爲什麼在單擊時更新sqlite上的行時會出現異常？

Question

我有一個簡單的表，當我嘗試在SQLite的更新行，應用程序關閉並揭露此異常：

Stacktrace: 

    at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <0xffffffff> 
    at MonoTouch.UIKit.UIApplication.Main (string[],string,string) <0x000b7> 
    at RemedioNaHora.Application.Main (string[]) <0x00017> 
    at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <0xffffffff> 

Native stacktrace: 

    0 RemedioNaHora      0x000908ec mono_handle_native_sigsegv + 284 
    1 RemedioNaHora      0x00005c88 mono_sigsegv_signal_handler + 248 
    2 libsystem_c.dylib     0x9365c59b _sigtramp + 43 
    3 ???         0xffffffff 0x0 + 4294967295 
    4 UIKit        0x0219355a -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61 
    5 UIKit        0x02238b76 -[UIControl sendAction:to:forEvent:] + 66 
    6 UIKit        0x0223903f -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 503 
    7 UIKit        0x0238aa6c -[_UISwitchInternalView _sendActions] + 121 
    8 Foundation       0x0173786d __NSFireDelayedPerform + 389 
    9 CoreFoundation      0x01195966 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 22 
    10 CoreFoundation      0x01195407 __CFRunLoopDoTimer + 551 
    11 CoreFoundation      0x010f87c0 __CFRunLoopRun + 1888 
    12 CoreFoundation      0x010f7db4 CFRunLoopRunSpecific + 212 
    13 CoreFoundation      0x010f7ccb CFRunLoopRunInMode + 123 
    14 GraphicsServices     0x04789879 GSEventRunModal + 207 
    15 GraphicsServices     0x0478993e GSEventRun + 114 
    16 UIKit        0x02190a9b UIApplicationMain + 1175 
    17 ???         0x0b5b9784 0x0 + 190551940 
    18 ???         0x0b5b89d0 0x0 + 190548432 
    19 ???         0x0b5b8878 0x0 + 190548088 
    20 ???         0x0b5b8907 0x0 + 190548231 
    21 RemedioNaHora      0x00009ff2 mono_jit_runtime_invoke + 722 
    22 RemedioNaHora      0x00169eee mono_runtime_invoke + 126 
    23 RemedioNaHora      0x0016dfd4 mono_runtime_exec_main + 420 
    24 RemedioNaHora      0x001733f5 mono_runtime_run_main + 725 
    25 RemedioNaHora      0x000671f5 mono_jit_exec + 149 
    26 RemedioNaHora      0x002116c9 main + 2825 
    27 RemedioNaHora      0x00003045 start + 53 

================================================================= 
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. 
================================================================= 

是否有人知道發生了什麼事？

Answer 1

它看起來像一個UISwitch調用回託管代碼。它可能是：

• 調用一個已經被垃圾回收的對象（它被釋放並且不能再被使用）。確保你保持對正在使用的對象的參考可以解決這個問題;或者

• 它也可以調用主線程外的UI元素。確保UI元素僅用於主線程將解決這種情況。

希望這會幫助你。如果沒有，我們需要看到一些源代碼，以進一步幫助你。你可以編輯你的問題來添加它。