ChainOfResponsibility.swift

typealias CGFloat = (Float, Float)
class UIResponder {
    func handleTap(event: TapEvent) {}
}

class TapEvent {
  let location: CGFloat
  
    init(location: CGFloat) {
        self.location = location
    }
}

class UIView: UIResponder {
  var successor: UIResponder? = nil
    
  override func handleTap(event: TapEvent) {
   guard canHandleTap() else {
     successor?.handleTap(event: event)
     return
   }
    print("Tap handled by view \(event.location)")
  }
  
  func canHandleTap() -> Bool { return false }
}

class UITableView: UIResponder {
  var successor: UIResponder?

   override func handleTap(event: TapEvent) {
    guard canHandleTap() else {
     successor?.handleTap(event: event)
     return
   }
    print("Tap handled by UITableView \(event.location)")
  }
  
  func canHandleTap() -> Bool { return false }
}

class UIButton: UIResponder {
  var successor: UIResponder?

    override func handleTap(event: TapEvent) {
   guard canHandleTap() else {
     successor?.handleTap(event: event)
     return
   }
        print("Tap handled by Button \(event.location)")
  }
  
  func canHandleTap() -> Bool { return true }
}

let button = UIButton()
button.successor = nil
let tableView = UITableView()
tableView.successor = button
let view = UIView()
view.successor = tableView


let tapEvent = TapEvent(location: (10.0,10.0))
view.handleTap(event: tapEvent)