Ios 斯威夫特：定制赛格后，我如何保留嵌入式导航控制器？

我正在尝试从嵌入导航控制器的视图控制器设置自定义segue。当我使用show segue时，一切正常，导航栏仍如预期的那样。但是，当我尝试使用自定义segue类时，导航栏消失了。检查后，post custom segue view控制器中不存在导航控制器。因此，问题似乎来自使用自定义segue：如何使用自定义segue保持在导航控制器中？这是我的自定义segue代码，其目的是使segue具有从上到下的滑动效果：

class FirstCustomSegue: UIStoryboardSegue {
override func perform() {
    var firstVCView = self.sourceViewController.view as UIView!
    var secondVCView = self.destinationViewController.view as UIView!

    // Get the screen width and height.
    let screenWidth = UIScreen.mainScreen().bounds.size.width
    let screenHeight = UIScreen.mainScreen().bounds.size.height

    // Specify the initial position of the destination view.
    secondVCView.frame = CGRectMake(0.0, -screenHeight, screenWidth, screenHeight)

    // Access the app's key window and insert the destination view above the current (source) one.
    let window = UIApplication.sharedApplication().keyWindow
    window?.insertSubview(secondVCView, aboveSubview: firstVCView)

    // Animate the transition.
    UIView.animateWithDuration(1, animations: { () -> Void in
        firstVCView.frame = CGRectOffset(firstVCView.frame, 0.0, screenHeight)
        secondVCView.frame = CGRectOffset(secondVCView.frame, 0.0, screenHeight)

        }) { (Finished) -> Void in
            self.sourceViewController.presentViewController(self.destinationViewController as! UIViewController,
                animated: false,
                completion: nil)
    }

}

---

}

我认为对于自定义序列，必须执行

navigationController.pushViewController（）

操作，以使新VC显示在旧NC堆栈上。我看不出有什么办法可以通过定制segue实现这一点。然而，我确实看到了一种让事情看起来像是真的发生的方法：

class FirstCustomSegue: UIStoryboardSegue {
override func perform() {
    let firstVCView = self.sourceViewController.view as UIView!
    let secondVCView = self.destinationViewController.view as UIView!

    // Get the screen width and height.
    let screenWidth = UIScreen.mainScreen().bounds.size.width
    let screenHeight = UIScreen.mainScreen().bounds.size.height

    // Specify the initial position of the destination view.
    secondVCView.frame = CGRectMake(0.0, -screenHeight, screenWidth, screenHeight)

    // make a UIView which looks like the sourceViewController's view, 
    // and add it to the destinationViewcontrollers's view, 
    // in the right place so it looks as though it does not move
    let v1 = firstVCView.snapshotViewAfterScreenUpdates(false)
    v1.frame = CGRectMake(0, screenHeight, screenWidth, screenHeight)
    secondVCView.addSubview(v1)

    // push the destination VC without animation
    // but it looks the same as the first so it seems as though nothing has happened.
    self.sourceViewController.navigationController?.pushViewController(self.destinationViewController, animated: false)
    // Animate the transition.
    UIView.animateWithDuration(1, animations: { () -> Void in
            secondVCView.frame = CGRectOffset(secondVCView.frame, 0.0, screenHeight)
        }) { (Finished) -> Void in
            v1.removeFromSuperview()
        }
    }
}

---

这会使

pushViewController

不带动画，然后通过将源视图的快照临时放置到第二个视图上，使其看起来像动画一样。它在我的iPad上看起来还可以。

这是与相同的问题，但还没有回答。有趣的问题，我还不确定我是否正确理解它，这是最好的一种！谢谢你的提醒！