OC 數據持久化（數據本地化）- 本地存儲

 1 //
 2 //  ViewController.m
 3 //  IOS_0113_本地存儲
 4 //
 5 //  Created by ma c on 16/1/13.
 6 //  Copyright (c) 2016年 博文科技. All rights reserved.
 7 //
 8 
 9 #import "ViewController.h"
10 #import "BWLoginDataModel.h"
11 #import "BWSecondViewController.h"
12 
13 @interface ViewController ()
14 
15 @end
16 
17 @implementation ViewController
18 /*
19  數據本地化（數據持久化）- 本地存儲
20  1.NSUserDefault屬性列表存儲 - 輕量級數據，存儲類型有限
21  2.歸檔 - 大量數據，存儲類型能夠擴展到自定義對象
22  3.本地數據庫
23  
24  無論是屬性列表仍是歸檔，都是將數據保存到後臺，前端任意一個界面都能訪問
25  */
26 
27 - (void)viewDidLoad {
28     [super viewDidLoad];
29     /*
30      歸檔 - 本地化數據模型
31      <NSCoding> - 要對哪一個類的對象進行歸檔，就讓哪一個類實現這個協議
32      */
33     self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];
34     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(changeView)];
35     [self.view addGestureRecognizer:tap];
36     
37     BWLoginDataModel *loginModel = [[BWLoginDataModel alloc] init];
38     loginModel.name = @"123456";
39     loginModel.password = @"654321";
40     
41     //沙盒路徑 - 每個應用都有本身的沙盒，IOS機制
42     NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0] stringByAppendingPathComponent:@"account.data"];
43     //NSLog(@"%@",filePath);
44     
45     //將一個歸檔對象歸檔到目錄下
46     if ([NSKeyedArchiver archiveRootObject:loginModel toFile:filePath]) {
47         NSLog(@"歸檔成功");
48     }
49     else
50         NSLog(@"歸檔失敗");
51     
52 }
53 
54 - (void)changeView
55 {
56     BWSecondViewController *secondVC = [[BWSecondViewController alloc] init];
57     
58     [self presentViewController:secondVC animated:YES completion:nil];
59 }
60 
61 #pragma mark - 屬性列表基礎
62 - (void)useUserDefault
63 {
64     /*
65      //屬性列表NSUserDefault(全局惟一，不用建立)
66      
67      某些數據當存儲本地以後，下次再次調用的時候，不用再次從新賦值，而是從本地直接獲取
68      若是沒有必要，別向屬性列表存儲大量數據
69      通常用來存儲簡單的全局都能使用到的數據
70      e.g. DeviceToken 設備令牌
71      SessionID   安全口令
72      ps:屬性列表的存儲和讀取速度都是及時的，而歸檔和數據庫都是有存儲延時的
73      pss：自動登陸
74      把用戶的帳號，密碼存儲到屬性列表中
75      
76      */
77     //    NSString *str = @"bowen";
78     //    [[NSUserDefaults standardUserDefaults] setObject:str forKey:@"sister"];
79     //    NSString *newStr = [[NSUserDefaults standardUserDefaults] objectForKey:@"sister"];
80     //    NSLog(@"%@",newStr);
81     //    NSLog(@"%@",[[NSUserDefaults standardUserDefaults] dictionaryRepresentation]);
82     
83     //注意別刪除錯了
84     //[[NSUserDefaults standardUserDefaults] removeObjectForKey:@"sister"];
85     //NSLog(@"%@",newStr);
86     
87 }
88 
89 - (void)didReceiveMemoryWarning {
90     [super didReceiveMemoryWarning];
91     // Dispose of any resources that can be recreated.
92 }
93 
94 @end

 

 1 //
 2 //  BWSecondViewController.m
 3 //  IOS_0113_本地存儲
 4 //
 5 //  Created by ma c on 16/1/13.
 6 //  Copyright (c) 2016年 博文科技. All rights reserved.
 7 //
 8 
 9 #import "BWSecondViewController.h"
10 #import "BWLoginDataModel.h"
11 
12 @interface BWSecondViewController ()
13 
14 @end
15 
16 @implementation BWSecondViewController
17 
18 - (void)viewDidLoad {
19     [super viewDidLoad];
20     self.view.backgroundColor = [UIColor cyanColor];
21 
22     //解檔
23     NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0] stringByAppendingPathComponent:@"account.data"];
24     BWLoginDataModel *dataModel = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
25     NSLog(@"%@",dataModel);
26 }
27 
28 - (void)didReceiveMemoryWarning {
29     [super didReceiveMemoryWarning];
30     // Dispose of any resources that can be recreated.
31 }
32 
33 @end

 1 //
 2 //  BWLoginDataModel.h
 3 //  IOS_0113_本地存儲
 4 //
 5 //  Created by ma c on 16/1/13.
 6 //  Copyright (c) 2016年 博文科技. All rights reserved.
 7 //
 8 
 9 #import <Foundation/Foundation.h>
10 
11 @interface BWLoginDataModel : NSObject<NSCoding>
12 
13 
14 @property (nonatomic, copy) NSString *name;
15 @property (nonatomic, copy) NSString *password;
16 
17 
18 @end
19 
20 
21 //
22 //  BWLoginDataModel.m
23 //  IOS_0113_本地存儲
24 //
25 //  Created by ma c on 16/1/13.
26 //  Copyright (c) 2016年 博文科技. All rights reserved.
27 //
28 
29 #import "BWLoginDataModel.h"
30 
31 @implementation BWLoginDataModel
32 
33 - (NSString *)description
34 {
35     return [NSString stringWithFormat:@"name:%@ password:%@", self.name,self.password];
36 }
37 
38 #pragma mark - 歸檔方法
39 - (void)encodeWithCoder:(NSCoder *)aCoder
40 {
41     //按照規定的Key對屬性進行編碼操做
42     [aCoder encodeObject:self.name forKey:@"name"];
43     [aCoder encodeObject:self.password forKey:@"password"];
44     
45 }
46 #pragma mark - 解檔方法
47 - (id)initWithCoder:(NSCoder *)aDecoder
48 {
49     self = [super init];
50     if (self) {
51         //歸檔和解檔的key能夠隨意寫，但他們屬性對應的key必須相同
52         _name = [aDecoder decodeObjectForKey:@"name"];
53         _password = [aDecoder decodeObjectForKey:@"password"];
54     }
55     return self;
56 }
57 
58 @end