UIWebView LoadFinished 事件在设备上崩溃但不在模拟器上

Question

我正在尝试创建 UIWebView 并加载页面。加载完成后，我想移动到另一个屏幕。 以下代码适用于 iOS 模拟器，但不适用于设备。 我尝试按照这个答案 (Monotouch + UIWebView = Random Crashes)，将 NSUrlRequest 提升为全局变量，但错误仍然存​​在。

我尝试使用 try{} catch{}，但它在崩溃时不会捕获任何异常。这让我发疯:)

void LoadSite(){

webView = new UIWebView (new CGRect (0, 0, 300,300));
string url = "http://google.com";
NSUrlRequest request = new NSUrlRequest(new NSUrl(url));
View.AddSubview (webView);

webView.LoadFinished+= (object sender, EventArgs e) => {
 // CRASHES
};

webView.LoadRequest(request);
}

知道如何解决这个问题吗？ 谢谢。

2015-05-03 19:28:08.465 Baru[5549:638056] critical: Stacktrace:

2015-05-03 19:28:08.466 Baru[5549:638056] critical:   at <unknown> <0xffffffff>
2015-05-03 19:28:08.467 Baru[5549:638056] critical:   at (wrapper managed-to-native) ObjCRuntime.Messaging.IntPtr_objc_msgSend (intptr,intptr) <0xffffffff>
2015-05-03 19:28:08.469 Baru[5549:638056] critical:   at ObjCRuntime.Class.GetClassForObject (intptr) [0x00000] in /Users/builder/data/lanes/1503/6481535e/source/maccore/src/ObjCRuntime/Class.cs:111
2015-05-03 19:28:08.470 Baru[5549:638056] critical:   at ObjCRuntime.Runtime.GetNSObject (intptr,System.Type,ObjCRuntime.Runtime/MissingCtorResolution,bool,bool&) [0x00024] in /Users/builder/data/lanes/1503/6481535e/source/maccore/src/ObjCRuntime/Runtime.cs:836
2015-05-03 19:28:08.471 Baru[5549:638056] critical:   at ObjCRuntime.Runtime.GetNSObjectWithType (intptr,intptr,bool&) [0x0000c] in /Users/builder/data/lanes/1503/6481535e/source/maccore/src/ObjCRuntime/Runtime.cs:383
2015-05-03 19:28:08.472 Baru[5549:638056] critical:   at ObjCRuntime.Runtime.get_nsobject_with_type (intptr,intptr,bool&) [0x00000] in /Users/builder/data/lanes/1503/6481535e/source/maccore/runtime/Delegates.generated.cs:208
2015-05-03 19:28:08.473 Baru[5549:638056] critical:   at (wrapper native-to-managed) ObjCRuntime.Runtime.get_nsobject_with_type (intptr,intptr,int&) <0xffffffff>
2015-05-03 19:28:08.473 Baru[5549:638056] critical:   at <unknown> <0xffffffff>
2015-05-03 19:28:08.474 Baru[5549:638056] critical:   at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <0xffffffff>
2015-05-03 19:28:08.475 Baru[5549:638056] critical:   at UIKit.UIApplication.Main (string[],intptr,intptr) [0x00005] in /Users/builder/data/lanes/1503/6481535e/source/maccore/src/UIKit/UIApplication.cs:63
2015-05-03 19:28:08.476 Baru[5549:638056] critical:   at UIKit.UIApplication.Main (string[],string,string) [0x0001c] in /Users/builder/data/lanes/1503/6481535e/source/maccore/src/UIKit/UIApplication.cs:46
2015-05-03 19:28:08.476 Baru[5549:638056] critical:   at Baru.Application.Main (string[]) [0x00008] in /Users/Montein/Proyectos/BRU/Solution/Baru/Baru/Main.cs:17
2015-05-03 19:28:08.477 Baru[5549:638056] critical:   at (wrapper runtime-invoke) object.runtime_invoke_dynamic (intptr,intptr,intptr,intptr) <0xffffffff>
2015-05-03 19:28:08.478 Baru[5549:638056] critical: 
Native stacktrace:

2015-05-03 19:28:08.552 Baru[5549:638056] critical:     0   Baru                                0x00000001003ee998 mono_handle_native_sigsegv + 264
2015-05-03 19:28:08.553 Baru[5549:638056] critical:     1   Baru                                0x00000001003f8c6c mono_sigsegv_signal_handler + 324
2015-05-03 19:28:08.554 Baru[5549:638056] critical:     2   libsystem_platform.dylib            0x0000000194da495c _sigtramp + 68
2015-05-03 19:28:08.555 Baru[5549:638056] critical:     3   Baru                                0x0000000100139a18 wrapper_managed_to_native_ObjCRuntime_Messaging_IntPtr_objc_msgSend_intptr_intptr + 104
2015-05-03 19:28:08.555 Baru[5549:638056] critical:     4   Baru                                0x00000001000f9278 ObjCRuntime_Class_GetClassForObject_intptr + 40
2015-05-03 19:28:08.556 Baru[5549:638056] critical:     5   Baru                                0x00000001000f17a8 ObjCRuntime_Runtime_GetNSObject_intptr_System_Type_ObjCRuntime_Runtime_MissingCtorResolution_bool_bool_ + 120
2015-05-03 19:28:08.557 Baru[5549:638056] critical:     6   Baru                                0x00000001000ef8dc ObjCRuntime_Runtime_GetNSObjectWithType_intptr_intptr_bool_ + 108
2015-05-03 19:28:08.558 Baru[5549:638056] critical:     7   Baru                                0x00000001000ede44 ObjCRuntime_Runtime_get_nsobject_with_type_intptr_intptr_bool_ + 36
2015-05-03 19:28:08.558 Baru[5549:638056] critical:     8   Baru                                0x0000000100141c48 wrapper_native_to_managed_ObjCRuntime_Runtime_get_nsobject_with_type_intptr_intptr_int_ + 104
2015-05-03 19:28:08.559 Baru[5549:638056] critical:     9   Baru                                0x00000001004afb78 xamarin_get_nsobject_with_type + 52
2015-05-03 19:28:08.559 Baru[5549:638056] critical:     10  Baru                                0x00000001004afec4 xamarin_get_nsobject_with_type_for_ptr_created + 228
2015-05-03 19:28:08.560 Baru[5549:638056] critical:     11  Baru                                0x00000001004b9500 xamarin_trampoline + 3860
2015-05-03 19:28:08.561 Baru[5549:638056] critical:     12  CoreFoundation                      0x0000000182d5a100 <redacted> + 144
2015-05-03 19:28:08.561 Baru[5549:638056] critical:     13  CoreFoundation                      0x0000000182c562fc <redacted> + 296
2015-05-03 19:28:08.562 Baru[5549:638056] critical:     14  CoreFoundation                      0x0000000182c5ae30 <redacted> + 68
2015-05-03 19:28:08.562 Baru[5549:638056] critical:     15  WebKitLegacy                        0x00000001924c0898 <redacted> + 172
2015-05-03 19:28:08.562 Baru[5549:638056] critical:     16  CoreFoundation                      0x0000000182d57f6c <redacted> + 440
2015-05-03 19:28:08.562 Baru[5549:638056] critical:     17  CoreFoundation                      0x0000000182c5accc _CF_forwarding_prep_0 + 92
2015-05-03 19:28:08.563 Baru[5549:638056] critical:     18  CoreFoundation                      0x0000000182d5a100 <redacted> + 144
2015-05-03 19:28:08.563 Baru[5549:638056] critical:     19  CoreFoundation                      0x0000000182c562fc <redacted> + 296
2015-05-03 19:28:08.563 Baru[5549:638056] critical:     20  WebCore                             0x000000019164bda8 <redacted> + 212
2015-05-03 19:28:08.563 Baru[5549:638056] critical:     21  WebKitLegacy                        0x00000001924c0650 <redacted> + 128
2015-05-03 19:28:08.563 Baru[5549:638056] critical:     22  WebCore                             0x0000000191659414 <redacted> + 84
2015-05-03 19:28:08.564 Baru[5549:638056] critical:     23  WebCore                             0x0000000191658790 <redacted> + 812
2015-05-03 19:28:08.564 Baru[5549:638056] critical:     24  WebCore                             0x0000000191a6d694 <redacted> + 56
2015-05-03 19:28:08.564 Baru[5549:638056] critical:     25  WebCore                             0x0000000191658230 <redacted> + 92
2015-05-03 19:28:08.564 Baru[5549:638056] critical:     26  WebCore                             0x0000000191658190 <redacted> + 1588
2015-05-03 19:28:08.564 Baru[5549:638056] critical:     27  WebKitLegacy                        0x00000001924d0a34 <redacted> + 228
2015-05-03 19:28:08.564 Baru[5549:638056] critical:     28  CoreFoundation                      0x0000000182d5a100 <redacted> + 144
2015-05-03 19:28:08.565 Baru[5549:638056] critical:     29  CoreFoundation                      0x0000000182c562fc <redacted> + 296
2015-05-03 19:28:08.565 Baru[5549:638056] critical:     30  CoreFoundation                      0x0000000182c5ae30 <redacted> + 68
2015-05-03 19:28:08.565 Baru[5549:638056] critical:     31  WebKitLegacy                        0x00000001924c0898 <redacted> + 172
2015-05-03 19:28:08.565 Baru[5549:638056] critical:     32  CoreFoundation                      0x0000000182d57f6c <redacted> + 440
2015-05-03 19:28:08.565 Baru[5549:638056] critical:     33  CoreFoundation                      0x0000000182c5accc _CF_forwarding_prep_0 + 92
2015-05-03 19:28:08.565 Baru[5549:638056] critical:     34  CoreFoundation                      0x0000000182d5a100 <redacted> + 144
2015-05-03 19:28:08.566 Baru[5549:638056] critical:     35  CoreFoundation                      0x0000000182c562fc <redacted> + 296
2015-05-03 19:28:08.566 Baru[5549:638056] critical:     36  WebCore                             0x0000000191666efc <redacted> + 120
2015-05-03 19:28:08.566 Baru[5549:638056] critical:     37  CoreFoundation                      0x0000000182d0c240 <redacted> + 24
2015-05-03 19:28:08.569 Baru[5549:638056] critical:     38  CoreFoundation                      0x0000000182d0b4e4 <redacted> + 264
2015-05-03 19:28:08.569 Baru[5549:638056] critical:     39  CoreFoundation                      0x0000000182d09594 <redacted> + 712
2015-05-03 19:28:08.569 Baru[5549:638056] critical:     40  CoreFoundation                      0x0000000182c352d4 CFRunLoopRunSpecific + 396
2015-05-03 19:28:08.570 Baru[5549:638056] critical:     41  GraphicsServices                    0x000000018c44b6fc GSEventRunModal + 168
2015-05-03 19:28:08.570 Baru[5549:638056] critical:     42  UIKit                               0x00000001877fafac UIApplicationMain + 1488
2015-05-03 19:28:08.570 Baru[5549:638056] critical:     43  Baru                                0x0000000100140d2c wrapper_managed_to_native_UIKit_UIApplication_UIApplicationMain_int_string___intptr_intptr + 348
2015-05-03 19:28:08.571 Baru[5549:638056] critical:     44  Baru                                0x000000010010b82c UIKit_UIApplication_Main_string___intptr_intptr + 44
2015-05-03 19:28:08.572 Baru[5549:638056] critical:     45  Baru                                0x000000010010b7ec UIKit_UIApplication_Main_string___string_string + 172
2015-05-03 19:28:08.572 Baru[5549:638056] critical:     46  Baru                                0x00000001000cc11c Baru_Application_Main_string__ + 156
2015-05-03 19:28:08.573 Baru[5549:638056] critical:     47  Baru                                0x0000000100267444 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 180
2015-05-03 19:28:08.573 Baru[5549:638056] critical:     48  Baru                                0x00000001003faea4 mono_jit_runtime_invoke + 1260
2015-05-03 19:28:08.573 Baru[5549:638056] critical:     49  Baru                                0x0000000100448cc4 mono_runtime_invoke + 128
2015-05-03 19:28:08.574 Baru[5549:638056] critical:     50  Baru                                0x000000010044cf50 mono_runtime_exec_main + 404
2015-05-03 19:28:08.574 Baru[5549:638056] critical:     51  Baru                                0x00000001004aed8c xamarin_main + 1844
2015-05-03 19:28:08.574 Baru[5549:638056] critical:     52  Baru                                0x00000001003515b8 main + 96
2015-05-03 19:28:08.575 Baru[5549:638056] critical:     53  libdyld.dylib                       0x0000000194bf6a08 <redacted> + 4
2015-05-03 19:28:08.575 Baru[5549:638056] critical: 
=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries 
used by your application.
=================================================================

Answer 1

看起来不错。请参考我的代码以在加载过程中显示进度条。 可能是

1)请检查网络连接 2) 在 appdelege 中调试超过 12 秒会使应用程序崩溃

string url = "http://manikandan.azurewebsites.net";

         //Web View
        webView.ShouldStartLoad += HandleShouldStartLoad;//Handle every url loads in webview
        webView.LoadRequest (new NSUrlRequest (new NSUrl (url)));//Load Url in the same view
        webView.LoadStarted += ProgressbarLoad;//Show progress bar while loading webview

void ProgressbarLoad (object sender, EventArgs e)
        {


            // Determine the correct size to start the overlay (depending on device orientation)
            var bounds = UIScreen.MainScreen.Bounds; // portrait bounds
            if (UIApplication.SharedApplication.StatusBarOrientation == UIInterfaceOrientation.LandscapeLeft || UIApplication.SharedApplication.StatusBarOrientation == UIInterfaceOrientation.LandscapeRight) {
                bounds.Size = new SizeF(bounds.Size.Height, bounds.Size.Width);
            }
            // show the loading overlay on the UI thread using the correct orientation sizing
            this._loadPop = new LoadingOverlay (bounds);
            this.View.Add ( this._loadPop );

        }