iOS对象序列化

浏览数：24 / 时间：2015年06月11日

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

 9 #import <Foundation/Foundation.h>
10 
11 @interface Sample : NSObject<NSCoding> {
12     
13     NSString* name;
14     int magicNumber;
15     float shoeSize;
16     NSMutableArray *subThingies;
17 }
18 
19 @property(copy) NSString* name;
20 @property int magicNumber;
21 @property float shoeSize;
22 @property (retain) NSMutableArray *subThingies;
23 
24 
25 -(id) initWithName:(NSString *)n magicNumber:(int)m shoeSize:(float) ss;
26 
27 @end

Sample.m文件

 9 #import "Sample.h"
10 
11 @implementation Sample
12 
13 @synthesize name;
14 @synthesize magicNumber;
15 @synthesize shoeSize;
16 @synthesize subThingies;
17 
18 -(id) initWithName:(NSString *)n magicNumber:(int)m shoeSize:(float)ss
19 {
20     if (self=[super init])
21     {
22         self.name = n;
23         self.magicNumber = m;
24         self.shoeSize = ss;
25         self.subThingies = [NSMutableArray array];
26     }
27     return (self);
28 }
29 
30 -(void) dealloc
31 {
32     [name release];
33     [subThingies release];
34     [super dealloc];
35 }
36 
37 //将对象编码(即:序列化)
38 -(void) encodeWithCoder:(NSCoder *)aCoder
39 {
40     [aCoder encodeObject:name forKey:@"name"];
41     [aCoder encodeInt:magicNumber forKey:@"magicNumber"];
42     [aCoder    encodeFloat:shoeSize forKey:@"shoeSize"];
43     [aCoder    encodeObject:subThingies forKey:@"subThingies"];
44 }
45 
46 //将对象解码(反序列化)
47 -(id) initWithCoder:(NSCoder *)aDecoder
48 {
49     if (self=[super init])
50     {
51         self.name = [aDecoder decodeObjectForKey:@"name"];
52         self.magicNumber = [aDecoder decodeIntForKey:@"magicNumber"];
53         self.shoeSize = [aDecoder decodeFloatForKey:@"shoeSize"];
54         self.subThingies = [aDecoder decodeObjectForKey:@"subThingies"];
55     }
56     return (self);
57     
58 }
59 
60 
61 -(NSString*) description
62 {
63     NSString *description = [NSString stringWithFormat:@"%@:%d/%.1f %@",name,magicNumber,shoeSize,subThingies];
64     return (description);
65 }
66 
67 @end

使用模板

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

 1 Sample *s1 = [[Sample alloc] initWithName:@"thing1" magicNumber:42 shoeSize:10.5];  
 2 [s1.subThingies addObject:@"1"];  
 3 [s1.subThingies addObject:@"2"];  
 4      
 5 Sample *s2 = [[Sample alloc] initWithName:@"thing2" magicNumber:22 shoeSize:22.2];  
 6 [s2.subThingies addObject:@"22"];  
 7 [s2.subThingies addObject:@"22"];  
 8      
 9 NSArray *array = [NSArray arrayWithObjects:s1, s2, nil]; 
10 [s1 release];
11 [s2 release];
12 
13 NSString *path = [NSString stringWithFormat:@"%@/Documents/archive.dat", NSHomeDirectory()];
14 //序列化  
15 NSData  *data1 = [NSKeyedArchiver archivedDataWithRootObject:array];
16 [data1 writeToFile:path atomically:YES];//持久化保存成物理文件  
17 //房序列化  
18 NSData *data2 = [NSData dataWithContentsOfFile:path];//读取文件  
19 NSArray *array2 = [NSKeyedUnarchiver unarchiveObjectWithData:data2];//反序列化  
20 NSLog(@"%@",array2);