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// UICollecionViewController
class UICollectionViewController : UIViewController

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// collectionView
class UICollectionView : UIScrollView

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// MARK: flowLayout
let flowLayout = UICollectionViewFlowLayout()
flowLayout.sectionHeadersPinToVisibleBounds = true

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extension ViewController: UICollectionViewDataSource {
    // MARK: cell count
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return palette.count
    }
    
    // MARK: cell
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        guard let cell: CustomCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "\(CustomCollectionViewCell.self)", for: indexPath) as? CustomCollectionViewCell else {
            return UICollectionViewCell()

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extension ViewController: UICollectionViewDelegate {
    
    // MARK: selected
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        print("\(indexPath.item)번 Cell 클릭")
    }
}

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extension ViewController: UICollectionViewDelegateFlowLayout {
    // MARK: cellSize
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let collectionViewWidth = collectionView.bounds.width
        let cellItemForRow: CGFloat = 3
        let minimumSpacing: CGFloat = 2
        
        let width = (collectionViewWidth - (cellItemForRow - 1) * minimumSpacing) / cellItemForRow
        
        return CGSize(width: width, height: width)

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import UIKit

class CustomCollectionViewCell: UICollectionViewCell {
    weak var imageView: UIImageView?
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        let imageView = UIImageView()
        self.imageView = imageView

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import UIKit

class ViewController: UIViewController {
    
    // MARK: - Property
    let palette: [UIColor] = [.red, .orange, .yellow, .green, .blue]

    // MARK: - View
    private var collectionView: UICollectionView?
    

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let nextviewController = SecondViewController()
nextviewController.modalPresentationStyle = .fullScreen
nextviewController.modalTransitionStyle = .partialCurl
        
present(nextviewController, animated: true)

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Observable.just(data) // Observable을 만들어 주고
.bind(to: tableView.rx.items()) // tableView.rx.items()를 바인딩 해주고
.disposed(by: disposeBag) // disposeBag에 넣어주면 됩니다.