Dynamic Type for some UI components

DynamicTypeUI.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // UINavigationBar title
    [[UINavigationBar appearance] setTitleTextAttributes:@{NSFontAttributeName: [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline]}];
    // UIBarButtonItem title
    [[UIBarButtonItem appearance] setTitleTextAttributes:@{NSFontAttributeName: [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline]}
                                                forState:UIControlStateNormal];
    // UITabBarItem title
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSFontAttributeName: [UIFont preferredFontForTextStyle:UIFontTextStyleCaption1]}
                                             forState:UIControlStateNormal];
    // UISegmentedControl title
    [[UISegmentedControl appearance] setTitleTextAttributes:@{NSFontAttributeName: [UIFont preferredFontForTextStyle:UIFontTextStyleBody]}
                                                   forState:UIControlStateNormal];
    // UISearchBar text and placeholder
    [[UITextField appearanceWhenContainedIn:[UISearchBar class], nil] setFont:[UIFont preferredFontForTextStyle:UIFontTextStyleBody]];

    return YES;
}