ios oss 自签名断点续传 操作未完成 403

我用 [font=PingFangSC, &]iOS SDK开发包(2016-12-15) 版本号 2.6.0，官方的断点续传示例，使用自签名模式认证，但是始终返回 操作未完成  server error -403的错误，同样的方式在安卓下面能成功，通过跟踪签名请求如下：
[font=PingFangSC, &] ===========下面是ios版本的日志=============
POST

image/jpeg
Mon, 22 May 2017 15:07:39 GMT
/wiz-test/abc.jpg?uploads
======OSS LTAI35TTxg9XV0KK:brScSlpByeIOJn32vFvD3T2VGWk=
GET


Mon, 22 May 2017 15:07:41 GMT
/wiz-test/abc.jpg?uploadId=4C784C746132401793182CAE35B62013
======OSS LTAI35TTxg9XV0KK:zWpO0elEaW0rQ4+25Pt3uk6Nybs=
PUT
zKsBFRoquWrlkhfHHQev0g==
image/jpeg
Mon, 22 May 2017 15:07:42 GMT
/wiz-test/abc.jpg?partNumber=1
======OSS LTAI35TTxg9XV0KK:JokCb1GGSExWCQCOwDsTJtQW3+0=
=====================下面是android版本的日志，======================================
POST

image/jpeg
Mon, 22 May 2017 15:08:33 GMT
/wiz-test/abc.jpg?uploads
======OSS LTAI35TTxg9XV0KK:m5SxoFIZj8j6fdR4IAgHH6w/ntM=
PUT
p5rBrspBOGhb0YcFOsEwLA==
image/jpeg
Mon, 22 May 2017 15:08:34 GMT
/wiz-test/abc.jpg?partNumber=1&uploadId=B0E72129E4D9494CBF384C340BE3F52F
======OSS LTAI35TTxg9XV0KK:cnSlbZUQUi9/2xtMciqYN5jxl2w=
PUT
kKU528nOw83C4IqqyVTFEg==
image/jpeg
Mon, 22 May 2017 15:08:36 GMT
/wiz-test/abc.jpg?partNumber=2&uploadId=B0E72129E4D9494CBF384C340BE3F52F
======OSS LTAI35TTxg9XV0KK:oUXxpvaBhyHMSef63XAh6/BoHj8=
POST

image/jpeg
Mon, 22 May 2017 15:08:36 GMT
/wiz-test/abc.jpg?uploadId=B0E72129E4D9494CBF384C340BE3F52F
======OSS LTAI35TTxg9XV0KK:Dd1qT/MtLo+HLLeU3CoBbXa1b5A=发现加签请求把partNumber和uploadId分成两个请求了，不像安卓版本的一样。怎么解决？
[font=PingFangSC, &] // 自签名请求
id<OSSCredentialProvider> credential = [[OSSCustomSignerCredentialProvider alloc] initWithImplementedSigner:^NSString *(NSString *contentToSign, NSError *__autoreleasing *error) {
          NSURL * url = [NSURL URLWithString:signUrl];
        //  NSURLRequest * request = [NSURLRequest requestWithURL:url];
          NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10];
          [request setHTTPMethod:@"POST"];
            [request setHTTPBody:[[@"content=" stringByAppendingString:contentToSign] dataUsingEncoding:NSUTF8StringEncoding]];

          OSSTaskCompletionSource * tcs = [OSSTaskCompletionSource taskCompletionSource];
          NSURLSession * session = [NSURLSession sharedSession];
          NSURLSessionTask * sessionTask = [session dataTaskWithRequest:request
                                            completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                    if (error) {
                                                            [tcs setError:error];
                                                            return;
                                                    }
                                                    [tcs setResult:data];
                                            }];
          [sessionTask resume];
          [tcs.task waitUntilFinished];
          if (tcs.task.error) {
                  return nil;
          } else {
                  return [[NSString alloc]initWithData:tcs.task.result encoding:NSUTF8StringEncoding];
          }
        }];
        client = [[OSSClient alloc] initWithEndpoint:endpoint credentialProvider:credential]; [[[[[[OSSTask taskWithResult:nil] continueWithBlock:^id (OSSTask *task) {
             // 为该文件构造一个唯一的记录键
             NSURL * fileURL = [NSURL fileURLWithPath:filePath];
             NSDate * lastModified;
             NSError * error;
             [fileURL getResourceValue:&lastModified forKey:NSURLContentModificationDateKey error:&error];
             if (error) {
                     return [OSSTask taskWithError:error];
             }
             recordKey = [NSString stringWithFormat:@"%@-%@-%@-%@", bucketName, objectKey, [OSSUtil getRelativePath:filePath], lastModified];
             // 通过记录键查看本地是否保存有未完成的UploadId
             NSUserDefaults * userDefault = [NSUserDefaults standardUserDefaults];
             return [OSSTask taskWithResult:[userDefault objectForKey:recordKey]];
     }] continueWithSuccessBlock:^id (OSSTask *task) {
            if (!task.result) {
                    // 如果本地尚无记录，调用初始化UploadId接口获取
                    OSSInitMultipartUploadRequest * initMultipart = [OSSInitMultipartUploadRequest new];
                    initMultipart.bucketName = bucketName;
                    initMultipart.objectKey = objectKey;
                    return [client multipartUploadInit:initMultipart];
            }
            //OSSLogVerbose(@"An resumable task for uploadid: %@", task.result);
            return task;
    }] continueWithSuccessBlock:^id (OSSTask *task) {
           NSString * uploadId = nil;

           if (task.error) {
                   return task;
           }

           if ([task.result isKindOfClass:[OSSInitMultipartUploadResult class]]) {
                   uploadId = ((OSSInitMultipartUploadResult *)task.result).uploadId;
           } else {
                   uploadId = task.result;
           }

           if (!uploadId) {
                   return [OSSTask taskWithError:[NSError errorWithDomain:OSSClientErrorDomain
                                                  code:OSSClientErrorCodeNilUploadid
                                                  userInfo:@{OSSErrorMessageTOKEN: @"Can't get an upload id"}]];
           }
           // 将“记录键：UploadId”持久化到本地存储
           NSUserDefaults * userDefault = [NSUserDefaults standardUserDefaults];
           [userDefault setObject:uploadId forKey:recordKey];
           [userDefault synchronize];
           return [OSSTask taskWithResult:uploadId];
   }] continueWithSuccessBlock:^id (OSSTask *task) {
          // 持有UploadId上传文件
          OSSResumableUploadRequest * resumableUpload = [OSSResumableUploadRequest new];
          resumableUpload.bucketName = bucketName;
          resumableUpload.objectKey = objectKey;
          resumableUpload.uploadId = task.result;
          resumableUpload.uploadingFileURL = [NSURL fileURLWithPath:filePath];
          resumableUpload.uploadProgress = ^(int64_t bytesSent, int64_t totalBytesSent, int64_t totalBytesExpectedToSend) {
            NSString *progress=[NSString stringWithFormat:@"%.2f",(float) totalBytesSent/totalBytesExpectedToSend*100];
            NSDictionary *ret = @{@"oper":@"progress", @"progress":[progress stringByAppendingString:@"%"]};
            [self sendResultEventWithCallbackId:_cbId dataDict:ret errDict:nil doDelete:NO];
          };
          return [client resumableUpload:resumableUpload];
  }] continueWithBlock:^id (OSSTask *task) {
      
         if (task.error) {
                 if ([task.error.domain isEqualToString:OSSClientErrorDomain] && task.error.code == OSSClientErrorCodeCannotResumeUpload) {
                         // 如果续传失败且无法恢复，需要删除本地记录的UploadId，然后重启任务
                         [[NSUserDefaults standardUserDefaults] removeObjectForKey:recordKey];
                 }
            
                 NSDictionary *err = @{@"code":@500,@"msg":task.error.localizedDescription};
                 [self sendResultEventWithCallbackId:_cbId dataDict:nil errDict:err doDelete:YES];
         } else {
           // 上传成功，删除本地保存的UploadId
           [[NSUserDefaults standardUserDefaults] removeObjectForKey:recordKey];

           OSSResumableUploadResult *result=task.result;
            
             NSDictionary *ret = @{@"oper":@"complete",@"requestId":result.requestId};
             [self sendResultEventWithCallbackId:_cbId dataDict:ret errDict:nil doDelete:YES];
            

         }
         return nil;
}];