Call method from another class in a UIButton - ios

Question

I have a custom UITableViewCell with a class linked to it called customCell.m. (I didn't use xib.) In the cell there is a button. Is there a way to create the buttons action on the mainVC.m file, as apposed to customCell.m?
Update
Here is the code I tried implementing. What I did is, I called a method from mainVC.m.
CustomCell.m
- (IBAction)myButton:(id)sender
{
CategorieViewController *mainVC = [[CategorieViewController alloc] init];
[mainVC myMethod];
}
MainVC.m
- (void)myMethod:(id)sender
{
UITableViewCell *clickedCell = (UITableViewCell *)[[[sender superview] superview] superview];
NSIndexPath *clickedButtonPath = [self.myTableView indexPathForCell:clickedCell];
NSLog(#"%#", clickedButtonPath);
}
CategorieViewController myMethod]: unrecognized selector sent to instance 0x7fd2dbd52a00
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CategorieViewController myMethod]: unrecognized selector sent to instance 0x7fd2dbd52a00'

Answer 1

You're calling myMethod, but the method is actually myMethod: and takes the sender as a parameter. Try changing:
[mainVC myMethod];
to:
[mainVC myMethod:sender];
Also, any sender you currently pass to myMethod: as a parameter, won't belong to mainVC's tableview yet because you're creating a brand new CategorieViewController instance to perform the method call and its table has never been loaded.
Assuming MainVC is the visible view controller, you can change:
CategorieViewController *mainVC = [[CategorieViewController alloc] init];
to:
UINavigationController *nav = (UINavigationController*)self.window.rootViewController;
CategorieViewController *mainVC = (CategorieViewController*)nav.visibleViewController;
to get the current the current MainVC instance with the loaded tableview.