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variable (say, cell) and a parameter variable with the same name create some ambiguity. Like Java, the symbol name by itself will always refer to the parameter or local variable. The cell instance variable must then be addressed indirectly using self->cell (this.cell). Unlike Java, the Objective-C compiler will complain with a warning that the local declaration of cell hides instance variable. To avoid the warning, and any possible ambiguity, most Objective-C programmers choose parameter names that don t conflict with any instance variables, electing to use names like aCell or newCell instead of just cell.

(Photo courtesy of Mark Tilden, WowWee Ltd.)

Naming methods in Objective-C is a bit of an art. Objective-C method names are generally constructed using one of the forms shown in Listing 3-5. The listing shows some abstract method names followed by several real-world examples.

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Even though we re not in the same room, I ll know if you re snickering. I told you before that I m not an artist, so keep that in mind when you begin to look at my sketches of the StringBot. Luckily, I know a little bit about what I m looking for in terms of the shape and size of the StringBot. One of my constraints mentioned keeping the StringBot symmetrical. I know that if the bot isn t symmetric, it will lean to one side . . . and if it comes off the string, that will be bad, right In my Mindstorm box, I indicated that I want to use two motors, one on the left and one on the right. If I do this, I ll have to place that third motor near the middle of the bot to keep it from leaning. Since I m going to use the idea of a cable car, I want the pulley wheels to be on top. And since I know my StringBot won t work without the Intelligent Brick, I ve got to decide whether to have the Brick mounted horizontally, with the buttons parallel to the ground, or mounted vertically, so I can view the LCD screen as the bot moves away from me.

Simple actions: -action; -draw; -play; -becomeKeyWindow;

(Photo courtesy of Mark Tilden, WowWee Ltd.)

Action methods with a parameter: -actionParameter:param; -drawCell:cell; -sendEvent:event; Actions with multiple parameters: -actionParameter:firstParam secondParameter:secondParam; -replaceSubview:oldView with:newView; -postNotificationName:name object:sender; Methods returning a value: -value; -key; -window; -stringByExpandingTildeInPath; Methods with parameters that return a value: -valuePrepositionParameter:parameter; -objectForKey:key; -stringByAppendingString:string; -numberFromString:string; Reading and inventing your own names isn t too difficult if you keep the following in mind. The general form for a method name begins with a description of the returned value (if any), followed by the action the method performs, followed by a description of the first parameter (if any). A method named -menuForEvent: can be reasonably assumed to take an NSEvent object as a parameter and return an NSMenu object. Subsequent keywords describe that parameter and often include a preposition such as in, to, or with. The parameter s description is sometimes implied, as in -replaceSubview:oldView with:newView. Avoid including superfluous verbs like do or does. Objective-C does not the support overloading of method names that differ only in their parameter types the way Java does. But it really isn t necessary. If two Objective-C methods differ only in their parameters, the methods will have different names: -drawRect:rect, -drawCell:cell, -drawPage:page instead of the equivalent overloaded Java functions draw( Rect rect ), draw( Cell cell ), draw( Page page ). There are no hard and fast rules for naming methods. The principal goal is readability. Objective-C method names lend a refreshing verboseness to code that makes it much more selfexplanatory. Listing 3-6 shows two code fragments that extract the substring Walrus into a character array.

Java char c[] = new char[20]; String s = "The time has come, the Walrus said ..."; s.getChars(23,29,c,1); Objective-C unichar c[20]; NSString *s = @"The time has come, the Walrus said ..."; [s getCharacters:&c[1] range:NSMakeRange(23,6)];

Figure 3-5. This photo shows an early version of the head. Of particular note is the breadboard on the right with the early brains.

Okay, so it s time to draw. I tend to draw using basic shapes like rectangles, squares, and circles, so my sketches will consist of components drawn using their most basic shapes (the motor, for example, is two circles connected by a small rectangle). Figure 6-8 shows my initial sketches for the StringBot no laughing!

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