NSInvalidArgumentException

Question

添加：（id）發件人後，我收到了此例程的崩潰，因此我可以確定哪個按鈕調用了它。當設置爲普通舊版toggleView3時，它可以很好地工作。當detailView切換回docView時發生崩潰。

'NSInvalidArgumentException', reason: '*** -[RootViewController toggleView3]: unrecognized selector sent to instance 0x524a00' 2009-04-07 12:29:44.421 eTarot[11405:20b] Stack:

-(IBAction)toggleView3:(id)sender{ 


    if (detailViewController == nil) { 
     [self loadDetailViewController]; 
    } 

    UIView *docView = docViewController.view; 
    UIView *detailView = detailViewController.view; 

    [UIView beginAnimations:nil context:NULL]; 
    [UIView setAnimationDuration:1]; 
    [UIView setAnimationTransition:([docView superview] ? UIViewAnimationTransitionFlipFromRight : UIViewAnimationTransitionFlipFromLeft) forView:self.view cache:YES]; 

    if ([docView superview] != nil) { 
     [detailViewController viewWillAppear:YES]; 
     [docViewController viewWillDisappear:YES]; 
     [docView removeFromSuperview]; 

     [self.view addSubview:detailView]; 
     [self.view insertSubview:detailNavigationBar aboveSubview:detailView]; 
     [docViewController viewDidDisappear:YES]; 
     [detailViewController viewDidAppear:YES]; 

    } else { 
     [docViewController viewWillAppear:YES]; 
     [detailViewController viewWillDisappear:YES]; 
     [detailView removeFromSuperview]; 
     [detailNavigationBar removeFromSuperview]; 
     [self.view addSubview:docView]; 
     [detailViewController viewDidDisappear:YES]; 
     [docViewController viewDidAppear:YES]; 
    } 
    [UIView commitAnimations]; 
} 

Answer 1

當正確的選擇器名稱是toggleView3: - 即冒號和參數時，您正在發送視圖toggleView3。它們可能看起來與你類似，但它們與Objective-C完全不同。

Answer 2

這異常意味着您的應用程序而無需調用toggleView3：發件人的說法地方。由於您的新方法需要參數，因此與調用從未存在的方法相同。

如果您在調試器中查看堆棧跟蹤，應該很清楚它來自哪裏。構建結果中也可能有警告。