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func scrollViewDidScroll(_ scrollView: UIScrollView) {
        if self.tableView.indexPathsForVisibleRows?.first?.section == ClinicInfomationSection.services.rawValue {
            
            if !extensionView.isExpanded && !extensionView.isMoving {
                extensionView.expand()
            }
            
            let firstVisibleCell = self.tableView.visibleCells.first
            if let cell = firstVisibleCell as? ClinicServiceCell {
                extensionView.setLabelText(cell.serviceTitle.text!)
            }
        } else {
            
            if extensionView.isExpanded && !extensionView.isMoving {
                extensionView.contract()
            }
        }
    }

class ExtensionView: UIView {
    @IBOutlet weak var label: UILabel?
    var isExpanded: Bool = false
    var isMoving: Bool = false
    
    func expand() {
        isMoving = true
        
        self.isHidden = false
        self.alpha = 0
        self.y -= self.height
        
        UIView.animate(withDuration: 0.2,
            animations: { () -> Void in
            self.y += self.height
            self.alpha = 1
        },
            completion: { (Bool) -> Void in
                self.isExpanded = true
                self.isMoving = false
        })
    }
    
    func contract() {
        isMoving = true
        UIView.animate(withDuration: 0.2,
            animations: { () -> Void in
                self.y -= self.height
                self.alpha = 0
        },
            completion: { (Bool) -> Void in
                self.isHidden = true
                self.y += self.height
                self.isExpanded = false
                self.isMoving = false
        })
    }
    
    func setLabelText(_ text: String, fromTop: Bool = true) {
        CATransaction.begin()
        let animation = CATransition()
        animation.duration = 0.2
        animation.type = kCATransitionPush
        animation.subtype = fromTop ? kCATransitionFromTop : kCATransitionFromBottom
        animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
        
        isMoving = true
        CATransaction.setCompletionBlock {
            self.isMoving = false
        }
        
        self.label?.layer.add(animation, forKey: "changeLabelText")
        self.label?.text = text
        
        CATransaction.commit()
    }
    
}