我正在开发一个iphone应用程序，我从CCMenu中删除所有项目时遇到问题。问题是当调用CCMenuItem的选择器时，我删除触发选择器的项目并且应用程序崩溃。
代码（在CCLayer中）：
-(void) clearAll
{
[popupMenu removeAllChildrenWithCleanup:YES];
}
-(void) onButtonClick:(id) sender
{
[self clearAll];
}
-(void) createButtons
{
CCMenuItemImage * menuItem = [CCMenuItemImage itemFromNormalImage:@"back_button.png" selectedImage:@"back_button.png" target:self selector:@selector(onButtonClick:)];
[popupMenu addChild: menuItem];
}
有谁知道应用程序崩溃的原因以及如何解决此问题？
由于
更新：
崩溃邮件堆栈跟踪：
0x01abaabc in __NSI3 ()
0x01a9f495 in -[NSInvocation invoke] ()
0x0006852f in -[CCMenuItem activate] at /***/cocos2d/CCMenuItem.m:128
0x00068d80 in -[CCMenuItemLabel activate] at /***/cocos2d/CCMenuItem.m:222
0x00065c24 in -[CCMenu ccTouchEnded:withEvent:] at /***/cocos2d/CCMenu.m:196
0x01b3ae99 in -[NSObject performSelector:withObject:withObject:] ()
0x000bb44d in -[CCTouchDispatcher touches:withEvent:withTouchType:] at /***/cocos2d/Platforms/iOS/CCTouchDispatcher.m:268
0x000bbfa3 in -[CCTouchDispatcher touchesEnded:withEvent:] at /***/cocos2d/Platforms/iOS/CCTouchDispatcher.m:337
0x000bdd5e in -[EAGLView touchesEnded:withEvent:] at /***/cocos2d/Platforms/iOS/EAGLView.m:330
0x009d63c0 in -[UIWindow _sendTouchesForEvent:] ()
0x009d65e6 in -[UIWindow sendEvent:] ()
0x009bcdc4 in -[UIApplication sendEvent:] ()
0x009b0634 in _UIApplicationHandleEvent ()
0x03589ef5 in PurpleEventCallback ()