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Using the method requires creating a class instance first Although not required, you should also initialize the class Remember, all classes extend NSObject, which has an init method, so every Objective-C class is guaranteed to implement init

If the delegate can respond to that message, the browser will send the message. Otherwise, the browser ignores that delegate for now and just goes on its merry way.

Simple *objSimple = [[Simple alloc] init]; [objSimple sayHello:@"James"];

Enterprise Value Multiples Date 7/31/01 10/1/99 2/18/99 1/7/99 6/16/95 Target Fargo Elect Multigraphics PTI Inc Trident Int l Imtran Ind Acquirer Zebra Tech Paragon Group MacDermind Illinois Tool Foilmark Inc High Median Mean Low

Selectors can be passed around and used as arguments to methods and even stored as instance variables. This can lead to some very powerful and flexible constructs.

+ (void) sayGoodBye;

A class method doesn t require creating a class instance before using the method For instance, when first allocating space for an object instance, you call a class alloc method If the class doesn t implement the alloc method, the runtime traverses up the class inheritance hierarchy until it finds an alloc method or it reaches NSObject s alloc method and calls it

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One of the classes in the AppKit is called NSTimer; it can send a message to an object repeatedly, which is very handy in games when you want to move a monster toward the player on a regular basis. When you make a new NSTimer, you give it the object you want it to send a message to and a selector saying which method you want it to call. For example, you could have a timer call the moveMonsterTowardPlayer: method of your game engine. Or, you could have another timer call an animateOneFrame: method.

prepared by management or others, such as equity research analysts The projections of EBITDA or free cash flow are then discounted to their present value Most commonly, five-year projections are used, but they may be longer or shorter Terminal values are then calculated by applying multiples of EBITDA in the final projected year Ranges of 40 to 80 times are common The cash flow streams and terminal values are then discounted to present values using ranges of appropriate discount rates, usually 10 to 20 percent For example, Table 123 presents a terminal value s net present value where the EBITDA cash flow stream is projected to be $1 million in five years The EBITDA is multiplied here by a number ranging from 60 to 100 to determine the terminal value The terminal value is then discounted back to the present at discount rates ranging from 15 to 20 percent The resulting number is the net present value of the terminal value

Simple *mySimple = [Simple alloc]; [mySimple init];

Summary

The alloc method is a class method example You don t instantiate a class instance before calling alloc; rather, you call alloc directly using the class You create and use class methods just like Java static methods And Objective-C class methods have the same restrictions as Java static methods You can t reference that class instance variables from a static method, as the

We introduced you to categories in this chapter. Categories provide a way to add new methods to existing classes, even if you don t have the source code for those classes. In addition to adding functionality to existing classes, categories provide a way to split an object s implementation across multiple source files or even across multiple frameworks. For example, think back to NSString s data-handling methods, which are implemented in the Foundation framework, separate from its drawing methods from the AppKit. Categories let you declare informal protocols. An informal protocol is a category on NSObject that lists methods that objects might be able to respond to. Informal protocols are used to implement delegation, a technique that allows you to easily customize the behavior of an object. Along the way, you also learned about selectors, which are a way to indicate a particular Objective-C message in your code. Coming up next are Objective-C protocols, the formal protocols that are the dressed-up cousins of informal protocols.

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