iOS - Globally change navigation bar title color using appearance?

Question

This crashes the app:

[[UINavigationBar appearance] setTitleColor:[UIColor darkGrayColor] forState:UIControlStateNormal];

Is there a way to do

Answer 1

Here's an example of how to do this in Swift:

UINavigationBar.appearance().titleTextAttributes =
  [NSFontAttributeName:UIFont(name:"Exo2-Bold", size: 18) as! AnyObject,
  NSForegroundColorAttributeName:UIColor.whiteColor()]