归档（转）

#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

@implementation User

@synthesize userName = _userName;

@synthesize userAge = _userAge;

// 实现归档操作

- (void)encodeWithCoder:(NSCoder *)aCoder

{

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

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

}

// 实现解档操作

- (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.

    // 归档（序列化和反序列化） - 存储自定义对象

    User *user = [[User alloc] init];

    user.userAge = 30;

    user.userName = @"张三";

    // 归档操作(将归档数据写入NSMutableData中，然后将NSMutableData对象写成文件)

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

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

    // 写入数据

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

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

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

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

    // 写入完毕 

    [archiver finishEncoding];

    [archiver release];

    // 将data写成文件

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

    [data release];

    // 解档(先把文件读取成NSMutableData然后从data中解出数据)

    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;

}