发布通知时出现 NSInvalidArgumentException

发布于 2024-11-04 21:56:53 字数 925 浏览 4 评论 0原文

我正在尝试使用通知系统，以便在 Splitviewcontroller 中拥有详细视图来更新表视图。我声明通知如下：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(pushView:) name:@"pushView" object:nil];

和选择器本身：

- (void) pushView:(UIViewController *) viewController {
    [self.navigationController pushViewController:viewController animated:YES];
}

现在，在详细视图中，我创建视图控制器并调用创建通知：

   ArticleTableViewController *articleTableView  = [[ArticleTableViewController alloc] initWithCategory:catInt];

   [[NSNotificationCenter defaultCenter] postNotificationName:@"pushView" object:articleTableView];

我认为这会起作用，但我收到错误：

* 由于未捕获而终止应用程序例外 'NSInvalidArgumentException'，原因： '-[NSConcreteNotification 设置ParentViewController：]：无法识别的选择器发送到实例 0x5a3a290'

所以我想我在如何将detailViewController包含在用于推送的通知中做错了。

原文

I am trying to use the notification system in order to have a detail view in a Splitviewcontroller to update the tableview. I declared the notification as follows:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(pushView:) name:@"pushView" object:nil];

and the selector itself:

- (void) pushView:(UIViewController *) viewController {
    [self.navigationController pushViewController:viewController animated:YES];
}

Now, in the detailview I create the view-controller and call create the notification:

   ArticleTableViewController *articleTableView  = [[ArticleTableViewController alloc] initWithCategory:catInt];

   [[NSNotificationCenter defaultCenter] postNotificationName:@"pushView" object:articleTableView];

I assumed that that would work, but I get the error:

* Terminating app due to uncaught
exception
'NSInvalidArgumentException', reason:
'-[NSConcreteNotification
setParentViewController:]:
unrecognized selector sent to instance
0x5a3a290'

So I guess I am doing something wrong in how including the detailViewController in the notification to be used to push in.

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

猫腻 2024-11-11 21:56:54

处理通知的方法定义似乎是错误的。

- (void) pushView:(UIViewController *) viewController

应该是，

- (void) pushView:(NSNotification *) notification

实际的通知作为参数传递，而不是任何视图控制器。要实现您想要的目标，请尝试以下操作。

- (void) pushView:(NSNotification *) notification

    NSDictionary *userInfo = [notification userInfo];
    UIViewController *viewController = (UIViewController *)[userInfo objectForKey:@"ViewController"];
    [self.navigationController pushViewController:viewController animated:YES];
}

并且在发布通知的同时，

    ArticleTableViewController *articleTableView  = [[ArticleTableViewController alloc] initWithCategory:catInt];
    NSDictionary *userInfo = [NSDictionary dictionaryWithObject:articleTableView forKey:@"ViewController"];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"pushView" object:nil userInfo:userInfo];

The method definition for handling the notification seems to be wrong.

- (void) pushView:(UIViewController *) viewController

should be,

- (void) pushView:(NSNotification *) notification

The actual notification is passed as the argument, not any view controllers. To achieve what you want, try the following.

- (void) pushView:(NSNotification *) notification

    NSDictionary *userInfo = [notification userInfo];
    UIViewController *viewController = (UIViewController *)[userInfo objectForKey:@"ViewController"];
    [self.navigationController pushViewController:viewController animated:YES];
}

And while posting the notification,

    ArticleTableViewController *articleTableView  = [[ArticleTableViewController alloc] initWithCategory:catInt];
    NSDictionary *userInfo = [NSDictionary dictionaryWithObject:articleTableView forKey:@"ViewController"];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"pushView" object:nil userInfo:userInfo];

回复收藏 0 原文

~没有更多了~