iOS 解归档

遵循NSCoding协议的类可以被序列化和反序列化。
实现两个方法： -initWithCoder: 和 encodeWithCoder:。

新建Person类，实现协议方法

#import <Foundation/Foundation.h>

@interface Person : NSObject<NSCoding>   // 遵守NSCoding协议

@property (nonatomic, copy) NSString *name;
@property (nonatomic, assign) NSInteger age;

@end

#import "Person.h"

@implementation Model
// 实现归档归档
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super init];
    if (self) {
        [aDecoder encodeObject:self.name forKey:@"name"];
        [aDecoder encodeObject:self.age forKey:@"age"];
    }
    return self;
}
// 实现解档
- (void)encodeWithCoder:(NSCoder *)aCoder {
    [aCoder decodeObjectForKey:"name"];
    [aCoder decodeObjectForKey:@"age"];
}

开始归档

// 归档地址
NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)] firstObject];
NSString *fullPath = [path stringByAppendingPathComponent:path];
// 需要归档的对象
Person *p = [Person alloc] init];
p.name = @"apple";
p.age = 12;
// 开始归档
BOOL success = [NSKeyedArchiver archiveRootObject:p toFile:fullPath];
//这两句等于上面一句
// NSData *data = [NSKeyedArchiver archivedDataWithRootObject:p];
// [data writeToFile:fullPath atomically:YES];
if (success) {
NSLog(@"归档成功");
} else {
NSLog(@"归档失败");
}

// 解档
Person *person = [NSKeyedUnarchiver unarchiveObjectWithFile:fullPath];