NSKeyedUnarchiver归档

//编码
-(void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.name forKey:@"name"];
}
//解码
-(id)initWithCoder:(NSCoder *)aDecoder
{
    self=[super init];
    if (self) {
        self.name=[aDecoder decodeObjectForKey:@"name"];
    }
    return self;
}

people *p=[[people alloc]init];
    p.name=@"tom";
    NSString *path=[NSHomeDirectory() stringByAppendingPathComponent:@"Documents/1.txt"];
    //归档
    [NSKeyedArchiver archiveRootObject:p toFile:path];
    //
    people *p1=[NSKeyedUnarchiver unarchiveObjectWithFile:path];
    NSLog(@"%@",p1.name);