[Mono-bugs] [Bug 670294] AddSubview and Garbage collection

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https://bugzilla.novell.com/show_bug.cgi?id=670294

https://bugzilla.novell.com/show_bug.cgi?id=670294#c14


--- Comment #14 from Jonathan Clement <clementj at exactmodus.com> 2011-04-21 20:33:42 UTC ---
I detect view pop with a UINavigationControllerDelegate. Then, I check if the
UIViewController implements ICleanable: a custom interface with a single method
Clean. In the Clean method I just unregister with -= to any event.

In my case it seems to work because my viewcontroller's finalizer gets called.
But, since I cannot use mono 2.10 runtime's profiler (yet), I cannot be sure
100% that all my objects get cleaned up ...

class CustomNavigationControllerDelegate : UINavigationControllerDelegate
{
  private UIViewController lastPushed;
  private int lastControllerCount = 0;

  public event Action<UIViewController> ViewControllerPopped;

  public override void DidShowViewController (
    UINavigationController navigationController, 
    UIViewController viewController, 
    bool animated)
  {
      int currentCount = navigationController.ViewControllers.Length;
      if(currentCount < lastControllerCount && ViewControllerPopped != null ){
         ViewControllerPopped(lastPushed);
      }

      lastControllerCount = currentCount;
      lastPushed = viewController;
   }
}

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