- GCD (async should be sync by default and possibly be able to be told when to run explicitly) - Settings Bundle - NSUserDefaults (continue adding more of the interface) - CLLocationManager (confirm/implement updates based on SpecUserLocaiton) - camera - Bluetooth - URLSession (save requests by URLSessionTask and reference them by URLRequest) - Local Notifications - Push Notifications - UIAlertController - UIApplication.setAlternateIconName - UITabBarController - UINavigationController buttons - Device orientation, shake, model, battery level, etc. - UIViewControllerAnimatedTransitioning - Handoff - Universal Links (aka deep linking) - Custom views (logic lives where and what's the interface?) - Sub-UIViewControllers - UIViewControllerAnimatedTransitioning - TouchID - WatchKit
