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We re almost there. On newer models of Robosapien, its left claw is wrapped in clear plastic (Figure 4-19). Go ahead and remove this plastic. This plastic wasn t present on earlier models, and I don t really see a reason for it. Figure 4-19. A protective plastic sleeve is found on newer models of Robosapien s left claw.

Figure 4-10. Binding the Text Field to the letters Property of ScrapWordsController This binding is complete. Any change to the controller s letters property (i.e. [controller setLetters:@"hello"], or controller.letters = @"hello") will be immediately reflected in the text field view. Editing the text field will update the value of letters in the controller. If that seems like a lot of magic for so little code, I ll lift the curtain a little and give you a peek at some of what s going on behind the scene. The key thing to keep in mind is that Interface Builder isn t doing anything special. The technologies that allow bindings to work Key-Value Coding, Key-Value Observing, and controllers are available to you directly. They can be used individually, or in concert, to implement a wide spectrum of solutions, beyond just making MVC designs easy.

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Key-Value Coding (KVC) allows an object s properties to be accessed interpretatively. It uses a combination of informal protocols (explained in 5) and introspection. As an example, assume there s a Key-Value Coding compliant Person class that has three properties: a string name property, and father and mother properties that reference two other Person objects. A person s name could be examined using the Key-Value path @"name". Their father s name could be addressed with the path @"father.name", and their maternal grandfather s name could be accessed using the path @"mother.father.name". KVC is discussed in more detail in the Introspection chapter.

You are finally done! Clean up your mess and put the box back together, if you want. Make sure you save the little plastic anchors that kept the wires holding the robot from breaking through the cardboard (Figure 4-20). We ll use these in a project later on. Figure 4-20. We ll use these later to enhance Robosapien s gripping capabilities.

Figure 8-9. Now the motors need to stop. Next, you want the bot to pause for a short period just in case it s swinging on the string. Drop in a WAIT block for this and configure it for three seconds (see Figure 8-10).

#import <ExceptionHandling/NSExceptionHandler.h> @implementation MyApplicationDelegate - (void)applicationWillFinishLaunching:(NSNotification*)notification { // Log all uncaught exceptions, but not low-level exceptions [[NSExceptionHandler defaultExceptionHandler] setExceptionHandlingMask: NSLogUncaughtExceptionMask |NSLogUncaughtSystemExceptionMask |NSLogUncaughtRuntimeErrorMask |NSLogTopLevelExceptionMask /*|NSLogOtherExceptionMask*/ ]; } @end

The exception syntax in Objective-C is relatively recent. Before it was added, the Objective-C language had no direct support for exceptions. Instead, exception handling was provided by a set of classes and some clever preprocessor macros. Listing 14-6 shows what legacy exception handling looked like.

OK, now that we have finally extricated Robosapien from its packaging, it s time to load the robot up with batteries and make sure it operates correctly. As with most battery-operated machines, Robosapien works best when its batteries are fresh. As the batteries lose their charge, Robosapien will have difficulty performing tasks and may even appear to be broken.

NS_DURING NSLog(@"%s trying",__func__); [self thrower]; NS_HANDLER NSLog(@"caught NSException: %@",localException); [localException raise]; NS_ENDHANDLER The legacy NS_DURING, NS_HANDLER, and NS_ENDHANDLER preprocessor macros expanded to C code that used the C longjmp( ) functions to create the necessary execution flow control. There was only one handler block, which caught all exceptions. The variable localException contained the caught exception. There was no finally block. Exceptions were thrown by sending the -raise messages to an NSException object. Table 14-3 shows the legacy exception syntax and its modern equivalent. Table 14-3. Legacy and Modern Exception Syntax

Figure 8-10. The WAIT block allows the bot to stop swinging. Now that the bot is stopped, you need to configure the program to start the bot moving again, but this time at a slower speed. This is done just as before, with a LOOP block configured to break when the Sound Sensor is triggered with the Sound level set to greater than 90 (>90).

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