iOS 解档归档

【归档步骤】

1.需要归档的数据结构中，任何对象都必须遵从归档协议NSCoding.实现相关方法

- (void)encodeWithCoder:(NSCoder *)aCoder;

- (id)initWithCoder:(NSCoder *)aDecoder;

2.使用KeyedAchiever进行归档

关于协议的实现

#pragma mark 归档方法

-(void)encodeWithCoder:(NSCoder *)aCoder{

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

    [aCoder encodeObject:self.IDforKey:@"ID"];

    [aCoder encodeObject:[NSNumbernumberWithInt:self.age]forKey:@"age"];

}

#pragma mark 解档方法

-(id)initWithCoder:(NSCoder *)aDecoder{

    if (self = [superinit]) {

        self.name = [aDecoderdecodeObjectForKey:@"name"];

        self.ID = [aDecoderdecodeObjectForKey:@"ID"];

        self.age = [[aDecoderdecodeObjectForKey:@"age"]intValue];

    }

    returnself;

}

//归档操作

NSMutableData *data = [[NSMutableData alloc] init];

NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];

[archiver encodeObject:school forKey:@"school"];

[archiver finishEncoding];

[data writeToFile:PATH atomically:YES];

【解归档步骤】

1.首先要确定你拥有同样的数据结构

2.使用KeyedUnAchiever进行解归档

//解档操作

NSData *data = [[NSDataalloc]initWithContentsOfFile:PATH];

NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiveralloc]initForReadingWithData:data];

School *school = [unarchiverdecodeObjectForKey:@"school"];

[unarchiver finishDecoding];

[school showStudents];