归档解档步骤：
1、遵循协议：<NSCoding>
2、实现编码解码这两个方法
// 编码(对象 -> 二进制)：告诉系统，归档时，保存哪些属性
-(void)encodeWithCoder:(NSCoder *)aCoder {}
// 解码(二进制 -> 对象)：告诉系统，解档时，初始化那些属性
-(nullable instancetype)initWithCoder:(NSCoder *)aDecoder {
3、调用归档解档方法
// 2. 实现<NSCoding>协议的encodeWithCoder:方法，告诉系统保存哪些属性
[NSKeyedArchiver archiveRootObject:person toFile:filePath];
// 2.解档
GEPerson *person = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
/*********** *********** GEPerson *********** ***********/
// GEPerson.h
// 归档解档
// 1.遵循协议
// 2.实现编码解码这两个方法
#import <Foundation/Foundation.h>
#import "GEComputer.h"
// 1.遵循协议
@interface GEPerson : NSObject <NSCoding>
@property (nonatomic,copy) NSString *name;
@property (nonatomic,assign) NSInteger age;
@property (nonatomic,strong) GEComputer *computer;
@end
// GEPerson.m
// 归档解档
#import "GEPerson.h"
@implementation GEPerson
// 2.实现编码解码这两个方法
// 编码(对象 -> 二进制)：告诉系统，归档时，保存哪些属性
- (void)encodeWithCoder:(NSCoder *)aCoder {
[aCoder encodeObject:_name forKey:@"name"];
[aCoder encodeInteger:_age forKey:@"age"];
[aCoder encodeObject:_computer forKey:@"computer"];
}
// 解码(二进制 -> 对象)：告诉系统，解档时，初始化那些属性
- (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
// 归档解档
#import <Foundation/Foundation.h>
@interface GEComputer : NSObject<NSCoding>
@property (nonatomic,copy) NSString *systemName;
@end
// GEComputer.m
// 归档解档
#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
// 归档解档
#import "ViewController.h"
#import "GEPerson.h"
#import "GEComputer.h"
@interface ViewController ()
@end
@implementation ViewController
/**
归档：保存自定义的数据类型
*/
- (void)viewDidLoad {
[super viewDidLoad];
// 打印沙盒路径
NSLog(@"沙盒路径：%@",NSHomeDirectory());
// 归档
[self saveData];
// 解档
[self readData];
}
// 归档
-(void)saveData {
// 1.创建自定义的对象
GEComputer *computer = [GEComputer new];
computer.systemName = @"Mac OS";
GEPerson *person = [GEPerson new];
person.name = @"Jack";
person.age = 18;
person.computer = computer;
// 2.归档
// 2.1 拼接文件路径
NSString *documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *filePath = [documents stringByAppendingPathComponent:@"person.data"];
// 2.2 实现<NSCoding>协议的encodeWithCoder:方法，告诉系统保存哪些属性
[NSKeyedArchiver archiveRootObject:person toFile:filePath];
}
// 解档
-(void)readData {
// 1.获取文件路径
NSString *documents = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *filePath = [documents stringByAppendingPathComponent:@"person.data"];
// 2.解档
GEPerson *person = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
NSLog(@"解档: 名字 = %@，年龄 = %ld，电脑系统 = %@",person.name,person.age,person.computer.systemName);
}
@end
