初级数据持久化NSKeyedArchiver（二）

看代码：

#import "MainViewController.h"
#import "Student.h"

@interface MainViewController ()

@end

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    
    Student *student = [[Student alloc]initWithName:@"安妮" Sex:@"女" HP:1800];
    
    
    

    
#pragma mark --归档(序列化)
    
    //归档
    //1.创建NSMUTableData
    NSMutableData *data = [NSMutableData data];
    
    //2.创建一个归档对象
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data];
    
    //3.用归档对象将自定义类的对象转化成二进制数据流（NSData）
    [archiver encodeObject:student forKey:@"student"];
    
    //4.归档完成
    [archiver finishEncoding];
    
    //5.归档完成之后写入本地
    
    NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    
//    //直接写入路劲
//    [NSKeyedArchiver archiveRootObject:student toFile:[documentsPath stringByAppendingPathComponent:@"student.mp3"]];

    NSString *studentPath = [documentsPath stringByAppendingPathComponent:@"student.txt"];
    
    [data writeToFile:studentPath atomically:YES];
    
    NSLog(@"%@",studentPath);
    

    
    
    
    
#pragma mark --反归档（反序列化）
    
    //1.获取存进去的二进制文件
    NSMutableData *unData = [[NSMutableData alloc]initWithContentsOfFile:studentPath];
    
    //2.创建反归档对象
    NSKeyedUnarchiver *unArchiver = [[NSKeyedUnarchiver alloc]initForReadingWithData:unData];
    
    //3.将二进制文件转化为OC对象
    
    Student *stu = [unArchiver decodeObjectForKey:@"student"];
    
    NSLog(@"%@",stu.name);
    
    [unArchiver finishDecoding];
    
    
}

model类里面怎么写了？继续看下去

#import <Foundation/Foundation.h>

//必须签订协议
@interface Student : NSObject<NSCoding>

@property (nonatomic,retain) NSString *name ;

@property (nonatomic,retain) NSString *sex ;

@property (nonatomic,assign) int HP ;

-(instancetype)initWithName:(NSString *)name Sex:(NSString *)sex HP:(int)HP ;


**********************************************

#import "Student.h"

@implementation Student

-(void)dealloc{
    [_name release];
    [_sex release];
    [super dealloc];
}


#pragma mark --解压过程
-(id)initWithCoder:(NSCoder *)aDecoder{
    self = [super init] ;
    if (self) {
        self.name = [aDecoder decodeObjectForKey:@"name"];
        self.sex = [aDecoder decodeObjectForKey:@"sex"] ;
        self.HP = [aDecoder decodeIntForKey:@"HP"] ;
    }
    
    
    return self ;
}

#pragma  mark --压缩过程
-(void)encodeWithCoder:(NSCoder *)aCoder{
    
    //转化的是自身的属性，压缩过程
    [aCoder encodeObject:self.name forKey:@"name"] ;
    [aCoder encodeObject:self.sex forKey:@"sex"] ;
    [aCoder encodeInt:self.HP forKey:@"HP"] ;
    
    
}




-(instancetype)initWithName:(NSString *)name Sex:(NSString *)sex HP:(int)HP{
    
    if (self = [super init]) {
        self.name = name ;
        self.sex = sex ;
        self.HP = HP ;
    }
    
    return self ;
    
    
}