[swift] collectionViewController (xcode9 : swift4) テンプレート

collectionViewController (xcode9 : swift4) テンプレートを下記に記しておく

import UIKit

class TestCollectionViewController: UICollectionViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    //データの個数を返すメソッド
    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 7
    }
    
    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "TestCell", for: indexPath as IndexPath)
        let imageView = cell.contentView.viewWithTag(1) as! UIImageView
        imageView.image = UIImage(named: "image" + String(indexPath.row) + ".png")
        
        return cell
    }
    
    override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        //セグエを実行する。
        performSegue(withIdentifier: "TestSegue", sender: nil)
        print("selected")
    }
    
    
    
    //画面遷移実行前の呼び出しメソッド
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        //選択中のセルの画像を取得する。
        let index = collectionView?.indexPathsForSelectedItems
        let cell = collectionView?.cellForItem(at: index![0])
        let imageView = cell!.viewWithTag(1) as! UIImageView
        
        //その他の処理
    }
    
}