应用程序委托发出警告：“id”不符合“UIAlertViewDelegate”协议

发布于 2024-09-28 22:39:35 字数 199 浏览 2 评论 0原文

我目前在我的应用程序中启动时使用 UIAlertView 和 UIAlertViewDelegate。一切都很好。唯一的问题是，每次引用 App Delegate 时，我都会收到警告“type 'id '不符合 'UIAlertViewDelegate' 协议”，这给了我大约 32 个警告。

谁能解释一下我为什么收到此警告以及如何满足它？

提前致谢！

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清旖 2024-10-05 22:39:35

我假设您的应用程序委托是您的警报视图委托？

如果是这样，您需要在应用程序委托的声明中告诉编译器。像这样：

@interface SomeAppDelegate : NSObject <UIApplicationDelegate, UIAlertViewDelegate> {

}

// ... rest of interface

@end

然后你还需要实现所需的方法。

编辑：进一步考虑一下，我认为当您引用应用程序委托时，您可能错过了演员表。所以你有这样的东西：

MyAppDelegate* appDelegate = [[UIApplication sharedApplication] delegate];

// what you want is:

MyAppDelegate* appDelegate = (MyAppDelegate*)[[UIApplication sharedApplication] delegate];

I assuming your app delegate is your alert view delegate?

If so, you need to tell the compiler that in the declaration of the app delegate. Like so:

@interface SomeAppDelegate : NSObject <UIApplicationDelegate, UIAlertViewDelegate> {

}

// ... rest of interface

@end

And then you also need to implement the required methods.

EDIT: Thinking about it further, I think probably you're missing a cast when you reference the app delegate. So you have something like this:

MyAppDelegate* appDelegate = [[UIApplication sharedApplication] delegate];

// what you want is:

MyAppDelegate* appDelegate = (MyAppDelegate*)[[UIApplication sharedApplication] delegate];

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权谋诡计 2024-10-05 22:39:35

它可能不存在于主线程上，请尝试

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"My Title"
                                                    message:@"My message"
                                                   delegate:self cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
[alertView performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:NO];

It might not exist on the main thread, try

UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"My Title"
                                                    message:@"My message"
                                                   delegate:self cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
[alertView performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:NO];

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