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Objective-C for iPhone Developers: A Beginner s Guide
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else { NSLog(@"SuperFoo's Name:%@", selfmyFoomySuperName); NSLog(@"Bar's Name:%@", selfmyFoomyBarbarName); } selfnametext = myFooname; selfquantitytext = [myFooquantity stringValue]; incrementer = [myFooquantity intValue] + 1; } - (void) viewDidDisappear: (BOOL) animated { [super viewDidDisappear:animated]; if(incrementer % 2 == 0) selfmyFooname = [[NSString alloc] initWithString:@"Tom"]; else selfmyFooname = [[NSString alloc] initWithString:@"Sally"]; selfmyFooquantity = [[NSNumber alloc] initWithInt:incrementer]; NSString * path = nil; path = [(NSString *) [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"fooarchive"]; [NSKeyedArchiver archiveRootObject:selfmyFoo toFile:path]; } - (void)flipsideViewControllerDidFinish:(FlipsideViewController *)controller { [self dismissModalViewControllerAnimated:YES]; } - (IBAction)showInfo { FlipsideViewController *controller = [[FlipsideViewController alloc] initWithNibName:@"FlipsideView" bundle:nil]; controllerdelegate = self; controllermodalTransitionStyle = UIModalTransitionStyleFlipHorizontal; [self presentModalViewController:controller animated:YES]; [controller release]; } - (void)dealloc { [myFoo release]; [name release]; [quantity release]; [super dealloc]; } @end
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As this example illustrates, you can persist other objects the root object has relationships with, provided those objects also implement the NSCoding protocol In Foo s encode WithCoder: method it encodes its Bar instance Doing this invokes Bar s encodeWith Coder: method
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[aCoder encodeObject:selfmyBar forKey:@"bar"];
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Property Lists, NSCopy, and Archiving
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In Foo s initWithCoder: method it decodes its Bar instance, which invokes Bar s decodeObjectForKey: method
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selfmyBar = [aDecoder decodeObjectForKey:@"bar"];
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Also notice that if an archivable object inherits from a parent, the initWithCoder: method should call the parent s initWithCoder: method
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if( (self = [super initWithCoder:aDecoder])!=nil)
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The child object should also invoke its parent s encodeWithCoder: method
[super encodeWithCoder:aCoder];
Archiving Multiple Classes
Although archiving a single object and the classes it has a relationship with is useful, there are many times when you might wish to archive multiple unrelated objects at the same time You archive multiple objects at once by using a mutable data buffer and an NSKeyedArchiver What you do is create a data buffer that you can add data to
NSMutableData * theData = [NSMutableData data];
You then initialize the NSKeyedArchiver with the data buffer
NSKeyedArchiver * archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:theData];
After initializing the archiver, you encode the objects
[archiver encodeObject:myFoos forKey:@"myFoos"]; [archiver encodeObject:myName forKey:@"myName"];
After encoding all the objects you wish to encode, you send a message to the archiver telling it that you are finished encoding And you then write the data buffer to a file
[archiver finishEncoding]; [theData writeToFile:pathToFile atomically:NO]
Reconstituting the objects from the archive is a similar process You first read the data into an NSData object
NSData * data = [NSData dataWithContentsOfFile:pathToFile];
Objective-C for iPhone Developers: A Beginner s Guide
You then create an NSKeyedUnarchiver and initialize it with the NSData instance
NSKeyedUnarchiver * unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
You then decode the data into the respective classes
myFoos = [unarchiver decodeObjectForKey:@"myFoos"]; myName = [unarchiver decodeObjectForKey:@"myName"];
After reconstituting the objects from the NSData instance, you then send a message to the unarchiver, telling it that you are finished decoding, and you then release the unarchiver
[unarchiver finishDecoding]; [unarchiver release];
You can archive and unarchive any class that adopts the NSCoding protocol using this technique Moreover, you can archive and unarchive as many of those objects as you wish to a single archive file This flexibility makes archiving an easy, yet powerful way to persist your application s objects
NOTE
If you unarchive a nonexistent object, the archiver returns zero for numeric values and nil for objects
Try This
Creating an Archive with Multiple Object Types
1 Create a View-based application named AdvancedArchive 2 Create a new NSObject class named Foo and implement name and quantity
properties, as in the previous example (Listings 10-18 and 10-19)
3 Open AdvancedArchiveAppDelegateh and add two properties, an NSMutableArray
and an NSString (Listing 10-20)
4 Open AdvancedArchiveAppDelegatem, synthesize the two properties, and implement
the applicationDidFinishLaunching: and applicationWillResign Active: methods as in Listing 10-21
10:
Property Lists, NSCopy, and Archiving
5 Build and Run the application The application logs its output to the debugger console
(Listing 10-22)
Listing 10-18 Fooh
#import <Foundation/Foundationh> @interface Foo : NSObject <NSCoding> { NSString * name; NSNumber * quantity; } @property (nonatomic, retain) NSString * name; @property (nonatomic, retain) NSNumber * quantity; @end
Listing 10-19
Foom
#import "Fooh" @implementation Foo @synthesize name; @synthesize quantity; - (void) encodeWithCoder:(NSCoder *)aCoder { [aCoder encodeObject:name forKey:@"name"]; [aCoder encodeInt:[quantity intValue] forKey:@"quantity"]; } -(id) initWithCoder:(NSCoder *)aDecoder { if( (self = [super init])!=nil) { selfname = [aDecoder decodeObjectForKey:@"name"]; selfquantity = [NSNumber numberWithInt:[aDecoder decodeIntForKey:@"quantity"]]; } return self; } @end
Listing 10-20
AdvancedArchiveAppDelegateh
#import <UIKit/UIKith>
@class AdvancedArchiveViewController; @interface AdvancedArchiveAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; AdvancedArchiveViewController *viewController;
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