NSArray数据归档/解档/写入/读取

//准备写入的文件路径:/Documents/archiver(文件名)
    NSString *documentPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
    NSString *filePath = [documentPath stringByAppendingPathComponent:@"archiver"];
    //归档步骤
    NSArray *array = @[@"Jack", @19, @[@"Swift", @"Ruby", @"Perl"]];
    //1.准备一个可变数据类型
    NSMutableData *mutableData = [NSMutableData data];
    //2.创建NSKeyedArchiver对象
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:mutableData];
    //3.对数据进行编码
    [archiver encodeObject:array forKey:@"arrayKey"];
    //4.执行完成编码
    [archiver finishEncoding];
    //5.写入文件
    [mutableData writeToFile:filePath atomically:YES];
    //归档变相执行如下步骤：NSArray转成NSData写入文件
    
    
    //解档步骤
    //1.从指定的文件读取数据(NSData从文件中读取)
    NSData *readData = [NSData dataWithContentsOfFile:filePath];
    //2.创建NSKeyedUnarchiver对象
    NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:readData];
    //3.对数据进行解码
    NSArray *readArray = [unarchiver decodeObjectForKey:@"arrayKey"];
    //4.执行完成解码
    [unarchiver finishDecoding];
    //5.验证数据
    //解档变相执行的操作：NSData转成NSArray
    NSLog(@"%@",readArray);