图像不填充外部屏幕

我正在构建一个MonoTouch应用程序，该应用程序在iOS设备屏幕上具有UI，并通过HDMI在第二个屏幕上显示图像。在UIImageView中显示图像时，图像不会填充第二个屏幕。以下是在外部屏幕上设置和显示图像的代码。 UIScreen.Screens [1]的宽度和高度给了我正确的值1920/1080。当我显示图像时，我会在顶部/底部获得1英寸边框，并在左侧/右侧获得1.5英寸边框。使用具有类似外部屏幕设置的MPMoviePlayerController填充屏幕。图像不填充外部屏幕

public void SetImageExternal(string imageFile) 
    { 
     if(string.IsNullOrEmpty(imageFile) == false) 
     { 
      UIScreen externalScreen; 
      UIWindow externalWindow; 
      UIView externalView; 
      UIImageView externalImageView; 
      SizeF externalScreenSize; 

      if(UIScreen.Screens.Length > 1) 
      { 

       if(externalWindow != null) 
        externalWindow.Dispose(); 
       externalWindow = null; 

       externalScreenSize = new SizeF(); 
       externalScreenSize.Width = 0; 
       externalScreenSize.Height = 0; 
       UIScreenMode maxScreenMode = null; 
       externalScreen = UIScreen.Screens[1]; 

       // Use the screen with the largest width 
       for(int i = 0; i < externalScreen.AvailableModes.Length; i++) 
       {  
        UIScreenMode current = UIScreen.Screens[1].AvailableModes[i]; 
        if(current.Size.Width > externalScreenSize.Width) 
        { 
         externalScreenSize = current.Size; 
         maxScreenMode = current; 
        } 
       } 

       externalScreen.CurrentMode = maxScreenMode; 

       externalWindow = new UIWindow(new RectangleF(0, 0, externalScreenSize.Width, externalScreenSize.Height)); 
       externalWindow.RootViewController = new UIViewController(); // create dummy root view controller 
       externalWindow.UserInteractionEnabled = false; 

       externalImageView = new UIImageView(externalWindow.Frame);   
       externalImageView.Image = UIImage.FromBundle(imageFile); 
       externalImageView.ContentMode = UIViewContentMode.ScaleToFill; 

       externalView = new UIView(externalWindow.Frame); 
       externalView.AddSubview(externalImageView); 

       foreach(UIView view in externalWindow.Subviews) 
        view.RemoveFromSuperview(); 
       externalWindow.AddSubview(externalView); 
       externalWindow.MakeKeyAndVisible(); 
       externalWindow.Hidden = false; 
       externalWindow.Screen = externalScreen; 
      } 
     } 
    }

来源

2012-10-02 Vincent

我相信ContentMode决定如何缩放内容的预渲染版本。

但是，UIImageView根据UIImage的LeftCapWidth和TopCapHeight的参数决定如何缩放图像，只有在未设置这些参数时才使用ContentMode。

来源

2012-10-12 15:58:56

图像不填充外部屏幕

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