常連

### 前提・実現したいこと

[こちら](https://fussan-blog.com/swift3-simple-calendar/)と[こちら](https://qiita.com/sakuran/items/3c2c9f22cbcbf4aff731)を参考にUICollectionViewを使ってカレンダーを作成しました。

ボタンによる月の変更が実装できたので、今度はスワイプ操作での月の変更を行いたいのですが
調べても手立てがわからなかったので質問させて下さい。

具体的には、添付画像の青枠の部分をスワイプすることによって
UIScrollViewのような動きでカレンダーを先月・翌日に変更させたいです。

自分なりに調べたことを下記に記述します。
アプローチの仕方が全くわからなかったのでご教示頂けると幸いです。

### 該当のソースコード

```CalendarViewController
class CalendarViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout{
    
    @IBOutlet weak var navigationbar: UINavigationBar!
    @IBOutlet weak var calendarView: UICollectionView!
    
    let dateManager = DateManager()
    let weekArray = ["日","月","火","水","木","金","土"]
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        navigationbar.barTintColor = UIColor.themeColor()
        navigationbar.isTranslucent = false
        navigationbar.titleTextAttributes = [.foregroundColor: UIColor.white]
        calendarView.delegate = self
        calendarView.dataSource = self
        
        //ナビゲーションタイトルの設定
        let selectedDate = self.dateManager.selectedDate
        self.navigationItem.title = self.dateManager.getFormattedDay(date: selectedDate)
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
    //カレンダーを前の月に戻す
    @IBAction func movePrevMonth(_ sender: UIButton) {
        let currentDate = dateManager.selectedDate
        let prevDate = dateManager.getPrevDate(currentDate: currentDate)
        calendarView.reloadData()
        self.navigationItem.title = dateManager.getFormattedDay(date: prevDate)
    }
    
    //カレンダーを次の月に進める
    @IBAction func moveNextMonth(_ sender: UIButton) {
        let currentDate = dateManager.selectedDate
        let nextDate = dateManager.getNextDate(currentDate: currentDate)
        calendarView.reloadData()
        self.navigationItem.title = dateManager.getFormattedDay(date: nextDate)
    }
    
    //Sectionの数
    internal func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 2
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
        switch(section){
        case 0:
            return CGSize(width: self.view.frame.width, height: 0)
        default:
            return CGSize(width: 0, height: 0)
        }
    }
    
    //Cellの総数を返す
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        // Section毎にCellの総数を変える.
        switch(section){
        case 0:
            return 7
        case 1:
            return dateManager.getDayCellNumber()
        default:
            print("error")
            return 0
        }
    }
    
    //Cellに値を設定する
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        // Section毎にCellのプロパティを変える.
        switch(indexPath.section){
        case 0:
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CalendarCellOne", for: indexPath as IndexPath) as! CalendarCellOne
//            cell.backgroundColor = UIColor.themeColor()
//            cell.dateLabel.font = UIFont.boldSystemFont(ofSize: 14)
//            cell.dateLabel.textColor = UIColor.white
            cell.dateLabel.text = weekArray[indexPath.row]
            cell.trashIconOne.image = nil
            return cell
        case 1:
            let ordinalityOfFirstDay = Calendar.current.ordinality(of: .day, in: .weekOfMonth, for: dateManager.getFirstDateOfMonth())
            let dateRange = NSCalendar.current.range(of: .day, in: .month, for: dateManager.getFirstDateOfMonth())
            var dateText = self.dateManager.conversionDateFormat(indexPath: indexPath)
            
            if (ordinalityOfFirstDay! - 1) > indexPath.row || ((ordinalityOfFirstDay! - 1) + dateRange!.count) - 1 < indexPath.row{
                dateText = ""
            }

            let kinds = dateManager.getTrashKind(indexPath: indexPath)
            if let kinds = kinds{
                switch(kinds.count){
                case 0:
                    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CalendarCellOne", for: indexPath as IndexPath) as! CalendarCellOne
                    cell.layer.borderColor = UIColor.lightGray.cgColor
                    cell.layer.borderWidth = CGFloat(0.5)
                    cell.dateLabel.text = dateText
                    
                    return cell
                case 1:
                    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CalendarCellOne", for: indexPath as IndexPath) as! CalendarCellOne
                    cell.layer.borderColor = UIColor.lightGray.cgColor
                    cell.layer.borderWidth = CGFloat(0.5)
                    cell.dateLabel.text = dateText

                    if !(cell.dateLabel.text?.isEmpty)!{
                        //cell.trashIconOne.image = TrashInfoManager.getTrashIcon(kind: kinds[0])
                    }
                    return cell
                case 2:
                    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CalendarCellTwo", for: indexPath as IndexPath) as! CalendarCellTwo
                    cell.layer.borderColor = UIColor.lightGray.cgColor
                    cell.layer.borderWidth = CGFloat(0.5)
                    cell.dateLabel.text = dateText
                    
                    if !(cell.dateLabel.text?.isEmpty)!{
                        //cell.trashIconOne.image = TrashInfoManager.getTrashIcon(kind: kinds[0])
                        //cell.trashIconTwo.image = TrashInfoManager.getTrashIcon(kind: kinds[1])
                    }

                    return cell
    //                    case 3:
    //                    case 4:
                default:
                    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CalendarCellOne", for: indexPath as IndexPath)
                    cell.backgroundColor = UIColor.white
                    return cell
                }
            }
            
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CalendarCellOne", for: indexPath as IndexPath)
            cell.backgroundColor = UIColor.white
            return cell
        default:
            print("section error")
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CalendarCellOne", for: indexPath as IndexPath)
            cell.backgroundColor = UIColor.white
            return cell
        }
    }
    
    //セルのサイズを設定
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let width: CGFloat = collectionView.frame.size.width / CGFloat(7.0)
        var height:CGFloat = 0
        
        if indexPath.section == 0{
            height = width * CGFloat(0.5)
        }else if indexPath.section == 1{
            height = width * CGFloat(1.5)
        }
        
        return CGSize(width:width, height:height)
    }
    
    //セルの垂直方向のマージンを設定
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        return 0
    }
    
    //セルの水平方向のマージンを設定
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
        return 0
    }
}
```

### 調べたこと

[【iOS】【swift】カレンダーを作ってみる](https://qiita.com/kitanoow/items/65b1418527eabf31e45b)
こちらが参考になりそうかと思いましたが、カレンダーの実装方法が自分のものと違うため
どのようにUIScrollViewと関連付ければいいのかわかりませんでした。

### 画像
![イメージ説明](d2da981983f683eb0314e55f9132b62b.png)

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