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
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#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
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#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
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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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