Objc - Extension - TableView Delegate - objective-c

Question

I am trying to follow the Viper pattern in a small objc project. I get the different roles of each part with no particular issue.
However, the part I have an issue with is when I try to move the delegate/datasource of my tableview to another file, because I read that this is how it's supposed to be done.
I followed that post: iOS using VIPER with UITableView but I can't manage to compile.
This issue here is that I have no idea on how to make an extension in Objc. I tried a lot of syntaxes, but none of them worked.
How (by example) would I properly have in VIPER "MyViewController.m/h" & "MyTableViewController.m/h" where "MyTableViewController" is an extension of "MyViewController"?
Meaning that we would see <UITableViewDelegate> in "MyViewController.h".
Thanks a lot for your help. This is probably a redundant question but I didn't manage to find a clear answer, if any, to my extension issue.

Answer 1

Thanks to #Kamil.S in the comment above, I manage to find what I wanted in the apple documentation!
Indeed, extensions in Objc are called "Categories". I pretty much did what was written on the post I linked in my original question.
So here's a simplified example if anyone needs it:
ViewController.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
#property (strong, nonatomic) id<ViewToPresenterProtocol> presenter;
#end
ViewController.m
#import "ViewController.h"
#implementation ViewController
// All my code, ViewDidLoad, and so on
#end
CollectionViewController.h
#import <UIKit/UIKit.h>
#import "ViewController.h"
#interface ViewController (CollectionViewController) <UICollectionViewDelegate, UICollectionViewDataSource>
#end
CollectionViewController.m
#import <UIKit/UIKit.h>
#import "CollectionViewController.h"
#import "ViewController.h"
#implementation ViewController (CollectionViewController)
- (NSInteger)collectionView:(nonnull UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return [self.presenter getNumberOfItems];
}
// ...
// Here add others functions for CollectionView Delegate/Datasource protocols
#end