Question

有人知道我为什么会收到这个错误吗？

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CustomRaisedTabViewController cancel:]: unrecognized selector sent to instance 0x4d321e0'

这是失败的代码。这是我的CustomTabViewController。单击“取消”按钮时发生错误。

-(IBAction)showPostModalViewController {

PostActionModalViewController *addController = [[PostActionModalViewController alloc] 
                                                initWithNibName:@"PostActionModalView" bundle:nil];

// Configure the PostAddViewController. In this case, it reports any
// changes to a custom delegate object.

addController.delegate = self;



// Create the navigation controller and present it modally.

UINavigationController *navigationController = [[UINavigationController alloc]
                                                initWithRootViewController:addController];

[self presentModalViewController:navigationController animated:YES];

UIBarButtonItem *cancelButton =
[[UIBarButtonItem alloc] initWithTitle: @"Cancel"
                                 style: UIBarButtonItemStylePlain
                                target: self
                                action: @selector(cancel:)];
addController.navigationItem.rightBarButtonItem = cancelButton;
[cancelButton release];


//[self presentModalViewController:addController animated:true];
[navigationController release];

[addController release];
}

-(IBAction)cancel {
    [self.parentViewController dismissModalViewControllerAnimated:YES];
}

Answer 1

因为cancel:方法不是您定义的cancel。

将您的cancel操作更改为：

- (IBAction)cancel:(id)sender {
    ...
}

Answer 2

action: @selector(cancel:)

对于带参数的动作选择器！取消：这意味着哪个将采用另一个参数。

将您的方法更改为

-(IBAction)cancel:(id)sender{
// Do wat you want
}

or

-(IBAction)cancel:(UIButton *)btnSender{
/// Do what you want
}

Answer 3

您必须修改

中的取消方法签名

-(IBAction)cancel:(id)sender
 { 
   [self.parentViewController dismissModalViewControllerAnimated:YES]; 
 }

当您将操作添加到cancelButton时（在初始化期间），您指定了“cancel：”选择器，这意味着它将被称为具有一个参数的方法（发送者按钮）

无法识别的选择器发送到实例

3 个答案: