iOS上的屏幕边界问题

Question

我对iOS编码很新，所以我使用了一些我在github上找到的库。我有一个加载弹出UIDatePicker的工作正常，直到我添加代码来选择应用首次启动时加载哪个视图。这是我能找到的所有相关代码。任何帮助将不胜感激。

来自DatePickerDialog：

func countScreenSize() -> CGSize {
    var screenWidth = UIScreen.mainScreen().bounds.size.width
    var screenHeight = UIScreen.mainScreen().bounds.size.height

    let interfaceOrientaion = UIApplication.sharedApplication().statusBarOrientation

    if UIInterfaceOrientationIsLandscape(interfaceOrientaion) {
        let tmp = screenWidth
        screenWidth = screenHeight
        screenHeight = tmp
    }

    return CGSizeMake(screenWidth, screenHeight)
}

override init() {
    super.init(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.size.width, UIScreen.mainScreen().bounds.size.height))

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "deviceOrientationDidChange:", name: UIDeviceOrientationDidChangeNotification, object: nil)
}

以下是我添加到app delegate的代码，用于选择要加载的视图：

if currentUser != nil {

    var storyboard = UIStoryboard(name: "Main", bundle: nil)

    var initialViewController = storyboard.instantiateViewControllerWithIdentifier("loggedin") as UIViewController

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

} else {

    var storyboard = UIStoryboard(name: "Main", bundle: nil)

    var initialViewController = storyboard.instantiateViewControllerWithIdentifier("start") as UIViewController

    self.window?.rootViewController = initialViewController
    self.window?.makeKeyAndVisible()
}