objc对象归档 序列化

NSString、NSArray、NSData、NSDictionary都实现了NSCoding协议，可直接通过调用writeToFile归档，那么OBJC自定义对象类型呢？首先实现NSCoding协议，重写encodeWithCode方法和initWithCode方法，然后通过NSKeyedArchiver转换为NSData，然后通过NSData的writeToFile方法写入到文件，或者将转换后的NSData放入到NSArray或NSDictionary中调用writeToFile写入到文件便可实现包装了自定义类型的数据和字典的归档；通过NSKeyedUnarchiver读取归档文件到对象，或者通过NSArray的arrrayWithContentsOfFile或NSDictionary的dictionaryWithContentsOfFile到数组对象或字典，然后取出序列化过的自定义对象（即自定义对象的NSData形式），然后通过NSKeyedUnarchiver反归档到对象。

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1. ------------------------------------------------测试代码------------------------------------------------   
2.    
3. NSString *str = @"hello";   
4.     [str writeToFile:@"/Users/lili/Desktop/str.txt" atomically:YES encoding:NSUTF8StringEncoding error:nil];   
5.        
6.     NSArray *arr = [[NSArray alloc]initWithObjects:@"lili",@"tata", nil];   
7.     [arr writeToFile:@"/Users/lili/Desktop/arr.txt" atomically:YES];   
8.        
9.     NSDictionary *dict = [NSDictionary dictionaryWithObjects:@[@"lili",@"男"] forKeys:@[@"name",@"sex"]];   
10.     [dict writeToFile:@"/Users/lili/Desktop/dict.txt" atomically:YES];   
11.        
12.        
13.     Person *parent = [[Person alloc]init];   
14.     parent.age = 40;   
15.     parent.name = @"lili";   
16.        
17.     Person *child = [[Person alloc]init];   
18.     child.age = 22;   
19.     child.name = @"linian";   
20.        
21.     parent.child = child;   
22.        
23.     NSData *data = [NSKeyedArchiver archivedDataWithRootObject:parent];   
24.     [data writeToFile:@"/Users/lili/Desktop/data.txt" atomically:YES];   
25.        
26.     Person *people = [NSKeyedUnarchiver unarchiveObjectWithFile:@"/Users/lili/Desktop/data.txt"];   
27.     NSLog(@"%@",people);   
28.        
29.     NSDictionary *dictPerson = [NSDictionary dictionaryWithObjects:@[[NSKeyedArchiver archivedDataWithRootObject:parent],[NSKeyedArchiver archivedDataWithRootObject:child]] forKeys:@[@"parent",@"child"]];   
30.     [dictPerson writeToFile:@"/Users/lili/Desktop/dictPerson.txt" atomically:YES];   
31.        
32.     NSDictionary *pdict = [NSDictionary dictionaryWithContentsOfFile:@"/Users/lili/Desktop/dictPerson.txt"];   
33.     Person *tPerson = [NSKeyedUnarchiver unarchiveObjectWithData:[pdict objectForKey:@"parent"]];   
34.     NSLog(@"%@",tPerson);   
35.        
36.        
37.        
38.     NSArray *arrPerson = [[NSArray alloc]initWithObjects:[NSKeyedArchiver archivedDataWithRootObject:parent],[NSKeyedArchiver archivedDataWithRootObject:parent], nil];   
39.     [arrPerson writeToFile:@"/Users/lili/Desktop/arrPerson.txt" atomically:YES];   
40.        
41.     NSArray *pArr = [NSArray arrayWithContentsOfFile:@"/Users/lili/Desktop/arrPerson.txt"];   
42.     Person *aPerson = [NSKeyedUnarchiver unarchiveObjectWithData:[pArr objectAtIndex:0]];   
43.     NSLog(@"%@",aPerson);   
44.    
45.    
46. ------------------------------------------------Person类------------------------------------------------   
47.    
48. #import <Foundation/Foundation.h>   
49. @interface Person : NSObject<NSCoding>   
50. @property(strong,nonatomic)Person *child;   
51. @property(assign,nonatomic)int age;   
52. @property(copy,nonatomic)NSString *name;   
53. @end   
54.    
55.    
56. #import "Person.h"   
57. @implementation Person   
58. -(NSString *)description   
59. {   
60.     return [NSString stringWithFormat:@"{age:%d,name:%@,child:%@}",self.age,self.name,self.child];   
61. }   
62.    
63. -(void)encodeWithCoder:(NSCoder *)aCoder   
64. {   
65.     [aCoder encodeInt:self.age forKey:@"age"];   
66.     [aCoder encodeObject:self.name forKey:@"name"];   
67.     [aCoder encodeObject:self.child forKey:@"child"];   
68. }   
69.    
70. -(id)initWithCoder:(NSCoder *)aDecoder   
71. {   
72.     if(self = [super init]){   
73.         self.age = [aDecoder decodeIntForKey:@"age"];   
74.         self.name = [aDecoder decodeObjectForKey:@"name"];   
75.         self.child = [aDecoder decodeObjectForKey:@"child"];   
76.     }   
77.     return self;   
78. }   
79. @end