如何将数据从多个视图控制器上传到firebase数据库？

So I have a multi view controller form in which at the end I would like to upload all the data from each view controller to my firebase database. I know one way to do it would be to pass data to the next view controller each time I press the next button with the prepareForSegue function, or I could upload the data in parts for every view controller. Is there a correct method for doing this, or is there another way to upload data from multiple view controllers?So I have a multi view controller form in which