Ios 在swift中实现GTScrollNavigationBar

我正在尝试在我的swift项目中使用。我不熟悉斯威夫特和iOS。因此，我使用obj-C中的演示项目来实现它。 演示项目的AppDelegate如下所示

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    self.viewController = [[DemoTableViewController alloc] initWithStyle:UITableViewStylePlain];
    self.navController = [[UINavigationController alloc] initWithNavigationBarClass:[GTScrollNavigationBar class] toolbarClass:nil];
    [self.navController setViewControllers:@[self.viewController] animated:NO];
    self.window.rootViewController = self.navController;
    [self.window makeKeyAndVisible];
    return YES;
}

我已经在swift中实现了它，如下所示

var window: UIWindow?
    var navigationController : UINavigationController?
    var viewController : UIViewController?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        self.window?.backgroundColor = UIColor.whiteColor()

        self.viewController = TableViewController(style: UITableViewStyle.Plain)
        self.navigationController = UINavigationController(navigationBarClass: GTScrollNavigationBar.self, toolbarClass: nil)
        (self.window!.rootViewController as! UINavigationController).viewControllers = [viewController!]
        self.window?.rootViewController = self.navigationController
        self.window?.makeKeyAndVisible()


        return true
    }

它显示了在此行展开可选值时意外发现的错误，该值为零

（self.window！.rootViewController as！UINavigationController）。viewControllers=[viewController！]

---

有人能告诉我我做错了什么吗？

您的代码应该翻译成Swift，如下所示：

self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window?.backgroundColor = UIColor.whiteColor()

self.viewController = UITableViewController(style: UITableViewStyle.Plain)

self.navigationController = UINavigationController(navigationBarClass: GTScrollNavigationBar.self, toolbarClass: nil)
self.navigationController?.viewControllers = [viewController!]

self.window?.rootViewController = self.navigationController
self.window?.makeKeyAndVisible()

我使用

navigationBar

而不是

GTScrollNavigationBar

来测试它；它似乎在工作