【Objective-C基础】自定义对象归档

原文：http://www.2cto.com/kf/201310/248270.html
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];    }

结束！