您可以通过setBucketVersioning设置桶的多版本状态。OBS中的桶支持两种多版本状态：

以下代码展示了如何设置桶的多版本状态：

static OBSClient *client;NSString *endPoint = @"your-endpoint";// 认证用的ak和sk硬编码到代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全；本示例以ak和sk保存在环境变量中为例，运行本示例前请先在本地环境中设置环境变量AccessKeyID和SecretAccessKey。// 您可以登录访问管理控制台获取访问密钥AK/SK，获取方式请参见https://support.huaweicloud.com/usermanual-ca/ca_01_0003.htmlchar* ak_env = getenv("AccessKeyID");char* sk_env = getenv("SecretAccessKey");NSString *AK = [NSString stringWithUTF8String:ak_env];NSString *SK = [NSString stringWithUTF8String:sk_env];    // 初始化身份验证OBSStaticCredentialProvider *credentialProvider = [[OBSStaticCredentialProvider alloc] initWithAccessKey:AK secretKey:SK];    //初始化服务配置OBSServiceConfiguration *conf = [[OBSServiceConfiguration alloc] initWithURLString:endPoint credentialProvider:credentialProvider];    // 初始化clientclient = [[OBSClient alloc] initWithConfiguration:conf];    // 配置桶多版本OBSBucketVersioningConfiguration *conf1 = [OBSBucketVersioningConfiguration new];    conf1.status = OBSVersioningStatusEnabled;// 设置桶多版本OBSSetBucketVersioningRequest *request = [[OBSSetBucketVersioningRequest alloc] initWithBucketName:@"bucketname" configuration: conf];[client setBucketVersioning:request completionHandler:^(OBSSetBucketVersioningResponse *response, NSError *error) {    NSLog(@"%@",response);}];