Question

I have for example this method:

-(void)customSum {
NSLog(@"show something");
}

in HomeView.m and I want to call that method in all other files, for example in ArticleView.m. Can I do something like:

[HomeView customSum];

or something similar? How can I do that?

Answer 1

It doesn’t sound like are trying to subclass anything (which would be why people are mentioning inheritance). If you are, than see the other answers.

The obj-c way to do this would be the following: you want to have HomeView.h declare an interface for a class HomeView, and have the method be either a class method or an instance method. Like so:

    @interface HomeView : UIView
    - (void)anInstanceMethod;
    + (void)aClassMethod;
    @end

I’m assuming since these are”views” you are deriving from UIView.
Then you would have HomeView.m implementing the method:

    @implementation HomeView
    - (void)anInstanceMethod
    {
        // Do Something
    }
    + (void)aClassMethod
    {
        // Do Something else
    }
    @end

Then, in ArticlViewe.m (Where you have an implementation of a class ArticleView declared in ArticleView.h (This is the standard way to do it, though you can put in an interface in a .m file, but you don’t wan’t to include a .m file, so the class wouldn’t be visible outside the file).

    #include "HomeView.h"

    ...
        [HomeView aClassMethod]; // Call the class method on the class
        HomeView *homeView = [HomeView new];
        [homeView anInstanceMethod]; // Call the instance method on an instance
    ...

If this is all new to you, you should probably get a book on Objective-C and iOS development.