强制视图控制器重新加载以刷新UIAppearance更改

I have been searching for quite a while and can't find an answer. I am working on an iOS app and have a modal settings page that appears on the tap of a button and returns with a segue. One of the options I would like to implement is a color scheme setting. I really want to avoid manually changing the color for every element on the page.I have been searching for quite a while and can