Breaking down a large class into categories in objective-c?

Question

Objective-C

There is a PlayerViewController class with a large number of methods, I want to break it into categories, but I don’t understand how to do it so that by connecting PlayerViewController.h methods from all its categories are available.
As tried:
I create category Timer.

//
// PlayerViewController+Timer.h
//

@interface PlayerViewController (Timer)

- (void)testMethod;

@end

//
//PlayerViewController+Timer.m
//

#import "PlayerViewController.h"
#import "PlayerViewController+Timer.h"

@implementation PlayerViewController (Timer)

- (void) testMethod
{
    NSLog(@"test");
}

@end

In the main class I am now trying to call the testMethod method from the category:

//
//  PlayerViewController.h
//

#import <Foundation/Foundation.h>
#import "PlayerViewController+Timer.h"

@interface PlayerViewController : UIViewController
    
@end

//
//  PlayerViewController.m
//

#import "PlayerViewController.h"

@implementation PlayerViewController

- (void)viewDidLoad
{
    [self testMethod];
}

@end

Errors:

/Users/user/Desktop/Projects/SplitClass/PlayerViewController+Timer.h:5:12: Cannot define category for undefined class 'PlayerViewController'
/Users/user/Desktop/Projects/SplitClass/SplitClass/PlayerViewController.m:11:11: No visible @interface for 'PlayerViewController' declares the selector 'testMethod'

Edit1: End example solution
github.com/nullproduction/SplitClass

Answer 1

The first error is that the PlayerViewController is not defined at the time the category is declared. The second follows from the first - the category is not declared, which means there is no method.
If you really want to import just one header for all categories, then my solution is this:
File PlayerViewControllerMain.h : main declarations (without categories)
PlayerViewController + {Category1|Category2|...} .h files : category declarations, each imports PlayerViewControllerMain. h
File PlayerViewController.h : includes all of the above files for easy access to all categories at once

Answer 2

Files PlayerViewController+{Category1|Category2|...}.h: category declarations, each import PlayerViewControllerMain.h

And do we do categories for PlayerViewControllerMain?
It seems that I did everything as you said, it did not help.
The code for this test project is www.dropbox.com/s/x7wiwvababgcho2/SplitClass.zip

Answer 3

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