StackOverflow2013

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PONSInvalidArgumentException Reason - [xxxx backdropView:willChangeToGraphicsQuality]
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copied!<p>I am using Xamarin and after updating to iOS 7 sdk my application keeps crashing...I have a function that I pass into my second view controller from my first view controller as an action that simply is:</p> <pre><code> public void Dismiss() { try{ this.PresentedViewController.DismissViewController (false, null); } catch(Exception ex) { string filePath = Path.Combine(path, "log.txt"); File.AppendAllText(filePath,"\n" + DateTime.Now + "\tISSUE:\t Closing colletions detail tab...\n\n" + ex.Message + " " + ex.StackTrace); } } </code></pre> <p>Now the application is crashes even after catching the exception. What gets printed in my log is:</p> <pre><code>Objective-C exception thrown. Name: NSInvalidArgumentException Reason: [UILabel backdropView:willChangeToGraphicsQuality:]: unrecognized selector sent to instance 0x18c8ee40 at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging:void_objc_msgSendSuper_bool_IntPtr (intptr,intptr, bool, intptr) at MonoTouch.UIKit.UIViewController.DismissViewController(Boolean animated, MonoTouch.Foundation.NSAction completionHandler) [0x00057] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIViewController.g.cs 747 at YltraRoute.MainViewController.CloseCollectionDetailTab()[0x00011]... </code></pre> <p>I don't even know where to start with this. There is not much help out there.</p> <p>Oh and its not always [UILabel backdropView... its sometime UIScrollViewPanGuestureRecognizer </p> <p>So I have done more searching and it seems that this may be a memory issue (object already garbage collected). </p> <p>I got that info from <a href="http://imlocation.wordpress.com/2007/09/13/strange-objects-nscftype-indicate-memory-management-bugs/" rel="nofollow">here</a> as another version of the fault was:</p> <pre><code>Objective-C exception thrown. Name: NSInvalidArgumentException Reason: -[__NSCFType backdropView:willChangeToGraphicsQuality:]: unrecognized selector sent to instance 0x1eb3ad70 </code></pre> <p>So if this is truly the case how do I go about this. There is no way that the presenting view controller could be released already right? And the presented view controller is declared globally in my class as well.</p>

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