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1 Create a new View-based Application Name the project SimpleMultiArg 2 Create a new NSObject subclass called Simple Xcode generates the Simpleh and
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Simplem files
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3 Open Simpleh and add a method declaration for startPlay (Listing 4-7)
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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
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Listing 4-10 Listing 4-7 Simple s interface
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#import <Foundation/Foundationh> @interface Simple : NSObject { } -(void) startPlay: (NSString*) title audienceMembers: (int) value supportingActor: (NSString*) actorvalue extrasNeeded: (int) extrasvalue; @end
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Listing 4-8
Simple s implementation
#import "Simpleh" @implementation Simple -(void) startPlay: (NSString*) title audienceMembers: (int) value supportingActor: (NSString*) actorvalue extrasNeeded: (int) extrasvalue { NSLog(@"The title: %@", title); NSLog(@"Audience: %d", value); NSLog(@"Supporting actor: %@", actorvalue); NSLog(@"Extras needed: %d", extrasvalue); } @end
Listing 4-9
The mainm file modified to call Simple s startPlay method
#import <UIKit/UIKith> #import "Simpleh" int main(int argc, char *argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; Simple * objSimple = [[[Simple alloc] init] autorelease]; [objSimple startPlay:@"Peter Pan" audienceMembers:500 supportingActor:@"John Doe" extrasNeeded:55]; int retVal = UIApplicationMain(argc, argv, nil, nil); [pool release]; return retVal; }
4:
Just Enough Objective-C: Part Two
Listing 4-10
Debugger console output from running program
[Session started at 2010-12-29 18:49:55 -0500] 2010-12-29 18:49:57242 SimpleMultiArg[3132:20b] The title: Peter Pan 2010-12-29 18:49:57243 SimpleMultiArg[3132:20b] Audience: 500 2010-12-29 18:49:57244 SimpleMultiArg[3132:20b] Supporting actor: John Doe 2010-12-29 18:49:57245 SimpleMultiArg[3132:20b] Extras needed: 55
NOTE
Here, startPlay is not the method s true name In Objective-C, if a method has more than one parameter, the method s parameters (other than the first parameter) are part of the method s name By this book s end, you should be familiar with this naming convention, as many of the methods you use will have multiple parameters For instance, the startPlay method s name is actually the following: startPlay:audienceMemebers:supportingActor:extrasNeeded:
Understanding the id Variable Type, Dynamic Typing, and Dynamic Binding
Objective-C is a dynamically typed language Like Java, Objective-C permits object types to be determined dynamically at runtime rather than statically at compile time Objective-C accomplishes this dynamic typing using the id data type
The id Type
The id variable is a data type that represents an object s address Because it s just an address, id can be any object, and because its type is a pointer, you don t need to include the * symbol, as the * symbol signifies a pointer to a specific type For instance,
Foo * myFoo;
is a pointer to a Foo object The compiler knows the pointer points to an address that contains an object of type Foo However, the following,
id myFoo;
provides no such information to the compiler The compiler only knows that myFoo is a pointer the compiler knows where the pointer is pointing, but it doesn t know the data
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type of what myFoo points to Only at runtime can it be determined what myFoo actually points to
Dynamic Binding and Dynamic Typing
Objective-C accomplishes dynamic behavior using what s called dynamic typing and dynamic binding Dynamic typing means that an object s type is not determined until runtime For instance, a method that takes an id or an instance variable of type id has no way of knowing the object s type until the object is actually sent to the method or assigned to the instance variable Dynamic binding means that the method to invoke is not determined until runtime And, unlike Java, Objective-C often doesn t require casting an object to its specific data type before being used
Understanding Inheritance
You have already seen how Objective-C classes inherit from parent classes In the interface, you specify that a class inherits from another class by placing the parent s name after the class s name and a colon
@interface SimpleChild : Simple
Like any object-oriented language, Objective-C sets up classes to extend ancestors further up its hierarchy, with new methods and instance variables Objective-C child classes can also redefine an ancestor s method But, like Java (and unlike C++), Objective-C allows a class to inherit from only one parent; Objective-C doesn t support multiple inheritance
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