自定义对象要实现归档必须实现NSCoding协议

 NSCoding协议有两个方法，encodeWithCoder方法对对象的属性数据做编码处理，initWithCoder解码归档数据来初始化对象。

示例1

.h头文件

 #import <Foundation/Foundation.h>
 @interface user : NSObject <NSCoding>
 @property(nonatomic,retain)NSString *name;
 @property(nonatomic,retain)NSString *email;
 @property(nonatomic,retain)NSString *pwd;
 @property(nonatomic,assign)int age;
 @end

.m实现文件

#import "user.h"
#define AGE @"age"
#define NAME @"name"
#define EMAIL @"email"
#define PASSWORD @"password"
@implementation user
//对属性编码
- (void)encodeWithCoder:(NSCoder *)aCoder
{
  [aCoder encodeInt:_age forKey:@"age"];
  [aCoder encodeObject:_name forKey:AGE];
  [aCoder encodeObject:_email forKey:EMAIL];
  [aCoder encodeObject:_pwd forKey:PASSWORD];
}
//对属性解码
- (id)initWithCoder:(NSCoder *)aDecoder
{
  self=[super init];
  if(self)
  {
    self.age=[aDecoderdecodeIntForKey:AGE];
    self.name=[aDecoderdecodeObjectForKey:NAME];
    self.email=[aDecoderdecodeObjectForKey:EMAIL];
    self.pwd=[aDecoderdecodeObjectForKey:PASSWORD];
  }
  return self;
}
-(void)dealloc
{
  [_name release];
  [_email release];
  [_pwd release];
  [super dealloc];
}
@end

main函数的调用

  user *userObj=[[user alloc] init];
  userObj.age=33;
  userObj.email=@"adfdadf@qq.com";
  userObj.pwd=@"212212";
  userObj.name=@"ricard";
  NSString *path=[NSHomeDirectory() stringByAppendingPathComponent:@"Desktop/custom.text"];
  BOOL succ=[NSKeyedArchiver archiveRootObject:userObj toFile:path];
  if (succ) {
     NSLog(@"Hello, World!");
     user *usertemp=[NSKeyedUnarchiver unarchiveObjectWithFile:path];
  }

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