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Each object has its own draw() function that knows how to draw its specific shape. For example, a Circle object s draw() knows to draw a circle. A Rectangle s draw() knows to draw four straight lines that form a rectangle. The Shapes-Object program (available at 03.10 - Shapes-Object) does the same stuff as Shapes-Procedural but uses Objective-C s object-oriented features to do it. Here s drawShapes() from Shapes-Object:

Table rows might also contain a picture and other customizations, as the YouTube and App Store applications illustrate (Figure 10-5) As the applications in the first five figures illustrate, the table view is a powerful control for listing items You can modify rows, add images, select rows, and edit them In this chapter,

void drawShapes (id shapes[], int count) { int i; for (i = 0; i < count; i++) { id shape = shapes[i]; [shape draw]; } } // drawShapes;

Figure 10-5

125,000) (75,000) 50,000) 100,000) 620,000)

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This function contains a loop that looks at each shape in the array. In the loop, the program tells the shape to draw itself. Notice the differences between this version of drawShapes() and the original. For one thing, this one is a lot shorter! The code doesn t have to ask each individual shape what kind it is. Another change is shapes[], the first argument to the function: it s now an array of id objects. What is an id Is it a psychological term referring to the part of the mind in which innate instinctive impulses and primary processes are manifest Not in this case: it stands for identifier, and it s pronounced eye dee. An id is a generic type that s used to refer to any kind of object. Recall that an object is just a C struct with some code attached, so an id is actually a pointer to one of these structures; in this case, the structures make various kinds of shapes. The third change to drawShapes() is the body of the loop:

Q: A:

What s a CFURLRef What s an NSURL A CFURLRef is a reference to a CFURL object A CFURL is part of the Core Foundation framework, meaning it is C, not Objective-C, and provides functions to create and parse URLs An NSURL is a higher-level, Cocoa Objective-C class for working with URLs It encapsulates a URL and provides many functions for manipulating URLs Refer to the NSURL Class Reference for more information You can cast an NSURL * as a CFURLRef because of Apple s toll-free bridging functionality The term toll-free bridging refers to certain Core Foundation types being interchangeable with their higher-level Cocoa counterparts Just remember, a pointer to an NSURL is equivalent to a CFURL reference

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id shape = shapes[i]; [shape draw];

You can use the AudioServicesPlaySystemSound to vibrate a user s iPhone Pass the kSystemSoundID_Vibrate identifier constant to the function All versions of the iPhone can vibrate, but only the latest 4th-generation iPod touch is capable of vibrating; this code does not do anything on an earlier iPod touch

The first line looks like ordinary C. The code gets the id that is, a pointer to an object from the shapes array and sticks it into the variable named shape, which has the type id. This is just a pointer assignment: it doesn t actually copy the entire contents of the shape. Take a look at Figure 3-2 to see the various shapes available in Shapes-Object. shapes[0] is a pointer to the red circle; shapes[1] is a pointer to a green rectangle; and shapes[2] is a pointer to a blue egg.

The AVAudioPlayer plays sounds The audio player does not have the limitations of the AudioServicesPlaySystemSound function It can play any length sound, loop a sound, and play multiple sounds at the same time; it also allows control over a sound s volume Methods you might use include prepareToPlay, play, pause, and stop Each method s functionality should be intuitive Notice that prepareToPlay and play return a BOOL, so you can evaluate if the call was successful

[1] Per Equation [9] in the article, Forecasting Cash Flow: Mathematics of the Payout Ratio, Jay B Abrams, Retention Ratio [ (Cap Expenditures Depr) Increase in NWC] / NI

0, 0, 10, 30 Red (Circle)

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