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。

分片上传步骤

您可以通过以下步骤分片上传对象：

通CreateMultipartUpload 初始化分片上传任务。

通过 UploadPart 进行分片上传。

通过 CompleteMultipartUpload 将所有分片合并为一个对象。

示例代码

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.tosKey;​
    upload.tosBucket = createOutput.tosBucket;​
    upload.tosUploadID = createOutput.tosUploadID;​
    upload.tosPartNumber = i;​
    upload.tosContent = your_chunck_data;​
    task = [client uploadPart:upload];​
    [task waitUntilFinished];​
    TOSUploadPartOutput *uploadOutput = task.result;​
    ​
    TOSUploadedPart *uploadedPart = [TOSUploadedPart new];​
    uploadedPart.tosETag = uploadOutput.tosETag;​
    uploadedPart.tosPartNumber = uploadOutput.tosPartNumber;​
    ​
    [uploadedParts addObject:uploadedPart];​
}​
​
// 3. CompleteMultipartUpload​
TOSCompleteMultipartUploadInput *complete = [TOSCompleteMultipartUploadInput new];​
complete.tosBucket = createOutput.tosBucket;​
complete.tosKey = createOutput.tosKey;​
complete.tosUploadID = createOutput.tosUploadID;​
complete.tosParts = uploadedParts;​
task = [client completeMultipartUpload:complete];​
[task continueWithBlock:^id(TOSTask *task) {​
    if (!task.error) {​
        TOSCompleteMultipartUploadOutput *completeOutput = task.result;​
    } else {​
    }​
    return nil;​
}];​

对象存储