collectionview.swift

import UIKit
import RxSwift
import RxCocoa
import RxDataSources

private let reuseIdentifier = "OrderProductItemCell"

class OrderProductItemView: UICollectionViewController {
    var viewModel: 
    OrderProductsViewModel!
    var delegate: ProductPicturesDelegate?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        collectionView?.backgroundColor = .white
        collectionView?.register(OrderProductItemCell.self, forCellWithReuseIdentifier: reuseIdentifier)
        
        if let layout = collectionViewLayout as? UICollectionViewFlowLayout {
            layout.scrollDirection = .horizontal
            layout.minimumLineSpacing = 8
            layout.itemSize = CGSize(width: 100, height: 100)
            layout.minimumInteritemSpacing = 5
        }
        
        collectionView?.showsHorizontalScrollIndicator = false
        

        collectionView.dataSource = nil
        collectionView.delegate = nil
    }
    
    func bindViewModel() {
        
        viewModel.transform().asDriver(onErrorJustReturn: [])
            .drive(self.collectionView.rx.items(cellIdentifier: reuseIdentifier, cellType: OrderProductItemCell.self)) { collectionView, viewModel, cell in
                cell.bind(to: viewModel)
            }.disposed(by: rx.disposeBag)
        
        collectionView.rx.modelSelected(ProductPicturesItemViewModel.self)
            .bind { vm in
                self.delegate?.didTapOnItem(p: vm.proudctImage)
            }.disposed(by: rx.disposeBag)
    }
}