OC 数据持久化（数据本地化）- 本地存储

 //
 //  ViewController.m
 //  IOS_0113_本地存储
 //
 //  Created by ma c on 16/1/13.
 //  Copyright (c) 2016年 博文科技. All rights reserved.
 //

 #import "ViewController.h"
 #import "BWLoginDataModel.h"
 #import "BWSecondViewController.h"

 @interface ViewController ()

 @end

 @implementation ViewController
 /*
  数据本地化（数据持久化）- 本地存储
  1.NSUserDefault属性列表存储 - 轻量级数据，存储类型有限
  2.归档 - 大量数据，存储类型可以扩展到自定义对象
  3.本地数据库

  不管是属性列表还是归档，都是将数据保存到后台，前端任意一个界面都能访问
  */

 - (void)viewDidLoad {
     [super viewDidLoad];
     /*
      归档 - 本地化数据模型
      <NSCoding> - 要对哪个类的对象进行归档，就让哪个类实现这个协议
      */
     self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];
     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(changeView)];
     [self.view addGestureRecognizer:tap];

     BWLoginDataModel *loginModel = [[BWLoginDataModel alloc] init];
     loginModel.name = @"";
     loginModel.password = @"";

     //沙盒路径 - 每一个应用都有自己的沙盒，IOS机制
     NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[] stringByAppendingPathComponent:@"account.data"];
     //NSLog(@"%@",filePath);

     //将一个归档对象归档到目录下
     if ([NSKeyedArchiver archiveRootObject:loginModel toFile:filePath]) {
         NSLog(@"归档成功");
     }
     else
         NSLog(@"归档失败");

 }

 - (void)changeView
 {
     BWSecondViewController *secondVC = [[BWSecondViewController alloc] init];

     [self presentViewController:secondVC animated:YES completion:nil];
 }

 #pragma mark - 属性列表基础
 - (void)useUserDefault
 {
     /*
      //属性列表NSUserDefault(全局唯一，不用创建)

      某些数据当存储本地之后，下次再次调用的时候，不用再次重新赋值，而是从本地直接获取
      如果没有必要，别向属性列表存储大量数据
      一般用来存储简单的全局都能使用到的数据
      e.g. DeviceToken 设备令牌
      SessionID   安全口令
      ps:属性列表的存储和读取速度都是及时的，而归档和数据库都是有存储延时的
      pss：自动登录
      把用户的账号，密码存储到属性列表中

      */
     //    NSString *str = @"bowen";
     //    [[NSUserDefaults standardUserDefaults] setObject:str forKey:@"sister"];
     //    NSString *newStr = [[NSUserDefaults standardUserDefaults] objectForKey:@"sister"];
     //    NSLog(@"%@",newStr);
     //    NSLog(@"%@",[[NSUserDefaults standardUserDefaults] dictionaryRepresentation]);

     //注意别删除错了
     //[[NSUserDefaults standardUserDefaults] removeObjectForKey:@"sister"];
     //NSLog(@"%@",newStr);

 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end

 //
 //  BWSecondViewController.m
 //  IOS_0113_本地存储
 //
 //  Created by ma c on 16/1/13.
 //  Copyright (c) 2016年 博文科技. All rights reserved.
 //

 #import "BWSecondViewController.h"
 #import "BWLoginDataModel.h"

 @interface BWSecondViewController ()

 @end

 @implementation BWSecondViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     self.view.backgroundColor = [UIColor cyanColor];

     //解档
     NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[] stringByAppendingPathComponent:@"account.data"];
     BWLoginDataModel *dataModel = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
     NSLog(@"%@",dataModel);
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end

 //
 //  BWLoginDataModel.h
 //  IOS_0113_本地存储
 //
 //  Created by ma c on 16/1/13.
 //  Copyright (c) 2016年 博文科技. All rights reserved.
 //

 #import <Foundation/Foundation.h>

 @interface BWLoginDataModel : NSObject<NSCoding>

 @property (nonatomic, copy) NSString *name;
 @property (nonatomic, copy) NSString *password;

 @end

 //
 //  BWLoginDataModel.m
 //  IOS_0113_本地存储
 //
 //  Created by ma c on 16/1/13.
 //  Copyright (c) 2016年 博文科技. All rights reserved.
 //

 #import "BWLoginDataModel.h"

 @implementation BWLoginDataModel

 - (NSString *)description
 {
     return [NSString stringWithFormat:@"name:%@ password:%@", self.name,self.password];
 }

 #pragma mark - 归档方法
 - (void)encodeWithCoder:(NSCoder *)aCoder
 {
     //按照规定的Key对属性进行编码操作
     [aCoder encodeObject:self.name forKey:@"name"];
     [aCoder encodeObject:self.password forKey:@"password"];

 }
 #pragma mark - 解档方法
 - (id)initWithCoder:(NSCoder *)aDecoder
 {
     self = [super init];
     if (self) {
         //归档和解档的key可以随意写，但他们属性对应的key必须相同
         _name = [aDecoder decodeObjectForKey:@"name"];
         _password = [aDecoder decodeObjectForKey:@"password"];
     }
     return self;
 }

 @end