歸檔（轉）

如果是自定義類型的歸檔和解檔，是按以下步驟實現

如果不是自定義類型，直接第四步就可以。

一、創建一個類User
二、在User.h中遵循NSCoding協議

#import?<Foundation/Foundation.h>

?

@interface?User :?NSObject<NSCoding>

{

? ??int?_userAge;//例子

? ??NSString?*_userName;//

}

@property(nonatomic,assign)int?userAge;

@property(nonatomic,copy)NSString?*userName;

@end

三、在User.m中實現協議中的歸檔，解檔方法

@implementation?User

@synthesize?userName =?_userName;

@synthesize?userAge =?_userAge;

?

//?實現歸檔操作

- (void)encodeWithCoder:(NSCoder?*)aCoder

{

? ? [aCoder?encodeObject:_userName?forKey:@"username"];

? ? [aCoder?encodeInt:_userAge?forKey:@"userage"];

}

?

//?實現解檔操作

- (id)initWithCoder:(NSCoder?*)aDecoder

{

? ??_userAge?= [aDecoder?decodeIntForKey:@"userage"];

? ??_userName?= [aDecoder?decodeObjectForKey:@"username"];

? ??return?self;

}

@end

四、在AppDelegate.m中包含user.h

?

#import?"AppDelegate.h"

#import?"User.h"

?

?

@implementation?AppDelegate

@synthesize?window=_window;

?

- (void)dealloc

{

? ? [_window?release];

? ? [super?dealloc];

}

?

- (BOOL)application:(UIApplication?*)application didFinishLaunchingWithOptions:(NSDictionary?*)launchOptions

{

? ??self.window?= [[[UIWindow?alloc]?initWithFrame:[[UIScreen?mainScreen]?bounds]]autorelease];

? ??// Override point for customization after application launch.

?? ?

?? ?

? ??//?歸檔（序列化和反序列化）?-?存儲自定義對象

?? ?

? ??User?*user = [[User?alloc]?init];

? ? user.userAge?= 30;

? ? user.userName?=?@"張三";

?? ?

? ??//?歸檔操作(將歸檔數據寫入NSMutableData中，然后將NSMutableData對象寫成文件)

? ??NSMutableData?*data = [[NSMutableData?alloc]?init];

? ??NSKeyedArchiver?*archiver = [[NSKeyedArchiver?alloc]initForWritingWithMutableData:data];

? ??//?寫入數據

? ? [archiver?encodeObject:@"test"?forKey:@"username"];

? ? [archiver?encodeObject:@"123456"?forKey:@"userpassword"];

? ? [archiver?encodeInt:111?forKey:@"number"];

? ? [archiver?encodeObject:user?forKey:@"user"];

? ??//?寫入完畢?

? ? [archiver?finishEncoding];

? ? [archiver?release];

? ??//?將data寫成文件

? ? [data?writeToFile:[NSStringstringWithFormat:@"%@/Library/Caches/user.archiver",NSHomeDirectory()]?atomically:NO];

? ? [data?release];

?? ?

?? ?

? ??//?解檔(先把文件讀取成NSMutableData然后從data中解出數據)

? ??NSMutableData?*contentData = [[NSMutableData?alloc]?initWithContentsOfFile:[NSStringstringWithFormat:@"%@/Library/Caches/user.archiver",NSHomeDirectory()]];

? ??NSKeyedUnarchiver?*unarchiver = [[NSKeyedUnarchiver?alloc]initForReadingWithData:contentData];

? ??int?number = [unarchiver?decodeIntForKey:@"number"];

? ??NSString?*username = [unarchiver?decodeObjectForKey:@"username"];

? ??NSString?*userpassword = [unarchiver?decodeObjectForKey:@"userpassword"];

? ??User?*contentUser = [unarchiver?decodeObjectForKey:@"user"];

?? ?

? ??NSLog(@"user.userAge = %d",contentUser.userAge);

? ??NSLog(@"user.userName = %@",contentUser.userName);

? ??NSLog(@"number = %d",number);

? ??NSLog(@"username = %@",username);

? ??NSLog(@"userpassword = %@",userpassword);

?? ?

?? ?

?? ?

? ??self.window.backgroundColor?= [UIColor?whiteColor];

? ? [self.window?makeKeyAndVisible];

? ??return?YES;

}