iOS上实现阿里云OSS断点续传

typedef void(^AliyunOSSSuccessBlock) (NSString* fileName);
typedef void(^AliyunOSSFailBlock)(NSString *errorDescription, NSInteger errorCode);
typedef void(^AliyunOSSProgressBlock) (int64_t bytesSent, int64_t totalBytes);
/*!
 OSS断点续传
 @param fileName oss的文件名,最好是随机名字
 @param fileUrl 本地的文件名,断点续传只能用本地文件
 */
- (void)resumableUploadWithName : (NSString *)fileName
                        fileUrl : (NSURL* ) fileUrl
                        successes:(AliyunOSSSuccessBlock)success
                             fail:(AliyunOSSFailBlock)fail
                        progress:(AliyunOSSProgressBlock)progress
{

    
    // 获得UploadId进行上传，如果任务失败并且可以续传，利用同一个UploadId可以上传同一文件到同一个OSS上的存储对象
    OSSResumableUploadRequest * resumableUpload = [OSSResumableUploadRequest new];
    resumableUpload.bucketName = OSSBucketKey;
    resumableUpload.objectKey = [NSString stringWithFormat:@"%@%@", OSSObjectKey, fileName];
    resumableUpload.partSize = 1024 * 1024;
    resumableUpload.uploadProgress = ^(int64_t bytesSent, int64_t totalByteSent, int64_t totalBytesExpectedToSend) {
        progress(totalByteSent, totalBytesExpectedToSend);
    };
    NSString *cachesDir = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject];
    //设置断点记录文件
    resumableUpload.recordDirectoryPath = cachesDir;
    //设置NO,取消时，不删除断点记录文件，如果不进行设置，默认YES，是会删除断点记录文件，下次再进行上传时会重新上传。
    resumableUpload.deleteUploadIdOnCancelling = NO;
    resumableUpload.uploadingFileURL = fileUrl;
    OSSTask * resumeTask = [client resumableUpload:resumableUpload];
    [resumeTask continueWithBlock:^id(OSSTask *task) {
        if (task.error) {
            NSLog(@"error: %@", task.error);
            fail(task.error.localizedDescription, task.error.code);
            if ([task.error.domain isEqualToString:OSSClientErrorDomain] && task.error.code == OSSClientErrorCodeCannotResumeUpload) {
                // 该任务无法续传，需要获取新的uploadId重新上传
            } else {
            }
        } else {
            success(fileName);
        }
        return nil;
    }];
}