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POProblem with NavigationItem RightBarButtonItem after last update
 

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  1. POProblem with NavigationItem RightBarButtonItem after last update
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    <p>After the last update (4.0.0) I am having an issue and was wondering of this is a bug and is there a fix. </p> <p>As you can see from the code below, I am creating a NavigationItem.RightBarButtonItem and adding a delegate to the TouchUpInside event. The button is created but when the touch occurs, the app dies a horribly(see below). Before this update the code ran perfect.</p> <p>Anyone has any idea? Monotouch team, are you aware of this issue? Maybe I just coded incorrectly and worked before, but the new update has proven I was coding incorrect.</p> <p>Regards,</p> <p>Danny</p> <h2>CODE</h2> <pre><code> //start by creating the view RectangleF f = new RectangleF(0f,0f,38f,38f); UIView v = new UIView(f); //Now create a button with a background UIButton b = new UIButton(f); b.SetBackgroundImage(UIImage.FromFile("Images/Common/info.png"),UIControlState.Normal); //add the button to the view v.Add(b); b.TouchUpInside //give teh button a delegate action b.TouchUpInside += delegate { //var vc3 = new iPhone_HomeView(); //var vc3 = new iPhone_RetardView(); //vc3.Title = "asdasd"; //this.NavigationController.PushViewController (vc3, true); }; //now apply the view to the navigation bar on the right NavigationItem.RightBarButtonItem = new UIBarButtonItem(v); NavigationItem.RightBarButtonItem.Width = 38f; </code></pre> <h2>ERROR</h2> <p>Stacktrace:</p> <p>at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x00038] in /Users/plasma/Source/iphone/monotouch/UIKit/UIApplication.cs:26 at MonoTouch.UIKit.UIApplication.Main (string[]) [0x00000] in /Users/plasma/Source/iphone/monotouch/UIKit/UIApplication.cs:31 at SmartPhoneSolution.Application.Main (string[]) [0x00000] in /Users/aprdev/Projects/SmartPhoneSolution/SmartPhoneSolution/Main.cs:15 at (wrapper runtime-invoke) .runtime_invoke_void_object (object,intptr,intptr,intptr) </p> <p>Native stacktrace:</p> <pre><code>0 SmartPhoneSolution1 0x000d0db5 mono_handle_native_sigsegv + 343 1 SmartPhoneSolution1 0x0000f80c mono_sigsegv_signal_handler + 322 2 libSystem.B.dylib 0x996fb45b _sigtramp + 43 3 ??? 0xffffffff 0x0 + 4294967295 4 UIKit 0x01b92de0 -[UIControl sendAction:to:forEvent:] + 67 5 UIKit 0x01b95262 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 6 UIKit 0x01b93e0f -[UIControl touchesEnded:withEvent:] + 458 7 UIKit 0x01b2b3d0 -[UIWindow _sendTouchesForEvent:] + 567 8 UIKit 0x01b0ccb4 -[UIApplication sendEvent:] + 447 9 UIKit 0x01b119bf _UIApplicationHandleEvent + 7672 10 GraphicsServices 0x05768822 PurpleEventCallback + 1550 11 CoreFoundation 0x00debff4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 12 CoreFoundation 0x00d4c807 __CFRunLoopDoSource1 + 215 13 CoreFoundation 0x00d49a93 __CFRunLoopRun + 979 14 CoreFoundation 0x00d49350 CFRunLoopRunSpecific + 208 15 CoreFoundation 0x00d49271 CFRunLoopRunInMode + 97 16 GraphicsServices 0x0576700c GSEventRunModal + 217 17 GraphicsServices 0x057670d1 GSEventRun + 115 18 UIKit 0x01b15af2 UIApplicationMain + 1160 19 ??? 0x0ba72744 0x0 + 195503940 20 ??? 0x0ba7267a 0x0 + 195503738 21 ??? 0x090bfb9e 0x0 + 151780254 22 ??? 0x090bfaea 0x0 + 151780074 23 ??? 0x090bfb75 0x0 + 151780213 24 SmartPhoneSolution1 0x0000f5c7 mono_jit_runtime_invoke + 1332 25 SmartPhoneSolution1 0x001ed281 mono_runtime_invoke + 137 26 SmartPhoneSolution1 0x001ef968 mono_runtime_exec_main + 669 27 SmartPhoneSolution1 0x001eed52 mono_runtime_run_main + 843 28 SmartPhoneSolution1 0x000a3153 mono_jit_exec + 200 29 SmartPhoneSolution1 0x002a16b8 main + 4155 30 SmartPhoneSolution1 0x00002949 _start + 208 31 SmartPhoneSolution1 0x00002878 start + 40 </code></pre> <p>Debug info from gdb:</p> <p>/tmp/mono-gdb-commands.WL0ypx:1: Error in sourced command file: unable to debug self</p> <p>================================================================= Got a SIGSEGV while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries </p> <h1>used by your application.</h1> <p>Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr) at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/plasma/Source/iphone/monotouch/UIKit/UIApplication.cs:26 at MonoTouch.UIKit.UIApplication.Main (System.String[] args) [0x00000] in /Users/plasma/Source/iphone/monotouch/UIKit/UIApplication.cs:31 at SmartPhoneSolution.Application.Main (System.String[] args) [0x00000] in /Users/aprdev/Projects/SmartPhoneSolution/SmartPhoneSolution/Main.cs:15 </p>
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    1. COI am getting a similar error with selecting a cell in a tableview. And only after the update to MonoTouch 4
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    2. COOk. Simple fix. Ensure that atleast one object in the object's hierarchy is in class scoped. Will ensure that everything below it is retained.
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