自定义一个Person类
Person.h里面
#import <Foundation/Foundation.h>
//遵循一个NSCoding协议
@interface Person : NSObject<NSCoding>
//定义三个person类的属性
@property(strong,nonatomic)NSString *name;
@property(assign,nonatomic)int age;
@property(strong,nonatomic)NSString *addr;
@end
Person.m里面
#import "Person.h"
#import <objc/runtime.h>
@implementation Person
//实现编码方法
-(void)encodeWithCoder:(NSCoder *)aCoder
{
unsigned int count;
//获取指向当前类的所有属性的指针
objc_property_t *properties=class_copyPropertyList([self class], &count);
for (int i=0; i<count; i++)
{
//获取指向当前类的一个属性的指针
objc_property_t property=properties[i];
//获取C字符串属性名
const char *name=property_getName(property);
//C字符串转OC字符串
NSString *propertyName=[NSString stringWithUTF8String:name];
//通过关键字取值
NSString *propertyValue=[self valueForKey:propertyName];
//对属性进行编码
[aCoder encodeObject:propertyValue forKey:propertyName];
}
//释放
free(properties);
}
//实现解码方法
-(instancetype)initWithCoder:(NSCoder *)aDecoder
{
unsigned int count;
//获取指向当前类的所有属性的指针
objc_property_t *properties=class_copyPropertyList([self class], &count);
for (int i=0; i<count; i++)
{
//获取指向当前类的一个属性的指针
objc_property_t property=properties[i];
//获取C字符串属性名
const char *name=property_getName(property);
//C字符串转OC字符串
NSString *propertyName=[NSString stringWithUTF8String:name];
//通过关键字取值
NSString *propertyValue=[self valueForKey:propertyName];
//对属性进行解码
[self setValue:propertyValue forKey:propertyName];
}
//释放
free(properties);
return self;
}
//归档和结档
-(void)test
{
Person *person=[[Person alloc] init];
person.name=@"小明";
person.age=11;
person.addr=@"贵阳";
NSString *path=[NSString stringWithFormat:@"%@/archive",NSHomeDirectory()];
[NSKeyedArchiver archiveRootObject:person toFile:path];
Person *unarchiverPerson=[NSKeyedUnarchiver unarchiveObjectWithFile:path];
NSLog(@"unarchiverPerson=%@ %@",path,unarchiverPerson);
}
@end
原文：http://www.cnblogs.com/layios/p/5371367.html