1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3     //定义字符串张三
 4     NSString * str = @"张三";
 5     //存储张三
 6     [[NSUserDefaults standardUserDefaults] setObject:str forKey:@"zhangsan"];
 7     //创建对象李四
 8     Lisi * lisi = [[Lisi alloc]init];
 9     //给李四名字赋值
10     lisi.name = @"李四";
11     //这里使用了李明杰老师的第三方框架,因为 NSUserDefaults 存储类型有限制,不能存储模型
12     NSMutableDictionary * dict = [lisi mj_keyValues];
13     //存储李四
14     [[NSUserDefaults standardUserDefaults] setObject:dict forKey:@"lisi"];
15 }
16
17 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
18     //读取数据
19     id person1 = [[NSUserDefaults standardUserDefaults] objectForKey:@"zhangsan"];
20     id person2 = [[NSUserDefaults standardUserDefaults] objectForKey:@"lisi"];
21     //其实我们知道person1 是个字符串 , person2是个字典
22     NSLog(@"person1=%@ person2=%@",((NSString *)person1),[((NSMutableDictionary *)person2) objectForKey:@"name"]);
23 }

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3     /**
 4      这里需要注意一下.持久化储存路径分为Documents,Library,Temp三个文件夹
 5      Documents文件夹会备份
 6      Library文件夹中的Preferences文件夹也会被备份.Caches文件夹不会被备份
 7      Tmp是临时文件,一般不往这个文件夹做持久化,这个文件夹会被系统自动清理
 8      */
 9     //我这里选择不会备份的Caches文件夹作为存储地址
10     NSString * caches = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;
11     zhangsanFilePath = [caches stringByAppendingPathComponent:@"zhangsan"];
12     //输出文件夹路径
13     NSLog(@"caches=%@",caches);
14
15     NSString * str = @"张三";
16     NSError * error;
17     [str writeToFile:zhangsanFilePath atomically:YES encoding:NSUTF8StringEncoding error:&error];
18     if (error) NSLog(@"error = %@",error);
19
20     //创建对象李四
21     Lisi * lisi = [[Lisi alloc]init];
22     //给李四名字赋值
23     lisi.name = @"李四";
24     //这里使用了李明杰老师的第三方框架,因为模型是没有writeToFile方法.
25     NSMutableDictionary * dict = [lisi mj_keyValues];
26     lisifilePath = [caches stringByAppendingPathComponent:@"lisi"];
27     [dict writeToFile:lisifilePath atomically:YES];
28 }
29
30 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
31     //读数据
32     //因为你知道存储类型,所以读数据用类方法
33     NSString * zhangsan = [NSString stringWithContentsOfFile:zhangsanFilePath encoding:NSUTF8StringEncoding error:nil];
34     NSLog(@"zhangsan=%@",zhangsan);
35
36     NSDictionary * lisi = [NSDictionary dictionaryWithContentsOfFile:lisifilePath];
37     NSLog(@"lisi=%@",[lisi objectForKey:@"name"]);
38 }

 1 //归档
 2 - (void)encodeWithCoder:(NSCoder *)aCoder {
 3     [aCoder encodeObject:_name forKey:@"NAME"];
 4 }
 5 //解档
 6 - (instancetype)initWithCoder:(NSCoder *)aDecoder {
 7     self = [super init];
 8     if (self) {
 9         _name = [aDecoder decodeObjectForKey:@"NAME"];
10     }
11     return self;
12 }

 1 - (void)viewDidLoad {
 2     [super viewDidLoad];
 3
 4     NSString * caches = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;
 5     NSLog(@"caches=%@",caches);
 6     lisifilePath = [caches stringByAppendingPathComponent:@"lisi"];
 7
 8     Lisi * lisi = [[Lisi alloc]init];
 9     lisi.name = @"李四";
10     //归档
11     BOOL isSuccess = [NSKeyedArchiver archiveRootObject:lisi toFile:lisifilePath];
12     if (isSuccess) NSLog(@"success");
13
14 }
15
16 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
17     //解档
18     Lisi * lisi = [NSKeyedUnarchiver unarchiveObjectWithFile:lisifilePath];
19     NSLog(@"lisi=%@",lisi.name);
20 }