NSKeyedArchiver在linux的实现默认的格式是二进制：

NSArray *ary = @[@"hello",@"world",@"!!!",@11];[NSKeyedArchiver archiveRootObject:ary toFile:@"./foo.dat"];

我们还可以选择XML格式：

NSMutableData *data = [NSMutableData data];        NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]             initForWritingWithMutableData:data];//The available formats are NSPropertyListXMLFormat_v1_0 and NSPropertyListBinaryFormat_v1_0        archiver.outputFormat = NSPropertyListXMLFormat_v1_0;        [archiver encodeObject:ary forKey:@"root"];        [archiver finishEncoding];        [data writeToFile:@"./foo.dat" atomically:YES];