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for these two calls, valueForKey: looks for -name and -make. If there is no getter method, it looks inside the object for an instance variable named _key or key. If we had not supplied accessor methods via @synthesize, valueForKey would look for the instance variables _name and name or _make and make. That last bit is huge: -valueForKey uses the metadata in the Objective-C runtime to crack open objects and poke inside them looking for interesting information. You can t really do this kind of stuff in C or C++. By using KVC, you can get values where there are no getter methods and without having to access an instance variable directly via an object pointer. The same technique works for the model year:

The first argument is unnamed The second and any further arguments are distinguished by a space followed by an argument name and colon, followed by the type in parentheses, followed by a parameter name to hold the value Now, here s the tricky part: When referring to a multiple-argument method, when calling the method, you refer to its named arguments An argument s named argument is the name prior to the argument s data type When using the argument within the method s implementation that the argument is a part of, you refer to the actual parameter name, not the argument name So, for instance, in the startPlay method s implementation, you refer to title, value, pievalue, actorvalue, and extrasvalue When calling the method, you refer to startPlay s named arguments: audienceMembers, pie, supportingActor, and extrasNeeded

NSLog (@"model year is %@", [car valueForKey: @"modelYear"]);

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you incur as a result of the election that would not have been incurred by you in a straight stock sale

1 Create a new View-based Application Name the project SimpleMultiArg 2 Create a new NSObject subclass called Simple Xcode generates the Simpleh and

which would print out model year is 1984. Hey, wait a minute! %@ in NSLog prints out an object, but modelYear is an int, not an object. What s the deal For KVC, Cocoa automatically boxes and unboxes scalar values. That is, it automatically puts scalar values (ints, floats, and some structs) into NSNumbers or NSValues when you use valueForKey, and it automatically takes scalar values out of these objects when you use -setValueForKey. Only KVC does this autoboxing. Regular method calls and property syntax don t do this.

3 Open Simpleh and add a method declaration for startPlay (Listing 4-7)

Under certain circumstances the seller can use the installment method of reporting gain to defer recognition of taxable gain on a sale of assets or stock if the seller takes back a note for all or a portion of the sales price Under the installment method, the seller determines what portion of total sales proceeds represent taxable gain, which is the percentage of each payment received from the buyer that is taxable at the time the payment is made If available, the installment method can be used to enhance a seller s investment yield from a sale This is because the seller would not be taxed on the gain from sale of the stock until the principal amount of the note is paid and would receive interest payments with respect to the amount of tax that would have been paid in an all-cash transaction

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In addition to retrieving values, you can set values by name by using -setValue:forKey:

4 Open Simplem and add the method s implementation (Listing 4-8) 5 Modify mainm to use Simple so that it appears like Listing 4-9 6 Build and run the application The Debugger Console should echo the same logging as

[car setValue: @"Harold" forKey: @"name"];

#import <Foundation/Foundationh> @interface Simple : NSObject { } -(void) startPlay: (NSString*) title audienceMembers: (int) value supportingActor: (NSString*) actorvalue extrasNeeded: (int) extrasvalue; @end

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