首先，pod导入阿里云SDK；

pod 'AliyunOSSiOS'

其次，配置SDK：

NSString *accessKey = @"你从阿里云控制台拿到的key";
    NSString *secretKey = @"你从阿里云控制台拿到的key";
    NSString *endpoint = @"https://oss-cn-hangzhou.aliyuncs.com";

id<OSSCredentialProvider> credential = [[OSSStsTokenCredentialProvider alloc] initWithAccessKeyId:accessKey secretKeyId:secretKey securityToken:@""];
    
    OSSClient *client = [[OSSClient alloc] initWithEndpoint:endpoint credentialProvider:credential];

OSSPutObjectRequest *put = [OSSPutObjectRequest new];
    put.bucketName = @"阿里云配置的时候起的名字";
    put.uploadingData = [NSData dataWithContentsOfFile:self.cafPathStr];
    put.objectKey = @"文件上传的路径";
    put.uploadProgress = ^(int64_t bytesSent, int64_t totalBytesSent, int64_t totalBytesExpectedToSend) {
        // 当前上传段长度、当前已经上传总长度、一共需要上传的总长度
        NSLog(@"%lld, %lld, %lld", bytesSent, totalBytesSent, totalBytesExpectedToSend);
    };

self.cafPathStr是要上传文件存在沙盒中的地址，[NSData dataWithContentsOfFile:self.cafPathStr]获取路径中的数据，接下来的操作就是接收上传的结果，由于此操作比较慢就是所谓的耗时，在此开启一个子线程处理后续操作：

dispatch_queue_t subQueue = dispatch_queue_create("uploadvoice", DISPATCH_QUEUE_CONCURRENT);
    dispatch_async(subQueue, ^{
        OSSTask * putTask = [client putObject:put];
        [putTask continueWithBlock:^id(OSSTask *task) {
            if (!task.error) {
                NSLog(@"upload object success!");
            } else {
                NSLog(@"upload object failed, error: %@" , task.error);
            }
            return nil;
        }];
        [putTask waitUntilFinished];
        [put cancel];
    });

上传后控制台显示”upload object success!“说明上传成功。