# 设置桶标签
您可以通过setBucketTagging设置桶标签。以下代码展示了如何设置桶标签：
```
static OBSClient *client;
NSString *endPoint = @"https://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.html
char* ak_env = getenv("AccessKeyID");
char* sk_env = getenv("SecretAccessKey");
if (ak_env == NULL || sk_env == NULL) {
    NSLog(@"Error: AccessKeyID or SecretAccessKey environment variable not set");
    return;
}
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client
client = [[OBSClient alloc] initWithConfiguration:conf];
    
// 设置桶标签
OBSSetBucketTaggingRequest *request = [[OBSSetBucketTaggingRequest alloc]initWithBucketName:@"bucketname"];
[request.tagList addObject:[[OBSBucketTag alloc]initWithKey:@"tagkey" value:@"tagvalue"]];
[request.tagList addObject:[[OBSBucketTag alloc]initWithKey:@"tagkey1" value:@"tagvalue1"]];
    
[client setBucketTagging:request completionHandler:^(OBSSetBucketTaggingResponse *response, NSError *error){
    NSLog(@"%@",response);
 }];
```
![](https://support.huaweicloud.com/sdk-ios-devg-obs/public_sys-resources/note_3.0-zh-cn.png)
- 每个桶支持最多10个标签。
- 标签的key和value支持unicode。