数据存储（归档）

1.控制器中存取方法

#import "ViewController.h"

#import "dog.h"

 

@interface ViewController ()

 

@end

 

@implementation ViewController

 

//存数据

- (IBAction)writeDataAction:(UIButton *)sender {

    //1.获取存储的路径

    NSString *documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

    

    NSString *filePath = [documents stringByAppendingPathComponent:@"data.plist"];

    

    //2.创建对象

    dog *superDog = [[dog  alloc]init];

    superDog.name = @"旺财";

    superDog.age = 18;

    superDog.isTrue = YES;

    

    

    //3.归档  NSKeyedArchive

    //如果使用归档 ,所归档的对象 必须遵守NSCoding 协议, 编码协议

    [NSKeyedArchiver archiveRootObject:superDog toFile:filePath];

    

    

    

  

 

    

    

    

    

     NSLog(@"%@",filePath);

}

 

//读取数据

- (IBAction)readDataAction:(UIButton *)sender {

    

    

 

    //1.获取存储的路径

    NSString *documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

    

    NSString *filePath = [documents stringByAppendingPathComponent:@"data.plist"];

    

    

    

    //取出存储的对象

    

  dog *superDog =   [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];

 

    

    NSLog(@"%@今年%@岁了??? === %@",superDog.name,@(superDog.age),@(superDog.isTrue));

    

   

    

 

}

2.dog.h类中遵循NSCoding协议

3.dog.m类中遵循协议方法

#import "dog.h"

 

@implementation dog

 

//归档只是一个过程  告诉系统 你想存储狗的哪些属性

- (void)encodeWithCoder:(NSCoder *)aCoder

{

 

    [aCoder encodeObject:self.name forKey:@"name"];

    [aCoder encodeInteger:self.age forKey:@"age"];

    [aCoder encodeBool:self.isTrue forKey:@"isTrue"];

    

}

//反归档也是一个过程, 告诉系统你想让 别人获取 该对象的哪些属性

- (instancetype)initWithCoder:(NSCoder *)aDecoder

{

 

    if (self = [super init]) {

        

        self.name = [aDecoder decodeObjectForKey:@"name"];

        self.age = [aDecoder  decodeIntegerForKey:@"age"];

        self.isTrue = [aDecoder decodeBoolForKey:@"isTrue"];

        

    }

    return self;

}

@end