title: iOS UILabel.appearance().textColor is not available
body: <p>I am trying to change default text color for all labels in my app. I have tried to use <code>UILabel.appearance().textColor</code>, but it's not available for me. Can somebody advise what am I doing wrong? I have checked a lot of questions on SO, the latest one is <a href="https://stackoverflow.com/questions/41278153/the-default-text-color-for-all-uilabels">this</a>. And as per description it's available.</p>
  
  <p><a href="https://i.stack.imgur.com/O6pJY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/O6pJY.png" alt="Xcode screenshot of UIAppearance autocompletions"></a></p>
  
  <p>If I changed background color - it works. Tried to change <code>tintColor</code> - no effect. Why? Was it removed from UIAppearance protocol?</p>
  
  <pre><code>@UIApplicationMain
  class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {
      var window: UIWindow?
      var smStore: SMStore?
  
      func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -&gt; Bool {
  
          // UIAppearance configuring
              let tintColor = UIColor.white
              //let backgroundColor = UIColor(red: 5, green: 72, blue: 149, alpha: 1)
              let backgroundColor = UIColor.black
  
              // Global tintColor
              window?.tintColor = tintColor
  
              // UIViews
              UIView.appearance().tintColor = tintColor
              UIView.appearance().backgroundColor = backgroundColor
  
              // UINavigationBars
              UINavigationBar.appearance().tintColor = tintColor
              UINavigationBar.appearance().backgroundColor = tintColor
  
              // UITableViews
              UITableView.appearance().backgroundColor = backgroundColor
              UITableViewCell.appearance().backgroundColor = backgroundColor
              UITableViewCell.appearance().tintColor = tintColor
  
              // UILabels
              UILabel.appearance().backgroundColor = UIColor.green
              ...
          }
  </code></pre>
  
  <p>Xcode 9, Swift 4.</p>