NSInvalidArgumentException

Question

在添加了：(Id)发送者之后，我在这个例程中遇到了崩溃，这样我就可以确定是哪个按钮调用了它。当设置为普通的老式toggleView3时，它可以完美地工作。当将detailView切换回docView时，会发生崩溃。

'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

当选择器的正确名称是toggleView3: -即带有冒号和参数时，您将向视图发送消息toggleView3。它们可能看起来与你很相似，但它们与Objective-C完全不同。

Answer 2

该异常意味着您的应用程序在调用toggleView3时没有在某处使用:sender参数。由于您的新方法需要一个参数，因此它与调用一个从未存在的方法是一样的。

如果您查看调试器中的堆栈跟踪，它应该非常清楚它来自哪里。在构建结果中可能也有一个警告。