基本数据持久化：把OC中的基本数据存储到沙盒中。
归档：把复杂类型转为data类型的过程。
解归档：把data类型转为复杂类型的过程。
NSCoding
//======car.h========
#import <Foundation/Foundation.h>
@interface YTCar : NSObject <NSCoding>
//颜色
@property(nonatomic, copy) NSString * color;
//价格
@property(nonatomic, assign) double price;
@end
//========car.m==========
#import "YTCar.h"
@implementation YTCar
//将所有属性归档
- (void)encodeWithCoder:(NSCoder *)aCoder{
[aCoder encodeObject:_color forKey:@"color"];
[aCoder encodeDouble:_price forKey:@"price"];
}
//将所有属性解归档
- (id)initWithCoder:(NSCoder *)aDecoder{
if (self = [super init]) {
_color = [aDecoder decodeObjectForKey:@"color"];
_price = [aDecoder decodeDoubleForKey:@"price"];
}
return self;
}
@end
#import <Foundation/Foundation.h>
@class YTCar;
@interface YTPerson : NSObject <NSCoding>
//姓名
@property(nonatomic, copy) NSString * name;
//车
@property(nonatomic, strong) YTCar * car;
@end
//=======preson.m========
#import "YTPerson.h"
#import "YTCar.h"
@implementation YTPerson
//将所有希望归档的属性都归档
- (void)encodeWithCoder:(NSCoder *)aCoder{
[aCoder encodeObject:_name forKey:@"name"];
[aCoder encodeObject:_car forKey:@"car"];
}
//解归档
- (id)initWithCoder:(NSCoder *)aDecoder{
if (self = [super init]) {
_name = [aDecoder decodeObjectForKey:@"name"];
_car = [aDecoder decodeObjectForKey:@"car"];
}
return self;
}
@end
//=====main========
#import <Foundation/Foundation.h>
#import "YTPerson.h"
#import "YTCar.h"
#define PATH @"/Users/yuting/Desktop/授课/CD1601/OC阶段/day5-归档和解归档/Person"
//如果需要归档的对象的属性中有另外一个类的对象，让两个类都遵守NSCoding协议并且实现协议方法，去归档和解归档相应的属性。
int main(int argc, const char * argv[]) {
@autoreleasepool {
YTPerson * person = [[YTPerson alloc] init];
person.name = @"小明";
YTCar * bee = [[YTCar alloc] init];
bee.color = @"yellow";
bee.price = 50;
person.car = bee;
//归档
// [NSKeyedArchiver archiveRootObject:person toFile:PATH];
//解归档
YTPerson * p = [NSKeyedUnarchiver unarchiveObjectWithFile:PATH];
NSLog(@"%@ %@ %lf", p.name, p.car.color,p.car.price);
}
return 0;
}
