无法将 UIViewController 子类添加到 NSDictionary

发布于 2025-01-02 02:45:50 字数 740 浏览 1 评论 0原文

我不想将 UIViewController 的子类添加到 NSMutableDictionary 中，这应该没有问题，因为 UIViewController 是一个 NSObject。

这是我的代码：

NSArray *requestingPathes = [[NSArray alloc] initWithObjects:indexPath, nil];
requestingPair = [[NSMutableDictionary alloc] initWithObjectsAndKeys:requestingPathes, dele, nil];

当使用委托“dele”（恰好是提到的子类）初始化字典“requestingPair”时，应用程序崩溃。

错误是：

-[MainViewController copyWithZone:]: unrecognized selector sent to instance 0x7446b30
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MainViewController copyWithZone:]: unrecognized selector sent to instance 0x7446b30

0x7446b30是子类“MainViewController”的地址。

为什么会出现这种情况？

原文

I wan't to add a subclass of UIViewController to a NSMutableDictionary which should be no problem since UIViewController is a NSObject.

This is my code:

NSArray *requestingPathes = [[NSArray alloc] initWithObjects:indexPath, nil];
requestingPair = [[NSMutableDictionary alloc] initWithObjectsAndKeys:requestingPathes, dele, nil];

The app crashes when the delegate "dele" (which happens to be the mentioned subclass) is used to initialize the Dictionary "requestingPair".

The error is:

-[MainViewController copyWithZone:]: unrecognized selector sent to instance 0x7446b30
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[MainViewController copyWithZone:]: unrecognized selector sent to instance 0x7446b30

0x7446b30 is the address of the subclass "MainViewController.

Why is this happening?

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农村范ル 2025-01-09 02:45:50

-initWithObjectsAndKeys： 需要一个对象和键的列表，按该顺序交替出现：对象、键、对象、键、nil。您正在做的就是尝试将您的 dele 对象作为键，从中可以检索值 requestingPathes ； NSDictionary 对象在设置它们时会复制它们的键，并且您的视图控制器不支持复制，因此这是失败的。想必您想要做的事情更像是这样：

requestingPair = [[NSMutableDictionary alloc] initWithObjectsAndKeys:requestingPathes, @"paths", dele, @"delegate", nil];

然后您可以通过调用 [requestingPair objectForKey:@"delegate"] 和带有 [requestPair objectForKey:@" 的路径来检索委托对象路径”]。

-initWithObjectsAndKeys: expects a list of objects and keys, in that order—alternating object, key, object, key, nil. What you’re doing is trying to give it your dele object as a key from which the value requestingPathes can be retrieved; NSDictionary objects copy their keys when you set them, and your view controller doesn’t support being copied, so that’s failing. Presumably what you want to do is something more like this:

requestingPair = [[NSMutableDictionary alloc] initWithObjectsAndKeys:requestingPathes, @"paths", dele, @"delegate", nil];

You can then retrieve the delegate object by calling [requestingPair objectForKey:@"delegate"] and the paths with [requestPair objectForKey:@"paths"].

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