1.NavigationBar的设置

UINavigationBar.appearance().tintColor = UIColor.white
let dict:NSDictionary = [NSForegroundColorAttributeName: UIColor.white,NSFontAttributeName : UIFont.boldSystemFont(ofSize: 18)]
UINavigationBar.appearance().titleTextAttributes = dict as? [String : AnyObject]
UINavigationBar.appearance().isTranslucent = false
UINavigationBar.appearance().barTintColor = UIColor.customPurple()

2.页面跳转

extension AppDelegate {
    func showMainView(){
        let vc = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "main") as! ViewController
        
        self.window = UIWindow(frame: UIScreen.main.bounds)
        self.window?.backgroundColor = UIColor.white
        self.window?.rootViewController = vc
        self.window?.makeKeyAndVisible()
    }
}