复杂对象的本地化（以Person为例）

Person.h

 1 #import <Foundation/Foundation.h>
 2
 3 @interface Person : NSObject <NSCoding>
 4
 5 /// 姓名
 6 @property (nonatomic, copy) NSString *name;
 7
 8 /// 性别
 9 @property (nonatomic, copy) NSString *gender;
10
11 /// 年龄
12 @property (nonatomic, assign) NSInteger age;
13
14 @end

Person.m

 1 #import "Person.h"
 2
 3 @implementation Person
 4
 5 // 归档
 6 // 将所有属性进行归档
 7 - (void)encodeWithCoder:(NSCoder *)aCoder {
 8
 9     [aCoder encodeObject:self.name forKey:@"name"];
10     [aCoder encodeObject:self.gender forKey:@"gender"];
11     [aCoder encodeInteger:self.age forKey:@"age"];
12 }
13
14 // 解档
15 - (instancetype)initWithCoder:(NSCoder *)aDecoder {
16
17     self = [super init];
18     if (self) {
19         self.name = [aDecoder decodeObjectForKey:@"name"];
20         self.gender = [aDecoder decodeObjectForKey:@"gender"];
21         self.age = [aDecoder decodeIntegerForKey:@"age"];
22     }
23     return self;
24 }
25
26 @end

ViewController.m

 1 #import "ViewController.h"
 2 #import "Person.h"
 3
 4 @interface ViewController ()
 5
 6 @end
 7
 8 @implementation ViewController
 9
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12
13     // 如果把一个Person类型的对象存入本地，这个对象必须遵守NSCoding协议，实现协议中的两个方法
14
15 #pragma mark - 复杂对象的本地化
16
17     // 1.找到Documents文件夹的目录
18     NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
19
20     // 2.创建Person对象
21     Person *person = [[Person alloc] init];
22     person.name = @"卫庄";
23     person.gender = @"男";
24     person.age = 18;
25
26     // 3.把这些复杂对象归档并存储
27     // 3.1 创建NSMutableData，用于初始化归档工具
28     NSMutableData *data = [NSMutableData data];
29     // 3.2 创建归档工具
30     NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
31     // 3.3 对需要归档的对象进行归档
32     [archiver encodeObject:person forKey:@"person"];
33     // 3.4 结束归档
34     [archiver finishEncoding];
35 //    NSLog(@"%@", data);
36
37     // 4.将归档的内容NSMutableData存储到本地
38     NSString *personPath = [documentPath stringByAppendingPathComponent:@"person.plist"];
39     [data writeToFile:personPath atomically:YES];
40     NSLog(@"%@", personPath);
41
42
43 #pragma mark - 解档
44
45     // 1.将要解档的数据找出来
46     NSData *resultData = [NSData dataWithContentsOfFile:personPath];
47
48     // 2.创建解档工具
49     NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:resultData];
50
51     // 3.对Person对象进行解档(要使用对象去接收)
52     Person *newPerson = [unarchiver decodeObjectForKey:@"person"];
53
54     // 4.结束解档
55     [unarchiver finishDecoding];
56     NSLog(@"name = %@, gender = %@, age = %ld", newPerson.name, newPerson.gender, newPerson.age);
57
58 }
59
60 @end