初级数据持久化NSKeyedArchiver（二）

看代码：

 1 #import "MainViewController.h"
 2 #import "Student.h"
 3
 4 @interface MainViewController ()
 5
 6 @end
 7
 8 @implementation MainViewController
 9
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12     // Do any additional setup after loading the view.
13
14
15     Student *student = [[Student alloc]initWithName:@"安妮" Sex:@"女" HP:1800];
16
17
18
19
20
21 #pragma mark --归档(序列化)
22
23     //归档
24     //1.创建NSMUTableData
25     NSMutableData *data = [NSMutableData data];
26
27     //2.创建一个归档对象
28     NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data];
29
30     //3.用归档对象将自定义类的对象转化成二进制数据流（NSData）
31     [archiver encodeObject:student forKey:@"student"];
32
33     //4.归档完成
34     [archiver finishEncoding];
35
36     //5.归档完成之后写入本地
37
38     NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
39
40 //    //直接写入路劲
41 //    [NSKeyedArchiver archiveRootObject:student toFile:[documentsPath stringByAppendingPathComponent:@"student.mp3"]];
42
43     NSString *studentPath = [documentsPath stringByAppendingPathComponent:@"student.txt"];
44
45     [data writeToFile:studentPath atomically:YES];
46
47     NSLog(@"%@",studentPath);
48
49
50
51
52
53
54 #pragma mark --反归档（反序列化）
55
56     //1.获取存进去的二进制文件
57     NSMutableData *unData = [[NSMutableData alloc]initWithContentsOfFile:studentPath];
58
59     //2.创建反归档对象
60     NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:unData];
61
62     //3.将二进制文件转化为OC对象
63
64     Student *stu = [unArchiver decodeObjectForKey:@"student"];
65
66     NSLog(@"%@",stu.name);
67
68     [unArchiver finishDecoding];
69
70
71 }

model类里面怎么写了？继续看下去

 1 #import <Foundation/Foundation.h>
 2
 3 //必须签订协议
 4 @interface Student : NSObject<NSCoding>
 5
 6 @property (nonatomic,retain) NSString *name ;
 7
 8 @property (nonatomic,retain) NSString *sex ;
 9
10 @property (nonatomic,assign) int HP ;
11
12 -(instancetype)initWithName:(NSString *)name Sex:(NSString *)sex HP:(int)HP ;
13
14
15 **********************************************
16
17 #import "Student.h"
18
19 @implementation Student
20
21 -(void)dealloc{
22     [_name release];
23     [_sex release];
24     [super dealloc];
25 }
26
27
28 #pragma mark --解压过程
29 -(id)initWithCoder:(NSCoder *)aDecoder{
30     self = [super init] ;
31     if (self) {
32         self.name = [aDecoder decodeObjectForKey:@"name"];
33         self.sex = [aDecoder decodeObjectForKey:@"sex"] ;
34         self.HP = [aDecoder decodeIntForKey:@"HP"] ;
35     }
36
37
38     return self ;
39 }
40
41 #pragma  mark --压缩过程
42 -(void)encodeWithCoder:(NSCoder *)aCoder{
43
44     //转化的是自身的属性，压缩过程
45     [aCoder encodeObject:self.name forKey:@"name"] ;
46     [aCoder encodeObject:self.sex forKey:@"sex"] ;
47     [aCoder encodeInt:self.HP forKey:@"HP"] ;
48
49
50 }
51
52
53
54
55 -(instancetype)initWithName:(NSString *)name Sex:(NSString *)sex HP:(int)HP{
56
57     if (self = [super init]) {
58         self.name = name ;
59         self.sex = sex ;
60         self.HP = HP ;
61     }
62
63     return self ;
64
65
66 }