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

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Tue Feb 8 09:23:24 EST 2011



           Summary: AddSubview and Garbage collection
    Classification: Mono
           Product: MonoTouch
           Version: unspecified
          Platform: x86
        OS/Version: Apple iOS 4.2
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: Runtime
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: clementj at exactmodus.com
         QAContact: mono-bugs at lists.ximian.com
                CC: gnorton at novell.com
          Found By: DeveloperNet
           Blocker: No

Description of Problem:
Following a question on stackoverflow
here is another case where it seems the memory is not garbage collected.

I have these two classes

public class CustomView : UIView
    ~CustomView (){ Console.WriteLine("~CustomView"); }
    public event Action CustomEvent;

public class TestController : UIViewController
    ~TestController (){ Console.WriteLine("~TestController"); }

    public CustomView Custom {get; set;}

    public override void ViewDidLoad ()
        base.ViewDidLoad ();
        Custom = new CustomView();

        // When using AddSubview, I must either unregister the event handler or
        // CustomView from its superview.
        Custom.CustomEvent += HandleEvent;

    private void HandleEvent(){ }

Steps to reproduce the problem:
My MainWindow has a NavigationController and it does the following:

1 - It pushed a new instance of TestViewController (thus only the
NavigationController has a reference to the TestViewController instance)

2- TestViewController is popped via the standard back button. Note that if I
don't use AddSubview, everything is collected as expected.

3 - When I return to the MainWindow, a button allows me to call GC.Collect just
to be sure.

Actual Results:
Neither finalizer is called (TestController or CustomView). In order to be
called,  I need to either unregister the event handler or remove CustomView
from its superview.

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