate getter or setter method for each property; it does not directly access the object s instance variables as it would in Java. This is considered syntactic sugar, provided to improve readability and reduce clutter. The code produced by Listing 3-10 is identical to the code shown by Listing 3-11.

(Sketch by Anne Marie Arnold based on Mark Tilden s original drawing)

Person *person = ...; person.firstName = @"James"; if (person.lastName.length==0) person.lastName = @"Smith"; person.tag += 3;

Person *person = ...; [person setFirstName:@"James"]; if ([[person lastName] length]==0) [person setLastName:@"Smith"]; [person setTag:[person tag]+3];

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