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 = @"123456";
    loginModel.password = @"654321";
    
    //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)[0] 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)[0] 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