What worked for years was

self.navigationController?.navigationBar.barTintColor = MY_COLOR

but in iOS15 this is not working. There's answers for how to change it on app start, but I need to change it after the nav bar's been shown and without reloading the view controller. This is possible in iOS 14 and older.

CodePudding user response：

In your VC you can try adjusting the view.backgroundColor

      UINavigationBar?.view.backgroundColor = MY_COLOR