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。

------------------------------------------------测试代码------------------------------------------------ 
 
NSString *str = @"hello"; 
    [str writeToFile:@"/Users/lili/Desktop/str.txt" atomically:YES encoding:NSUTF8StringEncoding error:nil]; 
     
    NSArray *arr = [[NSArray alloc]initWithObjects:@"lili",@"tata", nil]; 
    [arr writeToFile:@"/Users/lili/Desktop/arr.txt" atomically:YES]; 
     
    NSDictionary *dict = [NSDictionary dictionaryWithObjects:@[@"lili",@"男"] forKeys:@[@"name",@"sex"]]; 
    [dict writeToFile:@"/Users/lili/Desktop/dict.txt" atomically:YES]; 
     
     
    Person *parent = [[Person alloc]init]; 
    parent.age = 40; 
    parent.name = @"lili"; 
     
    Person *child = [[Person alloc]init]; 
    child.age = 22; 
    child.name = @"linian"; 
     
    parent.child = child; 
     
    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:parent]; 
    [data writeToFile:@"/Users/lili/Desktop/data.txt" atomically:YES]; 
     
    Person *people = [NSKeyedUnarchiver unarchiveObjectWithFile:@"/Users/lili/Desktop/data.txt"]; 
    NSLog(@"%@",people); 
     
    NSDictionary *dictPerson = [NSDictionary dictionaryWithObjects:@[[NSKeyedArchiver archivedDataWithRootObject:parent],[NSKeyedArchiver archivedDataWithRootObject:child]] forKeys:@[@"parent",@"child"]]; 
    [dictPerson writeToFile:@"/Users/lili/Desktop/dictPerson.txt" atomically:YES]; 
     
    NSDictionary *pdict = [NSDictionary dictionaryWithContentsOfFile:@"/Users/lili/Desktop/dictPerson.txt"]; 
    Person *tPerson = [NSKeyedUnarchiver unarchiveObjectWithData:[pdict objectForKey:@"parent"]]; 
    NSLog(@"%@",tPerson); 
     
     
     
    NSArray *arrPerson = [[NSArray alloc]initWithObjects:[NSKeyedArchiver archivedDataWithRootObject:parent],[NSKeyedArchiver archivedDataWithRootObject:parent], nil]; 
    [arrPerson writeToFile:@"/Users/lili/Desktop/arrPerson.txt" atomically:YES]; 
     
    NSArray *pArr = [NSArray arrayWithContentsOfFile:@"/Users/lili/Desktop/arrPerson.txt"]; 
    Person *aPerson = [NSKeyedUnarchiver unarchiveObjectWithData:[pArr objectAtIndex:0]]; 
    NSLog(@"%@",aPerson); 
 
 
------------------------------------------------Person类------------------------------------------------ 
 
#import <Foundation/Foundation.h> 
@interface Person : NSObject<NSCoding> 
@property(strong,nonatomic)Person *child; 
@property(assign,nonatomic)int age; 
@property(copy,nonatomic)NSString *name; 
@end 
 
 
#import "Person.h" 
@implementation Person 
-(NSString *)description 
{ 
    return [NSString stringWithFormat:@"{age:%d,name:%@,child:%@}",self.age,self.name,self.child]; 
} 
 
-(void)encodeWithCoder:(NSCoder *)aCoder 
{ 
    [aCoder encodeInt:self.age forKey:@"age"]; 
    [aCoder encodeObject:self.name forKey:@"name"]; 
    [aCoder encodeObject:self.child forKey:@"child"]; 
} 
 
-(id)initWithCoder:(NSCoder *)aDecoder 
{ 
    if(self = [super init]){ 
        self.age = [aDecoder decodeIntForKey:@"age"]; 
        self.name = [aDecoder decodeObjectForKey:@"name"]; 
        self.child = [aDecoder decodeObjectForKey:@"child"]; 
    } 
    return self; 
} 
@end