NSWindow keyDown：崩潰

Question

在我的應用程序中，我繼承了NSWindow類。這是爲了覆蓋默認的按鍵事件。

//mywindow.h 
@interface TWindow: NSWindow 
{ 
} 

- (void)keyDown: (NSEvent *)pEvent; 
@end 


//mywindow.mm 
- (void)keyDown:(NSEvent *)theEvent 
{ 
    //Detect Control-W and Control-Q and handle them. 
    unsigned short keycode;  ///< Key code. 
    NSString *  charigmtch;  ///< Character ignoring matches. 
    NSString *  character; 
    BOOL   cmdkeydown;  ///< check if the command key is down. 
    BOOL   shiftkeydown; ///< Check if shift key is down. 

    //Get the keycode of Control-W 
    keycode  = [theEvent keyCode]; 

    //get character ignoring match. 
    charigmtch = [theEvent charactersIgnoringModifiers]; 

    //get character 
    character = [theEvent characters]; 

    cmdkeydown  = ([[NSApp currentEvent] modifierFlags] & NSCommandKeyMask) == NSCommandKeyMask; 
    shiftkeydown = ([[NSApp currentEvent] modifierFlags] & NSShiftKeyMask) == NSShiftKeyMask; 
    //Get the keycode of Control 
    if(cmdkeydown && 12 == keycode && ![character compare:@"q"] && ![charigmtch compare:@"q"]) { 

     //CloseWithConfirm shows message box confirming quit. 
     [self CloseWithConfirm]; 

    } else if (keycode == 48) { 
     //Tab key is pressed. 

      //This AppDelegate is application delegate and also NSWindowDelegate. 
      AppDelegate * delegate;  ///< Delegate. 

     //Get the delegate from the window. 
     delegate = (AppDelegate *)[self delegate]; 

     //Shift key is not down. 
     if(!shiftkeydown) { 
      //Tab key is pressed. 
      [delegate TabKeyPressed]; 
     } else { 
      //Shift-Tab key is pressed. 
      [delegate ShiftTabKeyPressed]; 
     } 
    } 


    //Handle the other key. 
    [super keyDown:theEvent]; //Line E 
} 

當我運行下面的示例測試案例：

void TestCase() 
{ 
    MyThread thread1, thread2, thread3, thread4; 

    //Run thread 1 
    thread1.Execute(); 

    //Run thread 2 
    thread2.Execute(); 

    //Run thread 3 
    thread3.Execute(); 

    //Run thread 4 
    thread4.Execute(); 

} 

//Following function is executed in thread function. 
void Perform() 
{ 
    //This adds the data in table view. 
    AddRowInTableView ("Test"); 
} 

此代碼運行罰款大部分的時間。但有時候，它會在代碼中標出的E行崩潰。 我無法找到這次崩潰的原因。誰能幫我？

我正在使用Mac OS X Mavericks預覽版和Xcode 5進行調試和構建。

Answer 1

不要更新輔助線程中的UI。所有繪圖和UI事件都必須在主線程上處理。