zxing barcode scanner java Modify SimpleInheritanceViewControllerm so that it creates and initializes a new in Objective-C

Print Denso QR Bar Code in Objective-C Modify SimpleInheritanceViewControllerm so that it creates and initializes a new

8 Modify SimpleInheritanceViewControllerm so that it creates and initializes a new
Decoding QR Code In Objective-C
Using Barcode Control SDK for iPhone Control to generate, create, read, scan barcode image in iPhone applications.
Denso QR Bar Code Generation In Objective-C
Using Barcode printer for iPhone Control to generate, create QR Code JIS X 0510 image in iPhone applications.
Environment instance in the applicationDidFinishLaunching: method (Listing 6-10) Be certain to release myEnvironment in SimpleInheritanceView Controller s dealloc method
Scanning QR Code In Objective-C
Using Barcode recognizer for iPhone Control to read, scan read, scan image in iPhone applications.
Bar Code Printer In Objective-C
Using Barcode maker for iPhone Control to generate, create barcode image in iPhone applications.
9 Click Build And Debug to run the application You should see the debug statements in
Create QR Code ISO/IEC18004 In Visual C#
Using Barcode generator for .NET Control to generate, create QR Code image in .NET framework applications.
Create QR Code 2d Barcode In .NET Framework
Using Barcode drawer for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
Listing 6-11 print to the debugger console
QR Code Generator In .NET Framework
Using Barcode creator for VS .NET Control to generate, create QR-Code image in .NET applications.
Make QR Code JIS X 0510 In Visual Basic .NET
Using Barcode encoder for .NET Control to generate, create QR Code ISO/IEC18004 image in .NET framework applications.
(continued)
Generating Bar Code In Objective-C
Using Barcode printer for iPhone Control to generate, create barcode image in iPhone applications.
UPC Code Generator In Objective-C
Using Barcode generator for iPhone Control to generate, create UPC-A image in iPhone applications.
Objective-C for iPhone Developers: A Beginner s Guide
USS-128 Drawer In Objective-C
Using Barcode maker for iPhone Control to generate, create EAN / UCC - 14 image in iPhone applications.
USS Code 128 Printer In Objective-C
Using Barcode creation for iPhone Control to generate, create Code128 image in iPhone applications.
Listing 6-1
GTIN - 12 Creation In Objective-C
Using Barcode printer for iPhone Control to generate, create UPCE image in iPhone applications.
Barcode Generation In None
Using Barcode maker for Font Control to generate, create barcode image in Font applications.
Fruith
Encode Barcode In None
Using Barcode creator for Software Control to generate, create barcode image in Software applications.
Barcode Creation In Objective-C
Using Barcode printer for iPad Control to generate, create bar code image in iPad applications.
#import <Foundation/Foundationh> #define UNRIPE 0 #define RIPE 1 #define VERY_RIPE 2 #define ROTTEN 3 #define VERY_ROTTEN 4 #define PUTRID 5 @interface Fruit : NSObject { int state; } - (NSString *) getState; - (void) ripen; @end
UPC-A Supplement 2 Reader In .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
Bar Code Encoder In .NET Framework
Using Barcode generator for Reporting Service Control to generate, create barcode image in Reporting Service applications.
Listing 6-2
Make EAN / UCC - 13 In None
Using Barcode creator for Word Control to generate, create GS1 - 13 image in Office Word applications.
Generate Barcode In Java
Using Barcode creator for Java Control to generate, create bar code image in Java applications.
Fruitm
#import "Fruith" @implementation Fruit - (void) ripen { state++; } - (NSString *) getState { switch (state) { case 0: return @"unripe"; case 1: return @"ripe"; case 2: return @"very ripe"; case 3: return @"rotten"; case 4: return @"very rotten"; case 5: return @"putrid"; default: return nil; } } @end
6: Inheritance
Listing 6-3
Appleh
#import <Foundation/Foundationh> #import "Fruith" @interface Apple : Fruit { } @end
Listing 6-4
Applem
#import "Appleh" @implementation Apple @end
Listing 6-5
Orangeh
#import <Foundation/Foundationh> #import "Fruith" @interface Orange : Fruit { } @end
Listing 6-6
Orangem
#import "Orangeh" @implementation Orange @end
Listing 6-7
Environmenth
#import <Foundation/Foundationh> @class "Fruith" @class "Appleh" @class "Orangeh" @interface Environment : NSObject { NSTimer * myTimer; Apple * myApple; Orange * myOrange; }
(continued)
Objective-C for iPhone Developers: A Beginner s Guide
@property (nonatomic,retain) Apple * myApple; @property (nonatomic,retain) Orange * myOrange; - (void) handleTimeSecond; - (void) startTime; @end
Listing 6-8
Environmentm
#import "Environmenth" #import "Appleh" #import "Orangeh" #import "Fruith" @implementation Environment @synthesize myOrange; @synthesize myApple; - (id) init { if([super init] == nil) return nil; Apple * tempApple = [[Apple alloc] init]; selfmyApple = tempApple; [tempApple release]; Orange * tempOrange = [[Orange alloc] init]; selfmyOrange = tempOrange; [tempOrange release]; [self startTime]; NSLog(@"is a kind of Fruit:%i", [selfmyApple isKindOfClass: [Fruit class]]); NSLog(@"is a subclass of Fruit:%i", [[Orange class] isSubclassOfClass: [Fruit class]]); NSLog(@"does orange respond to ripen:%i", [selfmyOrange respondsToSelector:@selector(ripen)]); NSLog(@"does orange respond to foo:%i", [selfmyOrange respondsToSelector:@selector(foo)]); return self; } - (void) startTime { myTimer = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(handleTimeSecond) userInfo:nil repeats:YES]; } - (void) handleTimeSecond { [selfmyApple ripen]; NSLog(@"apple's state:%@", [selfmyApple getState]); [selfmyOrange ripen]; NSLog(@"orange's state:%@", [selfmyOrange getState]); if([[selfmyApple getState] isEqualToString:@"putrid"] && [[selfmyOrange getState] isEqualToString:@"putrid"]) {
6: Inheritance
[myTimer invalidate]; } } - (void) dealloc { [selfmyApple release]; [selfmyOrange release]; [super dealloc]; } @end
Listing 6-9
SimpleInheritanceAppDelegateh
#import <UIKit/UIKith> #import "Environmenth" @class SimpleInheritanceViewController; @interface SimpleInheritanceAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; SimpleInheritanceViewController *viewController; Environment * myEnvironment; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet SimpleInheritanceViewController *viewController; @property (nonatomic, retain) Environment * myEnvironment; @end
Listing 6-10
SimpleInheritanceAppDelegatem
#import "SimpleInheritanceAppDelegateh" #import "SimpleInheritanceViewControllerh" @implementation SimpleInheritanceAppDelegate @synthesize window; @synthesize viewController; @synthesize myEnvironment; - (void)applicationDidFinishLaunching:(UIApplication *)application { Environment * tempE = [[Environment alloc] init]; selfmyEnvironment = tempE; [tempE release]; [window addSubview:viewControllerview]; [window makeKeyAndVisible]; }
(continued)
Objective-C for iPhone Developers: A Beginner s Guide
- (void)dealloc { [viewController release]; [window release]; [myEnvironment release]; [super dealloc]; } @end
Listing 6-11
Debugger console logging
is a kind of Fruit:1 is a subclass of Fruit:1 does orange respond to ripen:1 does orange respond to foo:0 apple's state:ripe orange's state:ripe apple's state:very ripe orange's state:very ripe apple's state:rotten orange's state:rotten apple's state:very rotten orange's state:very rotten apple's state:putrid orange's state:putrid
In this example, you created a base class of type Fruit (Listings 6-1 and 6-2) You then created Apple and Orange child classes (Listings 6-3 through 6-6) You specified each inherited from Fruit
@interface Orange : Fruit { @interface Apple : Fruit {
Due to the environment, all fruit eventually ripen You modeled this natural process as a method in the Fruit class, naming the method ripen You also created the state instance variable in Fruit to represent the fruit s state of decay Fruits progress from unripened to putrid, and these states are defined as constants in Fruit s header
#define #define #define #define #define #define UNRIPE 0 RIPE 1 VERY_RIPE 2 ROTTEN 3 VERY_ROTTEN 4 PUTRID 5
6: Inheritance
Because both Apple and Orange inherit from Fruit, they both have the ripen and getState methods and they both have the state variable available to them The Environment class models time using an NSTimer When initialized, the Environment class starts keeping the time Time is represented using an NSTimer class A new timer is created that fires the handleTimeSecond method every one second
myTimer = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(handleTimeSecond) userInfo:nil repeats:YES];
Every second, the timer fires the handleTimeSecond method The handleTimeSecond method then sends a ripen message to Apple and Orange Behind the scenes, the runtime sees if myApple or myOrange can respond to the ripen message sent by myEnvironment Neither can, and so the runtime checks each class parent class for the method, finds it, and calls it instead It does the same with the getState method Figure 6-4 illustrates how the runtime handles inherited methods When an Orange instance is sent a ripen message, the runtime first checks to see if Orange can respond to the message If it cannot, then it checks Orange s parent The runtime continues checking Orange s ancestor hierarchy until it either finds a class that can respond to the message or it reaches NSObject If no ancestor class can react to the message, then a runtime error occurs
Copyright © OnBarcode.com . All rights reserved.