04-アーカイブのアーカイブ解除

アーカイブ解除手順:

1、プロトコルに従う:2、符号化復号を実現する2つの方法//符号化(オブジェクト->バイナリ):システムに、アーカイブ時に保存する属性-(void)encodeWithCoder:(NSCoder*)aCoder{}//復号(バイナリ->オブジェクト):システムに、アーカイブ時にそれらの属性-(nullable instancetype)initWithCoder:(NSCoder*)aDecoder{
3、アーカイブのアーカイブ解除方法//2を呼び出す.プロトコルを実装するencodeWithCoder:メソッドは、どのプロパティを保存するかを教えます[NSKeydArchiver archiveRootObject:person toFile:filePath];//2.アーカイブGEPerson*person=[NSKeydUnarchiver unarchiveObjectWithFile:filePath];

/*********** *********** GEPerson *********** ***********/
//  GEPerson.h
//   
// 1. 
// 2. 

#import 
#import "GEComputer.h"

// 1. 
@interface GEPerson : NSObject 
@property (nonatomic,copy) NSString *name;
@property (nonatomic,assign) NSInteger age;
@property (nonatomic,strong) GEComputer *computer;
@end

//  GEPerson.m
//   

#import "GEPerson.h"

@implementation GEPerson
// 2. 
//  (  ->  )： ， ， 
- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder encodeObject:_name forKey:@"name"];
    [aCoder encodeInteger:_age forKey:@"age"];
    [aCoder encodeObject:_computer forKey:@"computer"];
}
//  (  ->  )： ， ， 
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
    if (self = [super init]) {
        _name = [aDecoder decodeObjectForKey:@"name"];
        _age = [aDecoder decodeIntegerForKey:@"age"];
        _computer = [aDecoder decodeObjectForKey:@"computer"];
    }
    return self;
}
@end

/*********** *********** GEComputer *********** ***********/
//  GEComputer.h
//   

#import 

@interface GEComputer : NSObject
@property (nonatomic,copy) NSString *systemName;
@end

//  GEComputer.m
//   

#import "GEComputer.h"

@implementation GEComputer
-(void)encodeWithCoder:(NSCoder *)aCoder{
    [aCoder encodeObject:_systemName forKey:@"systemName"];
}
-(instancetype)initWithCoder:(NSCoder *)aDecoder{
    if (self = [super init]) {
        _systemName = [aDecoder decodeObjectForKey:@"systemName"];
    }
    return self;
}
@end

/*********** *********** ViewController *********** ***********/
//  ViewController.m
//   

#import "ViewController.h"
#import "GEPerson.h"
#import "GEComputer.h"

@interface ViewController ()
@end

@implementation ViewController

/**
  ： 
 */
- (void)viewDidLoad {
    [super viewDidLoad];
    //  
    NSLog(@" ：%@",NSHomeDirectory());
    //  
    [self saveData];
    //  
    [self readData];
}

//  
-(void)saveData {
    // 1. 
    GEComputer *computer = [GEComputer new];
    computer.systemName = @"Mac OS";
    
    GEPerson *person = [GEPerson new];
    person.name = @"Jack";
    person.age = 18;
    person.computer = computer;
    
    // 2. 
    // 2.1  
    NSString *documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSString *filePath = [documents stringByAppendingPathComponent:@"person.data"];
    
    // 2.2   encodeWithCoder: ， 
    [NSKeyedArchiver archiveRootObject:person toFile:filePath];
}

//  
-(void)readData {
    // 1. 
    NSString *documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSString *filePath = [documents stringByAppendingPathComponent:@"person.data"];
    
    // 2. 
    GEPerson *person = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
    
    NSLog(@" :   = %@，  = %ld，  = %@",person.name,person.age,person.computer.systemName);
}
@end