title: Changing navigation bar color in Swift
body: <p>I am using a Picker View to allow the user to choose the colour theme for the entire app.</p>
  
  <p>I am planning on changing the colour of the navigation bar, background and possibly the tab bar (if that is possible).</p>
  
  <p>I've been researching how to do this but can't find any Swift examples. Could anyone please give me an example of the code I would need to use to change the navigation bar colour and navigation bar text colour?</p>
  
  <p>The Picker View is set up, I'm just looking for the code to change the UI colours.</p>