Styling NavigationBar

[Hans Pistor]

To style a navigation bar, you can do something like this

struct TaskListView: View {
    init() {
      UINavigationBar.appearance().largeTitleTextAttributes = [
        .foregroundColor: UIColor.systemRed
     ]
  }

    ... rest of struct

I would make a PR but to build using master requires the Google plist file for firebase.