Reusable *button* in Xcode - swift3

Question

I've created an actionSheet with 3 options that push to other view controllers and call a number. This option is on a button on a navigation bar on each screen of my app. I'm trying to find a way to reuse the code without literally re-typing it for every screen. I understand there is a way to do this through subclassing a UIButton but I've searched for days and can't find a definitive answer on how to actually code the subclass. My code right now is the following:
class moreButton: UIButton {
#IBAction func displayActionSheet(_ sender: Any) {
let alertController = UIAlertController(title: nil, message: "Get Your Roast On", preferredStyle: .actionSheet)
let followAction = UIAlertAction(title: "Follow Us", style: .default, handler: {(action: UIAlertAction!)->Void in self.performSegue(withIdentifier: "moveSegue", sender: self)
})
let shopAction = UIAlertAction(title: "Visit Shop", style: .default, handler: {(action: UIAlertAction!)->Void in self.performSegue(withIdentifier: "shopSegue", sender: self)
})
let callAction = UIAlertAction(title: "Call Us Now", style: .default) { _ in
let url:URL = URL(string: "tel://number")!
UIApplication.shared.open(url, options: [:], completionHandler: nil)
}
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
alertController.addAction(followAction)
alertController.addAction(shopAction)
alertController.addAction(callAction)
alertController.addAction(cancel)
self.present(alertController, animated: true, completion: nil)
}
}
I'm getting the error:
value of type 'moreButton' has no member 'performSegue'
in both the followAction and shopAction lines and "value of type 'moreButton' has no member 'present'" on the last line. This code was working when I had created an IBAction directly from the button but now it seems to have errors that I'm not sure how to correct.

Answer 1

You're getting those errors because performSegue and present are UIViewController methods.
Instead of subclassing UIButton, I'd create a new helper class, with a class method to build the UIAlertController for you. The method would accept a UIViewController as its parameter, so that it can build the UIAlertActions correctly.
You'd call this new method from displayActionSheet like:
let alertController = ActionSheetBuilder.build(viewController: self)
present(alert, animated: true, completion: nil)
Adapting your creation code into the new class would come out something like:
final class ActionSheetBuilder {
class func build(viewController: UIViewController) -> UIAlertController {
let alertController = UIAlertController(title: nil, message: "Get Your Roast On", preferredStyle: .actionSheet)
let followAction = UIAlertAction(title: "Follow Us", style: .default, handler: {(action: UIAlertAction!)->Void in viewController.performSegue(withIdentifier: "moveSegue", sender: viewController) })
let shopAction = UIAlertAction(title: "Visit Shop", style: .default, handler: {(action: UIAlertAction!)->Void in viewController.performSegue(withIdentifier: "shopSegue", sender: viewController) })
let callAction = UIAlertAction(title: "Call Us Now", style: .default) { _ in
let url:URL = URL(string: "tel://2845471035")!
UIApplication.shared.open(url, options: [:], completionHandler: nil)
}
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
alertController.addAction(followAction)
alertController.addAction(shopAction)
alertController.addAction(callAction)
alertController.addAction(cancel)
return alertController
}
}