Objective-C:我应该声明私有方法吗? [英] Objective-C: Should I declare private methods?

问题描述

根据

I've been declaring private methods in class extensions, according to Best way to define private methods for a class in Objective-C.

但是，我刚刚意识到，在Xcode 4中，如果我完全忽略了私有方法的声明并仅实现了它，则该应用程序将编译并运行，而不会发出警告或错误.

But, I just realized that, in Xcode 4, if I leave out the declaration of a private method altogether and just implement it, the app compiles and runs without warning or error.

那么，我是否还要在类扩展中声明私有方法?

So, should I even bother declaring private methods in class extensions?

为什么我们仍然必须声明方法?在Java中，您不会...在Ruby中也不会.

Why should we have to declare methods anyway? In Java, you don't... neither in Ruby.

推荐答案

仅当在方法之前声明了调用方时，才需要定义方法定义.为了保持一致，我建议在扩展中定义您的私有方法.

A method definition only needs to be defined if the caller is declared before the method. For consistency I would recommend defining your private methods in the extension.

-(void)somemethod
{
}

-(void)callermethod
{
    //No warning because somemethod was implemented already
    [self somemethod];
}

-(void)callermethod2
{
    //Warning here if somemethod2 is not defined in the header or some extension
    [self somemethod2];
}

-(void)somemethod2
{
}

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