swift nav bar is yellow code example
Example: swift change navigation bar color
// Navigation Bar:
navigationController?.navigationBar.barTintColor = UIColor.green
// Navigation Bar Text:
navigationController?.navigationBar.titleTextAttributes = [.foregroundColor: UIColor.orange]
// Tab Bar:
tabBarController?.tabBar.barTintColor = UIColor.brown
// Tab Bar Text:
tabBarController?.tabBar.tintColor = UIColor.yellow