如何将ImageView添加到自定义Segue中？

1 UIViewController中创建一个自定义赛格瑞 - > ImageView的 - >第2的UIViewController

我作品中的代码，但由于某些原因，ImageView的是黑色的。我试过使用各种图像和文字图像来源，但它仍然是黑色的。

这里的一些图片，更好understanding-

1（作为第一UIViewController中由ImageView的替换）

2（作为ImageView的是由第二个UIViewController取代）

/** 
This segue transitions by dragging the destination UIViewController in from the right and replacing the old UIViewController by pushing it off to the left. This Segue also contains an ImageView that is between the two UIViewControllers. 
*/ 
class CustomSegue2: UIStoryboardSegue { 

    override func perform() { 

     // Assign the source and destination views to local variables. 
     let firstView = self.source.view as UIView! 
     let secondView = UIImageView() 
     let thirdView = self.destination.view as UIView! 

     // Get the screen width and height. 
     let width = UIScreen.main.bounds.size.width 
     let height = UIScreen.main.bounds.size.height 

     // Set properties of secondView 
     secondView.frame = CGRect(x: width, y: 0, width: width, height: height) 
     secondView.contentMode = UIViewContentMode.scaleToFill 
     secondView.image = #imageLiteral(resourceName: "orangeRedGradient_MESH_tealGreenGradient") 

     // Specify the initial position of the destination view. 
     let rect = CGRect(x: width + width, y: 0.0, width: width, height: height) 
     thirdView?.frame = rect 

     // Access the app's key window and insert the destination view above the current 
     let window = UIApplication.shared.keyWindow 
     window?.insertSubview(thirdView!, aboveSubview: firstView!) 


     // Animation the transition. 
     UIView.animate(withDuration: 10, animations: {() -> Void in 
      firstView?.frame = firstView!.frame.offsetBy(dx: -width-width, dy: 0.0) 
      secondView.frame = secondView.frame.offsetBy(dx: -width-width, dy: 0.0) 
      thirdView?.frame = thirdView!.frame.offsetBy(dx: -width-width, dy: 0.0) 
     }) { (Finished) -> Void in 
      self.source.present(self.destination, animated: false, completion: nil) 
     } 
    } 

}

来源

2017-03-02 Frank Minyon

这是非常标准的赛格？我正在谈论*准备（对于Segue：发件人：）*和* performSegue（withIdentifier：发件人：）*。如果是这样，请发布该代码。谢谢。 – dfd