How to implement UICollectionView in Swift with code only

class SampleCollectionView: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
    lazy var collectionView : UICollectionView = {
        let collectionView = UICollectionView(

            frame: CGRect(x: 0, y: statusBarHeight, width: self.view.frame.width, height: self.view.frame.size.height - statusBarHeight),
            collectionViewLayout: UICollectionViewFlowLayout())
            collectionView.delegate = self
            collectionView.dataSource = self
            collectionView.register(CollectionViewCell.self, forCellWithReuseIdentifier: "cellId")

        return collectionView
    }()

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        //Number of items in the cell
    }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        //Item size
    }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        //Top, bottom, left, and right margins of the entire item display area
    }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        //Minimum top and bottom margins for items
    }
    //Item display content (requires UICollectionViewDataSource)
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as! CollectionViewCell
        //What is displayed in the cell
        return cell
    }
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        //Action when a cell is clicked
    }
}

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