点击按钮崩溃，unhandeled例外

tacktrace：

在（包装托管到本机）MonoTouch.UIKit.UIApplication.UIApplicationMain（ int，string []，intptr，intptr） at MonoTouch.UIKit.UIApplication.Main（string []，string，string）/Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38中的[0x0004c] （包装器运行时调用）处的F2S.UI.Application.Main（字符串[]）[0x00000]处的 /Users/ravichandra/Desktop/19-10-2012/F2S/F2S.UI/Main.cs:。 .runtime_invoke_void_object（对象，IntPtr的，IntPtr的，IntPtr的）

本地堆栈跟踪：

0 navigation       0x00090dfc mono_handle_native_sigsegv + 284 
1 navigation       0x00005c28 mono_sigsegv_signal_handler + 248 
2 libsystem_c.dylib     0x9ca8259b _sigtramp + 43 
3 ???         0xffffffff 0x0 + 4294967295 
4 UIKit        0x0223555a -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61 
5 UIKit        0x022dab76 -[UIControl sendAction:to:forEvent:] + 66 
6 UIKit        0x022db03f -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 503 
7 UIKit        0x022da2fe -[UIControl touchesEnded:withEvent:] + 549 
8 UIKit        0x0225aa30 -[UIWindow _sendTouchesForEvent:] + 513 
9 UIKit        0x0225ac56 -[UIWindow sendEvent:] + 273 
10 UIKit        0x02241384 -[UIApplication sendEvent:] + 464 
11 UIKit        0x02234aa9 _UIApplicationHandleEvent + 8196 
12 GraphicsServices     0x047f6fa9 PurpleEventCallback + 1274 
13 CoreFoundation      0x0119c1c5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53 
14 CoreFoundation      0x01101022 __CFRunLoopDoSource1 + 146 
15 CoreFoundation      0x010ff90a __CFRunLoopRun + 2218 
16 CoreFoundation      0x010fedb4 CFRunLoopRunSpecific + 212 
17 CoreFoundation      0x010feccb CFRunLoopRunInMode + 123 
18 GraphicsServices     0x047f5879 GSEventRunModal + 207 
19 GraphicsServices     0x047f593e GSEventRun + 114 
20 UIKit        0x02232a9b UIApplicationMain + 1175 
21 ???         0x0d90a384 0x0 + 227582852 
22 ???         0x0d909180 0x0 + 227578240 
23 ???         0x0d9089a0 0x0 + 227576224 
24 ???         0x0d908a2f 0x0 + 227576367 
25 navigation       0x00009fe2 mono_jit_runtime_invoke + 722 
26 navigation       0x0016b87e mono_runtime_invoke + 126 
27 navigation       0x0016fa04 mono_runtime_exec_main + 420 
28 navigation       0x00174df5 mono_runtime_run_main + 725 
29 navigation       0x000671e5 mono_jit_exec + 149 
30 navigation       0x00203e41 main + 2209 
31 navigation       0x00002fe5 start + 53 
32 ???         0x00000005 0x0 + 5

==================================== ============================= 执行本机代码时得到了一个SIGSEGV。这通常表示单声道运行时或其中一个本机库中的致命错误。

============================================== ===================

请人帮我

这里是我的代码

 btnMylocation.Clicked += (sender, e) => 
     { 
      imgbg.Hidden=false; 
      lbltime.Hidden=false; 
      btnup.Hidden=false; 
      btndown.Hidden=false; 
      imghazard.Hidden=false; 
      lblfeets.Hidden=false; 


      try 
      { 
       if(!Reachability.IsHostReachable ("www.google.com")) 
       { 

        alertview.NetworkFail(); 

       } 

       else 
       { 

       this.mysegments.SelectedSegment = 0; 

       mapView.RemoveAnnotations (mapView.Annotations); 

       var locationservice = new LocationService(); 
       var currentLocation = locationservice.GetCurrentLocation(); 
       var visregion = BuildVisibleRegion (currentLocation); 

       mapView.SetRegion (visregion, true); 
       targetimage.Hidden = true; 

       locations = LocationManager.Locations(); 

       List<double> distlist=new List<double>(); 

       foreach(LocationModel d in locations) 
       { 

        var dist=distance (currentLocation.Latitude,currentLocation.Longitude,Convert.ToDouble (d.latitude),Convert.ToDouble (d.longitude)); 
        distlist.Add (dist); 

       } 
       if(distlist.Count!=0) 
       { 

        distlist.Sort(); 
        double min= distlist[0]; 

       foreach (LocationModel f in locations) 
       { 

        string feets = (min*3280).ToString(); 

        var dist=distance (currentLocation.Latitude,currentLocation.Longitude,Convert.ToDouble (f.latitude),Convert.ToDouble (f.longitude)); 

        if(min == dist) 
        { 
         string lat = f.latitude; 
         string lon = f.longitude; 
         NSUserDefaults.StandardUserDefaults.SetString (f.hazardid,"hazardid"); 

         this.View.AddSubview (imgbg); 
         this.View.AddSubview (imghazard); 
         this.View.AddSubview (lblfeets); 
         this.View.AddSubview (btnup); 
         this.View.AddSubview (btndown); 
         this.View.AddSubview (lbltime); 

        if (f.hazardtype == 1) 
        { 

         pins.Clear(); 
         pins.Add (new PoliceAnnotation (new CLLocationCoordinate2D (Convert.ToDouble (lat), Convert.ToDouble (lon)), "Click here to Report","")); 
         mapView.AddAnnotationObject (pins [0]); 
         mapView.AddAnnotation (mapAnnotations [(int)Anotationindex.police]); 

         lblfeets.Text=feets + " fts"; 
         lbltime.Text=f.ReportDate + " Ago"; 
         imghazard.Image=UIImage.FromFile ("Images/police-cop-mark.png"); 

        } 

        else if (f.hazardtype == 2) 
        { 

         duipins.Clear(); 
         duipins.Add (new DuiAnnotation (new CLLocationCoordinate2D (Convert.ToDouble (lat), Convert.ToDouble (lon)), "Click here to Report","")); 
         mapView.AddAnnotationObject (duipins [0]); 
         mapView.AddAnnotation (mapAnnotations [(int)Anotationindex.dui]); 


         lblfeets.Text=feets + " fts"; 
         lbltime.Text=f.ReportDate + " Ago"; 
         imghazard.Image=UIImage.FromFile ("Images/dui-stop-mark.png");  

        } 
        else if(f.hazardtype==3) 
        { 

         campins.Clear(); 
         campins.Add (new SpeedcamAnnotation (new CLLocationCoordinate2D (Convert.ToDouble (lat), Convert.ToDouble (lon)), "","")); 
         mapView.AddAnnotationObject (campins [0]); 
         mapView.AddAnnotation (mapAnnotations [(int)Anotationindex.cam]); 


         lblfeets.Text=feets + " fts"; 
         lbltime.Text=f.ReportDate + " Ago"; 
         imghazard.Image=UIImage.FromFile ("Images/speed-camera-mark.png"); 

        } 

        } 

        } 

        btnup.TouchUpInside += (sender1, e1) => 
        { 

        NSUserDefaults.StandardUserDefaults.SetString("1","Status"); 
        NSUserDefaults.StandardUserDefaults.Init(); 
        Response = LocationManager.ConfirmLocation(); 

        if(Response.Status == "1" || Response.Status == "12") 
        { 
         UIAlertView alert1 = new UIAlertView ("Success","",null,"Ok"); 
         alert1.Show(); 
        } 
        else 
        { 

        } 

        }; 

        btndown.TouchUpInside += (sender1, e1) => 
        { 

        NSUserDefaults.StandardUserDefaults.SetString("0","Status"); 
        NSUserDefaults.StandardUserDefaults.Init(); 
        Response = LocationManager.ConfirmLocation(); 

        if(Response.Status == "1" || Response.Status == "12") 
        { 
         UIAlertView alert1 = new UIAlertView ("Success","",null,"Ok"); 
         alert1.Show(); 
        } 
        else 
        { 

        } 

        }; 

        } 

       } 

       } 
      catch(Exception ex) 
      { 

       if(ex.Message == "Network Fail") 

        alertview.NetworkFail(); 

       else 

        alertview.ProcessFailed(); 

       } 

      };

点击第一次btnMylocation显示弹出与两个按钮，并点击两个按钮工作正常，但是当我试图再次点击btnMylocation它打开弹出窗口，但点击两个按钮中的任何一个btnup和btndown崩溃的应用程序.......任何想法请.. ..

来源

2012-10-31 Dorababu Dodda

它看起来像GC释放了按钮，因为没有人保留对它的引用。你可以显示你的代码，所以我们可以肯定吗？ –

Rolf是对的，有一种方法可以通过不正确地设置事件来发生这种崩溃。这是GC与MonoTouch中Objective-C交互的方式。

因此，举例来说，如果你把这个ViewDidLoad名为myButton的出口，这将很好地工作：

myButton.TouchUpInside += (sender, e) => 
{ 
    //Do something 
};

但是，如果你这样做：

myButton1.TouchUpInside += (sender, e) => 
{ 
    var myButton2 = new UIButton(); 
    myButton2.TouchUpInside += (sender, e) => 
    { 
    //Do something 
    }; 
    //Add button2 to the view, etc. 
};

然后myButton2会点击适当或许这是第一次，但最终你会在GC收集后发生崩溃。发生这种情况的原因是myButton2的C＃包装将收集GarBarge，但Objective-C实例仍然存在。当Objective-C实例获得点击时，它不能调用到C＃中，因为它消失了。

一个简单的方法来解决它，从而使按钮类的成员变量：

private UIButton myButton;

只要确保不要一遍又一遍地创建它。

来源

2012-10-31 12:02:17 jonathanpeppers

我同意这个解决方法 - 但是你已经说明的情况下的崩溃是一个MT错误，不是吗？我不认为myButton2应该在这种情况下收集垃圾，应该吗？（只是检查我明白！） – Stuart

不是一个真正的错误，而是一个限制。我不确定他们可以做些什么来解决它。它现在的工作方式是，如果C＃包装器对象被释放/ GC'd，它将释放它的相应Objective-C对象，如果它的引用计数为零 - 这就是Objective-C中内存管理的工作方式。但是在这种情况下，引用计数不是零，因为它仍然在屏幕上和一系列子视图中。 – jonathanpeppers

是的，我得到了它的感谢..... –

点击按钮崩溃，unhandeled例外

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