我可以使用类方法作为委托回调 [英] Can I use a class method as a delegate callback

问题描述

在类方法方法中，我声明如下：

In a class method method I declare the following:

    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Hello" 
                                                   message:@"World"
                                                  delegate:self
                                         cancelButtonTitle:@"Cancel" 
                                         otherButtonTitles:@"Done", nil];

现在即使contains方法是一个类方法，编译器也不会抱怨 delegate：self 。现在要成为委托，我必须实现 UIAlertViewDelegate 协议中的方法。

Now even though the containing method is a class method, the compiler does not complain about the delegate:self. Now to be the delegate I have to implement the method in UIAlertViewDelegate protocol.

方法是否为类方法，以便在用户与我的AlertView交互时调用？

Does it now matter, if the method is a class method or not, in order to be called when the user interacts with my AlertView?

我问这个问题，因为我的类没有任何实例

I am asking this question, because my class does not have any instance variables so I would prefer it to contain class methods only.

推荐答案

首先，我假设通过静态方法，你的意思是类方法（用 + 而不是 - ）声明。

First, I assume by "static" methods, you mean class methods (declared with + instead of -).

编译器不抱怨关于Objective-C并不总是告诉你很多。这真的意味着，你已经说服了编译器一切应该（或至少可以）在运行时工作。

"The compiler does not complain" about Objective-C doesn't always tell you much. All it really means is that you have convinced the compiler that everything should (or at least could) work at runtime.

如果你作为一个委托提供的对象响应正确的消息，编译器不会关心它是一个类（运行时也不会）。在这种情况下，您将从类方法提供 self 。它就像你输入 [MyClass class] 。

In the end, if the object you provide as a delegate responds to the right messages, the compiler won't care that it's a class (and neither will the runtime). In this case, you are providing self from a class method. It is as though you typed [MyClass class].

我认为这可能是有问题的， em>应该做 - 但这可能在你的问题的边界之外。

I think it's probably questionable whether this is what you should do--but that's probably outside the bounds of your question.

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