iOS对象序列化

系统对象的归档我就不介绍了，这个不复杂，自己看一下就会了。

我在这里主要介绍自定义对象的归档。

Sample.h文件

//
//  Sample.h
//  Serialization
//
//  Created by 周 敏 on 12-11-1.
//  Copyright (c) 2012年 周 敏. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Sample : NSObject<NSCoding> {

    NSString* name;
    int magicNumber;
    float shoeSize;
    NSMutableArray *subThingies;
}

@property(copy) NSString* name;
@property int magicNumber;
@property float shoeSize;
@property (retain) NSMutableArray *subThingies;


-(id) initWithName:(NSString *)n magicNumber:(int)m shoeSize:(float) ss;

@end

Sample.m文件

//
//  Sample.m
//  Serialization
//
//  Created by 周 敏 on 12-11-1.
//  Copyright (c) 2012年 周 敏. All rights reserved.
//

#import "Sample.h"

@implementation Sample

@synthesize name;
@synthesize magicNumber;
@synthesize shoeSize;
@synthesize subThingies;

-(id) initWithName:(NSString *)n magicNumber:(int)m shoeSize:(float)ss
{
    if (self=[super init])
    {
        self.name = n;
        self.magicNumber = m;
        self.shoeSize = ss;
        self.subThingies = [NSMutableArray array];
    }
    return (self);
}

-(void) dealloc
{
    [name release];
    [subThingies release];
    [super dealloc];
}

//将对象编码(即:序列化)
-(void) encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:name forKey:@"name"];
    [aCoder encodeInt:magicNumber forKey:@"magicNumber"];
    [aCoder encodeFloat:shoeSize forKey:@"shoeSize"];
    [aCoder encodeObject:subThingies forKey:@"subThingies"];
}

//将对象解码(反序列化)
-(id) initWithCoder:(NSCoder *)aDecoder
{
    if (self=[super init])
    {
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.magicNumber = [aDecoder decodeIntForKey:@"magicNumber"];
        self.shoeSize = [aDecoder decodeFloatForKey:@"shoeSize"];
        self.subThingies = [aDecoder decodeObjectForKey:@"subThingies"];
    }
    return (self);

}


-(NSString*) description
{
    NSString *description = [NSString stringWithFormat:@"%@:%d/%.1f %@",name,magicNumber,shoeSize,subThingies];
    return (description);
}

@end

使用模版

NSString *path = [NSString stringWithFormat:@"%@/Documents/archive.dat", NSHomeDirectory()];
Sample *s1 = [[Sample alloc] initWithName:@"thing1" magicNumber:42 shoeSize:10.5];
[s1.subThingies addObject:@"1"];
[s1.subThingies addObject:@"2"];
//序列化
NSData  *data1 = [NSKeyedArchiver archivedDataWithRootObject:s1];//将s1序列化后,保存到NSData中
[s1 release];
[data1 writeToFile:path atomically:YES];//持久化保存成物理文件
//反序列化
NSData *data2 = [NSData dataWithContentsOfFile:path];//读取文件
Sample *s2 = [NSKeyedUnarchiver unarchiveObjectWithData:data2];//反序列化
NSLog(@"%@",s2);

如果是多个这类对象组成的数组，序列化也很简单，只须对这个数组进行序列化。

Sample *s1 = [[Sample alloc] initWithName:@"thing1" magicNumber:42 shoeSize:10.5];
[s1.subThingies addObject:@"1"];
[s1.subThingies addObject:@"2"];

Sample *s2 = [[Sample alloc] initWithName:@"thing2" magicNumber:22 shoeSize:22.2];
[s2.subThingies addObject:@"22"];
[s2.subThingies addObject:@"22"];

NSArray *array = [NSArray arrayWithObjects:s1, s2, nil];
[s1 release];
[s2 release];

NSString *path = [NSString stringWithFormat:@"%@/Documents/archive.dat", NSHomeDirectory()];
//序列化
NSData  *data1 = [NSKeyedArchiver archivedDataWithRootObject:array];
[data1 writeToFile:path atomically:YES];//持久化保存成物理文件
//房序列化
NSData *data2 = [NSData dataWithContentsOfFile:path];//读取文件
NSArray *array2 = [NSKeyedUnarchiver unarchiveObjectWithData:data2];//反序列化
NSLog(@"%@",array2);