如何在 Objective-C 中覆盖可变参数方法 [英] How to override a variadic method in Objective-C

问题描述

我正在尝试扩展一个具有可变参数方法的类，例如:

I'm trying to extend a class that has a variadic method such as:

- (void)someMethod:(id)arguments, ... ;

并在子类中通过调用原始方法覆盖它，例如:

and in the subclass override it by calling the original method like:

- (void)someMethod:(id)arguments, ... {
    [super someMethod:arguments, ...];

    // override implementation
    ...
}

但这不起作用.有谁知道如何工作?谢谢.

but this doesn't work. Anyone know how to work this? Thanks.

推荐答案

类似于printf/vprintf，base会声明:

similar to printf/vprintf, the base would declare:

- (void)someMethod:(id)arguments, ... ;

子类将实现:

- (void)vsomeMethod:(id)arguments vaList:(va_list)vaList;

然后基础将在其 someMethod:vaList: 的实现中调用 vsomeMethod:vaList:.

then the base would just call vsomeMethod:vaList: in its implementation of someMethod:vaList:.

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