从未显示添加到UIScrollView的UIRefreshControl

I have decided to use UIScrollView instead of UITableView in my app for many reasons. When I was using UITableView, I was able to add a UIRefreshControl with no issue whatsoever. When I use the same code on my UIScrollView however, nothing happens. I have tried several third-party refresher libraries, and none seem to work. Any help is appreciated.I have decided to use UIScrollView instead of U