递归上传多张图片

// 保存
- (void)save{
    
   
    [SYS_NETSERVICE YGPOST:@"getAliyunToken" parameters:@{} showLoadingView:YES scrollView:nil success:^(id responseObject) {
        
        [[AliyunOSSDemo sharedInstance] initOSSClientWithAccessKeyId:responseObject[@"AccessKeyId"] secretKeyId:responseObject[@"SecretKeyId"] securityToken:responseObject[@"token"]];
        [_uploadURLArray removeAllObjects];
        [SYS_NETSERVICE showLoadingViewWithSuperView:SYS_APPDELEGATE.window];
        [self mutiUploadWithIndex:0];
    } failure:nil];
}

- (void)mutiUploadWithIndex:(NSInteger)index
{
    if (index == _selectedPhotos.count)
    {
         [SYS_NETSERVICE dissmissLoadingView];
        if (_uploadURLArray.count != _selectedPhotos.count)
        {
            [YGAppTool showToastWithText:@"上传图片出错,请重试"];
            return;
        }
        [self mutiUploadFinished];
        return;
    }
    
    [[AliyunOSSDemo sharedInstance] uploadFileWithFileData:UIImageJPEGRepresentation(_selectedPhotos[index], 0.3)  fileSuffix:@"_ios.jpeg" progressHandler:nil completeHandler:^(NSError *error, NSString *urlString) {
        
        if(!error)
        {
            [_uploadURLArray addObject:urlString];
        }
        [self mutiUploadWithIndex:index + 1];
    }];
}

- (void)mutiUploadFinished
{
    [SYS_NETSERVICE YGPOST:REQUEST_MyTeacherResumeSave parameters:@{@"teacherId":SYS_SINGLETON.user.ID,@"introducImg":[_uploadURLArray componentsJoinedByString:@"|"],@"introduce":_detailTextView.text} showLoadingView:YES scrollView:nil success:^(id responseObject) {
        [YGAppTool showToastWithText:@"保存成功"];
        [self.navigationController popViewControllerAnimated:YES];
    } failure:nil];
}