[MonoTouch] Cannot inherit from UIAlertView

[Andrew Young]

App crashes when I try to inherit from UIAlertView. See stack trace and sample code below. MonoTouch 5.0.

Any ideas? I have a sample app that shows this for anyone interested.

public class ViewController : UIViewController
{
  private DateTimePickerView _pickerView;
  public ViewController ()
  {
  }

  public override void ViewDidLoad ()
  {
    base.ViewDidLoad ();
    new NotReachableAlertView ().Show ();
  }
}

public class NotReachableAlertView : UIAlertView
{
  public NotReachableAlertView() : base("Title", "Message", null, "Cancel")
  {
  }
}


Unhandled Exception: MonoTouch.Foundation.MonoTouchException: Objective-C exception thrown.  Name: NSInternalInconsistencyException Reason: Requesting the window of a view (<PickerViewCrash.NotReachableAlertView: 0x79a700; baseClass = UIAlertView; frame = (0 0; 0 0); transform = [0, 0, 0, 0, 0, 0]; alpha = 0; opaque = NO; layer = (null)>) with a nil layer. This view probably hasn't received initWithFrame: or initWithCoder:.
  at MonoTouch.UIKit.UIAlertView.Show () [0x00000] in <filename unknown>:0 
  at PickerViewCrash.ViewController.ViewDidLoad () [0x00006] in /Users/Andrew/Projects/PickerViewCrash/ViewController.cs:20 
  at MonoTouch.UIKit.UIWindow.MakeKeyAndVisible () [0x00000] in <filename unknown>:0 
  at PickerViewCrash.AppDelegate.FinishedLaunching (MonoTouch.UIKit.UIApplication app, MonoTouch.Foundation.NSDictionary options) [0x00031] in /Users/Andrew/Projects/PickerViewCrash/AppDelegate.cs:32 
  at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00000] in <filename unknown>:0 
  at PickerViewCrash.Application.Main (System.String[] args) [0x00000] in /Users/Andrew/Projects/PickerViewCrash/Main.cs:16 
[ERROR] FATAL UNHANDLED EXCEPTION: MonoTouch.Foundation.MonoTouchException: Objective-C exception thrown.  Name: NSInternalInconsistencyException Reason: Requesting the window of a view (<PickerViewCrash.NotReachableAlertView: 0x79a700; baseClass = UIAlertView; frame = (0 0; 0 0); transform = [0, 0, 0, 0, 0, 0]; alpha = 0; opaque = NO; layer = (null)>) with a nil layer. This view probably hasn't received initWithFrame: or initWithCoder:.
  at MonoTouch.UIKit.UIAlertView.Show () [0x00000] in <filename unknown>:0 
  at PickerViewCrash.ViewController.ViewDidLoad () [0x00006] in /Users/Andrew/Projects/PickerViewCrash/ViewController.cs:20 
  at MonoTouch.UIKit.UIWindow.MakeKeyAndVisible () [0x00000] in <filename unknown>:0 
  at PickerViewCrash.AppDelegate.FinishedLaunching (MonoTouch.UIKit.UIApplication app, MonoTouch.Foundation.NSDictionary options) [0x00031] in /Users/Andrew/Projects/PickerViewCrash/AppDelegate.cs:32 
  at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00000] in <filename unknown>:0 
  at PickerViewCrash.Application.Main (System.String[] args) [0x00000] in /Users/Andrew/Projects/PickerViewCrash/Main.cs:16 
Terminating runtime due to unhandled exception


-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.ximian.com/pipermail/monotouch/attachments/20111020/a540ddcf/attachment.html