xcode 这个函数声明中的“-(void)”是什么意思？`-(void)awakeFromNib`
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What does "-(void)" mean in this function declaration? `-(void)awakeFromNib`
提问by nambvarun
How come whenever I have to use awakeFromNib protocol I have to put it in this format?
为什么每当我必须使用awakeFromNib 协议时，我都必须将它放在这种格式中？
-(void)awakeFromNib
What is the need for -(void)?
-(void) 需要什么？
回答by UncleO
The -(void)is used in the declaration of the method. Presumably, you are defining it for someone else to call, rather than calling it yourself.
的-(void)是在该方法的声明中使用。据推测，您正在定义它以供其他人调用，而不是自己调用。
The -sign indicates that the method is an instance method, as opposed to a class method. It requires an object to call it, and instance variables of the object are available to it inside its definition.
的-符号表示，该方法是一个实例方法，相对于一个类的方法。它需要一个对象来调用它，并且该对象的实例变量在其定义中可供它使用。
The (void)indicates the return type. This method doesn't return anything, so its result can't be assigned to anything.
该(void)指示返回类型。这个方法不返回任何东西，所以它的结果不能分配给任何东西。
回答by Dean
think of it this way
这样想
say you have a Class you created that is called "Math"
假设您创建了一个名为“Math”的类
and this class has a method called "calculate". It's type as
这个类有一个叫做“calculate”的方法。它的类型为
-(int)calculate {
2+2;
return 2+2;
}
When you alloc the class and initialize the object and perform the "calculate method on that object, it's going to do the calculation 2+2 and it will return the result, 4.
当您分配类并初始化对象并对该对象执行“计算方法”时，它将执行计算 2+2 并返回结果 4。
If you tried
如果你试过
-(void)calculate {
2+2;
}
it wouldn't do anything, it would just have that 2+2 information stored in the method but the calculation would never occur.
它不会做任何事情，它只会在方法中存储 2+2 信息，但永远不会发生计算。
回答by Chuck
Because the method does not return anything, and giving a void return type is how you declare that in C and Objective-C.
因为该方法不返回任何内容，并且给出 void 返回类型是您在 C 和 Objective-C 中声明的方式。
回答by Steven Schlansker
(void) marks the return type - in this case, void means it's returning nothing.
(void) 标记返回类型 - 在这种情况下，void 表示它不返回任何内容。
If it was instead -(int)awakeFromNib, you'd be expected to return an integer. The meaning of the return value (if any) should be explained in the documentation.
如果它是 -(int)awakeFromNib，你应该返回一个整数。应该在文档中解释返回值（如果有）的含义。
