willRotateToInterfaceOrientation已弃用,但不了解viewWillTransitionToSize:withTransitionCoordinator:

Question

我将我的iPad应用程序移植到iOS8和Swift.

在肖像中,我使用根UIViewController,当de设备旋转到横向时,我转向另一个UIViewController.我提出了两个解决方案,一个基于UIDevice通知,另一个基于willRotateToInterfaceRotation.我总是试图远离观察者模式,这只是我的习惯.

Observer工作正常,但是func的UIViewController中的覆盖willRotateToInterfaceOrientation(toInterfaceOrientation:UIInterfaceOrientation,duration:NSTimeInterval)看起来更清晰;)

但现在在iOS8中该功能已被弃用,我应该使用

func viewWillTransitionToSize(_ size: CGSize,
    withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator)

但我不知道如何使用它来获得相同的结果.

这是rootViewController:

      override func willRotateToInterfaceOrientation(
                     toInterfaceOrientation: UIInterfaceOrientation, 
                                   duration: NSTimeInterval) {

      if (toInterfaceOrientation == UIInterfaceOrientation.LandscapeLeft ||                     
         toInterfaceOrientation == UIInterfaceOrientation.LandscapeRight) {

            self.performSegueWithIdentifier("toLandscape", sender: self)

      }

    }

和UIViewControllerLanscape:

override func willRotateToInterfaceOrientation(
             toInterfaceOrientation: UIInterfaceOrientation, 
                           duration: NSTimeInterval) {

    if (toInterfaceOrientation == UIInterfaceOrientation.Portrait || 
        toInterfaceOrientation == UIInterfaceOrientation.PortraitUpsideDown) {

        self.presentingViewController?.dismissViewControllerAnimated(true,
                                                               completion: nil)

    }
}

我不喜欢使用弃用的函数,所以我不知道该怎么办...去观察者或者什么？

这是我使用的代码(仅)根UIViewController是UIDeviceOrientationDidChangeNotification的观察者:

 override func awakeFromNib() {
    let dev = UIDevice.currentDevice()
    dev.beginGeneratingDeviceOrientationNotifications()

    let nc = NSNotificationCenter.defaultCenter()
    nc.addObserver(self, selector: "orientationChanged:", name: UIDeviceOrientationDidChangeNotification, object: dev) 
 }

 func orientationChanged(note: NSNotification) -> () {
    if let uidevice: UIDevice = note.object? as? UIDevice {

        switch uidevice.orientation {
        case .LandscapeLeft, .LandscapeRight:
                self.performSegueWithIdentifier("toLandscape", sender: self)
        default:
            self.dismissViewControllerAnimated(true, completion: nil)
        }
    }
}

我非常喜欢您对如何为这些已弃用的功能提供解决方案的想法.对我来说这完全是个谜......或者观察者现在可能是更好的解决方案.请分享您的想法.

问候,

jr00n