How to create UIButton and its #selector in a NSObject - objective-c

Question

I'm trying to generate a class that can create a UIButton and take care of what happens when you press the button in any view where the button is located. Here is what I'm doing:
Header File:
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#interface CreateButton : NSObject
- (UIButton *)createButton;
#end
Implementation:
#import "CreateButton.h"
#implementation CreateButton
- (UIButton *)createButton
{
// Instanciate the class
CreateButton *classInstance = [[CreateButton alloc] init];
UIButton *testButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0, 0.0, 50.0, 50.0)];
[testButton setBackgroundColor:[UIColor redColor]];
[testButton addTarget:classInstance action:#selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
return testButton;
}
- (void)buttonClicked:(UIButton *)sender
{
NSLog(#"Clicked");
}
#end
And finally, in the a view controller, I initialize the class and get the button:
CreateButton *create = [[CreateButton alloc] init];
UIButton *testButton = [create createButton];
[self.view addSubview:testButton];
Now everything is ok up to this point and I can see the button, however, nothing happens when I click it. Surprisingly, if I move the buttonClicked: method to my view controller it works just fine. I need to keep all the button wiring inside the NSObject. Any help would be greatly appreciated.

Answer 1

Ok, I solved the problem, interesting.
Implementation file will be modified as:
- (UIButton *)createButton
{
UIButton *testButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0, 0.0, 50.0, 50.0)];
[testButton setBackgroundColor:[UIColor redColor]];
[testButton addTarget:self action:#selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
return testButton;
}
Then, in the view controller, CreateButton class must be pre-defined in the header file #interface section. Then in the implementation:
create = [[CreateButton alloc] init];
and it works! That would be great if you kindly explains this to me.