IOS- NSCoding协议,NSKeyedArchiver自定义类归档使用详解

使用NSCoding协议可以实现归档自定义的类,NSKeyedArchiver可以归档我们自定义的类;要实现自定义类的归档,需要实现

encodeWithCoder(编码)和initWithCoder(解码)

我创建一个自定义的Student类,遵循NSCoding协议,实现这两个方法:

//
//  Student.h
//  UserList
//
//  Created by http://blog.csdn.net/yangbingbinga on 14/11/14.
//  Copyright (c) 2014年 http://blog.csdn.net/yangbingbinga. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Student : NSObject<NSCoding>

@property(nonatomic,strong)NSString * name;
@property(nonatomic,strong)NSString * age;

@end

.m文件

//
//  Student.m
//  UserList
//
//  Created by yb on 14/11/14.
//  Copyright (c) 2014年 http://blog.csdn.net/yangbingbinga. All rights reserved.
//

#import "Student.h"

@implementation Student

- (void)encodeWithCoder:(NSCoder *)aCoder
{
    NSLog(@"%s",__FUNCTION__);
    [aCoder encodeObject:self.name forKey:@"name"];
    [aCoder encodeObject:self.age forKey:@"age"];

}
- (id)initWithCoder:(NSCoder *)aDecoder
{
    NSLog(@"%s",__FUNCTION__);
    self.name = [aDecoder decodeObjectForKey:@"name"];
    self.age = [aDecoder decodeObjectForKey:@"age"];

    return self;
}

@end

我们可以直接在appDelegate中测试一下,如何 归档 和 读取 归档的数据:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    Student * stu = [[Student alloc]init];
    stu.name = @"123";
    stu.age = @"3";
    NSData * stuD = [NSKeyedArchiver archivedDataWithRootObject:stu];//归档,调用encodeWithCoder方法

    Student * stu1 = [NSKeyedUnarchiver unarchiveObjectWithData:stuD];//读取归档数据,调用initWithCoder
    NSLog(@"stu1.name = %@",stu1.name);
    return YES;
}

原文地址:http://blog.csdn.net/yangbingbinga