对于较大的对象，可以分成多个数据块（part）来分别上传，最后调用CompleteMultipartUpload来把上传的数据块合并为一个对象。
您可以通过以下步骤分片上传对象：
如下代码展示如何通过分片接口分片上传一个对象。
// 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]; // 1. CreateMultipartUpload TOSCreateMultipartUploadInput *create = [TOSCreateMultipartUploadInput new]; create.tosBucket = @"bucket-name"; create.tosKey = @"object-name"; TOSTask *task = [client createMultipartUpload:create]; [task waitUntilFinished]; TOSCreateMultipartUploadOutput *createOutput = task.result; // 2. UploadPart NSMutableArray *uploadedParts = [NSMutableArray array]; for (int i = 1; i <= your_chunck_count; i++) { TOSUploadPartInput *upload = [TOSUploadPartInput new]; upload.tosKey = createOutput.key; upload.tosBucket = createOutput.bucket; upload.tosUploadId = createOutput.uploadId; upload.tosPartNumber = i; upload.tosContent = your_chunck_data; task = [client uploadPart:upload]; [task waitUntilFinished]; TOSUploadPartOutput *uploadOutput = task.result; // 保存ETag和PartNumber TOSUploadedPart *uploadedPart = [TOSUploadedPart new]; uploadedPart.tosETag = uploadOutput.tosETag; // 注意处理首尾\" uploadedPart.tosPartNumber = uploadOutput.tosPartNumber; [uploadedParts addObject:uploadedPart]; } // 3. CompleteMultipartUpload TOSCompleteMultipartUploadInput *complete = [TOSCompleteMultipartUploadInput new]; complete.tosBucket = createOutput.bucket; complete.toKey = createOutput.key; complete.tosUploadId = createOutput.uploadId; complete.tosParts = uploadedParts; // 根据保存的ETag和PartNumber构建 task = [client completeMultipartUpload:complete]; [task continueWithBlock:^id(TOSTask *task) { if (!task.error) { TOSCompleteMultipartUploadOutput *completeOutput = task.result; } else { } return nil; }];