在通过委托解除其呈现的模态视图控制器后，在UIViewController中刷新数据

I have the delegate working as the data is being passed from the modal to the presenting view controller. But the presenting view controller isn't showing the data it receives from the modal. I looked at other posts and they say to use the delegate/protocol method, but don't explain how/why the presenting VC refreshes. I'm assuming my delegate is setup incorrectly. Otherwise, what is the method to refresh the data? I've checked and the viewWillAppear and viewDidAppear doesn't get called. I have the delegate working as the data is bein