Objective-C基础 自定义对象归档详解及简单实例

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=@"[e-mail]";
  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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