touchesEnded.swift

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesEnded(touches, with: event)
        
        if self.twoFingersMoveUp() {
            self.fingersDirection = TwoFingersMove.moveUp
            state = .ended
            return
        }
        
        if self.twoFingersMoveDown() {
            self.fingersDirection = TwoFingersMove.moveDown
            state = .ended
            return
        }
        
        state = .failed
    }