“在非成员函数中使用'this'无效”在客观方面？ [英] "Invalid use of 'this' in non-member function" in objective-c context?

问题描述

使用Xcode。

在此代码中（func在接口中声明），告诉subj错误，站在带有'self'的字符串上。

In this code (func is declared in interface), tells subj error, standing on string with 'self'.

+ (void) run: (Action) action after: (int) seconds 
{
    [self run:action after:seconds repeat:NO];
}

什么......？

推荐答案

self 是一个实例变量，用于引用当前对象的实例。

self is an instance variable used to refer to an instance of the current object.

您正试图在类级别方法中使用它 +（void）... 其中 self 没有意义。尝试使用共享实例，或将有问题的类的实例传递给方法。

You are attempting to use it in a class level method +(void)... where self has no meaning. Try using a shared instance, or passing an instance of the class in question to the method.

+ (void) run:(Action)action on:(MyClass*) instance after:(int) seconds
{ 
    [instance run:action after:seconds repeat:NO];
}

编辑

我的评论者指出 self 在类级别上下文中确实有意义，但它指的是类本身。这意味着你试图调用一个如下所示的方法：

My commenters have pointed out that self does have meaning in class level contexts, but it refers to the class itself. That would mean you were trying to call a method that looks like this:

 [MyClass run:action after:seconds repeat:NO];

您的目标应该是：

 [myClassInstance run:action after:seconds repeat:NO];

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