[MonoTouch] SDK 5 issue

[Sergio Fadda]

Thank you very much,
actually I solved the problem moving only the controllers in AppDelegate 
and MyController (that is, _navCtrl and menuCtrl): since references of 
views, toolbar, etc. are retained by the controllers the GC should not 
remove them when the scopes terminate.

Thank you again!

Il 17/10/2011 17:06, Nic Wise ha scritto:
> ignore the bit about __mt_window :) I thought you were using a XIB and
> a partial class, which does this for you. (ie, how the default
> template does it)
>
> On Mon, Oct 17, 2011 at 16:06, Nic Wise<nicw at fastchicken.co.nz>  wrote:
>> Try moving all the declarations out of FinishedLaunching, eg:
>>
>>
>>>                private MonoTouch.UIKit.UIWindow __mt_window;
>>>                private UITextField _txtField;
>>>
>>>>>>>> THEY should be here!
>>       MyController ctrl1;
>>       UIView mainView;
>>       UIToolbar toolbar;
>>
>>
>>
>>>                public override bool FinishedLaunching (UIApplication app, NSDictionary
>>> options)
>>>                {
>>>                        __mt_window = new UIWindow(UIScreen.MainScreen.Bounds);
>>>                        __mt_window.BackgroundColor = UIColor.White;
>>>
>> why are you using __mt_window? use the window property, which talks to
>>
>>>                        MyController ctrl1 = new MyController();
>>>
>>>                        UIView mainView = new UIView(UIScreen.MainScreen.Bounds);
>>>
>>>>>> NOT HERE!
>>
>>>                        UIToolbar toolbar = new UIToolbar(new RectangleF(0, 0, 320, 30));
>>>                        toolbar.Items = new[]
>>>                        {
>>>                                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace),
>>>                                new UIBarButtonItem(UIBarButtonSystemItem.Done, HandleDoneButton)
>>>                        };
>>>
>>>>>> OR HERE - move UIToolbar out into a class-level variable
>>
>>
>>> Native stacktrace:
>>>
>>>        0   MTFailure                           0x000d5c18
>>> mono_handle_native_sigsegv + 408
>> SIGSEGV is a Signal for a Segment Violation.
>>
>> AKA a Null Pointer Exception.
>>
>> All those things above will be getting GC'ed before you get to use
>> them. The GC in the newer version of MT is (I beleive) a LOT more
>> agressive, so things going out of scope get cleaned up quickly.
>> Putting them in as class var's stops that.
>>
>>
>>
>> N
>>
>> --
>> Nic Wise
>> t.  +44 7788 592 806 | @fastchicken | http://www.linkedin.com/in/nicwise
>> b. http://www.fastchicken.co.nz/
>>
>> Nearest Bus: find when the next bus is coming to your stop. http://goo.gl/Vcz1p
>> mobileAgent (for FreeAgent): get your accounts in your pocket.
>> http://goo.gl/IuBU
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>> London Bike App: Find the nearest Boris Bike, and get riding! http://goo.gl/Icp2
>>
>
>


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