桶（Bucket）是TOS的全局唯一的命名空间，相当于数据的容器，用来储存对象（Object）数据。新创建的桶名在 TOS 中必须是唯一的。
如下代码展示如何创建一个新桶。
// 从STS服务获取的临时访问密钥和安全令牌（AccessKey、SecretKey、SecurityToken） TOSCredential *credential = [[TOSCredential alloc] initWithAccessKey:@"accesskey" secretKey:@"secretkey" securityToken:@"securityToken"]; TOSEndpoint *tosEndpoint = [[TOSEndpoint alloc] initWithURLString:@"endpoint" withRegion:@"region"]; TOSClientConfiguration *config = [[TOSClientConfiguration alloc] initWithEndpoint:tosEndpoint credential:credential]; TOSClient *client = [[TOSClient alloc] initWithConfiguration:config]; TOSCreateBucketInput *create = [TOSCreateBucketInput new]; create.tosBucket = @"bucket-name"; create.tosAcl = TOSACLPublicRead; TOSTask *task = [client createBucket:create]; [task continueWithBlock:^id _Nullable(TOSTask * _Nonnull task) { if (!task.error) { NSLog(@"Create bucket success."); TOSCreateBucketOutput *output = task.result; } else { NSLog(@"Create bucket failed, error: %@.", task.error); } return nil; }];