Question

我想知道如何在tableview单元内的collection view中加载更多功能。由于未启用收藏夹视图滚动。

在收集视图单元格中放置最后索引检查代码会产生奇怪的行为，因为有时到达最后一个索引根本无法调用功能，有时它会在移至其他单元格时加载更多内容。我知道这是由于tableview单元而发生的。谁能帮我解决该问题。

这是我正在使用的代码：

//
//  JustForYouTableViewCell.swift
//  ShoppingPortal
//
//  Created by Faraz Haider on 10/07/2019.
//  Copyright © 2019 B2b. All rights reserved.
//

import UIKit
protocol JustForYouTableViewCellDelegate: class {
    func justForYouClickedWithItem(_ itemIndex:Int)
    func loadMoreDataForJustForYouWithPageNumber(pageNumber : Int, records: Int)
}


class JustForYouTableViewCell: BaseTableViewCell {

    @IBOutlet weak var justForYouCollectionView: UICollectionView!
    weak var delegate: JustForYouTableViewCellDelegate?
    var justForYouArray = [Product]()
    var cellHeight:CGFloat = 0
    var pageNumber = 1
    var currentRecordsCount = 0
    var totalNumberOfRecord = 0
    var isLoadMore = false
    var isReload = false

    @IBOutlet weak var collectionHeight: NSLayoutConstraint!
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }


    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

    override func updateCell(rowModel: BaseRowModel) {
        if !isReload{
           justForYouArray = rowModel.rowValue as! [Product]
            pageNumber = rowModel.tag
            totalNumberOfRecord = rowModel.rowId
        }

        currentRecordsCount = justForYouArray.count

        if(currentRecordsCount < totalNumberOfRecord){
            isLoadMore = true
        }else{
            isLoadMore = false
        }
        self.delegate = rowModel.delegate as? JustForYouTableViewCellDelegate
        justForYouCollectionView.dataSource = self
        justForYouCollectionView.delegate = self
        justForYouCollectionView.isScrollEnabled = false
        cellHeight = rowModel.rowHeight

        NotificationCenter.default.addObserver(self, selector: #selector(doThisWhenNotify(notification:)), name: NSNotification.Name(rawValue: "post"), object: nil)

        self.collectionHeight.constant = self.justForYouCollectionView.collectionViewLayout.collectionViewContentSize.height;
        justForYouCollectionView.reloadData()
    }

    override func systemLayoutSizeFitting(_ targetSize: CGSize, withHorizontalFittingPriority horizontalFittingPriority: UILayoutPriority, verticalFittingPriority: UILayoutPriority) -> CGSize {

        self.layoutIfNeeded()
        let contentSize = self.justForYouCollectionView.collectionViewLayout.collectionViewContentSize
        return CGSize(width: contentSize.width, height: contentSize.height + 20) // 20 is the margin of the collectinview with top and bottom
    }


    @objc func doThisWhenNotify(notification : NSNotification) {
        if let info = notification.userInfo as? NSDictionary{
            if let id = info["product"] as? [Product]{
                justForYouArray.append(contentsOf:id)
            }
            isReload = true
            let homeVC = self.viewController as? HomeVC
            homeVC?.dashboardTblView.reloadData()

        }
    }

    @IBAction func moreButtonClicked(_ sender: Any) {

        let viewController:MoreProductsVC = UIStoryboard(name: "HomeModule", bundle: nil).instantiateViewController(withIdentifier: "MoreProductsVC") as! MoreProductsVC
        viewController.selectedState = .SelectedStateJustForYou
        self.viewController?.navigationController?.pushViewController(viewController, animated: true)
    }
}
extension JustForYouTableViewCell: UICollectionViewDataSource,UICollectionViewDelegate {

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return justForYouArray.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell : JustForYouCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "JustForYouCollectionViewCell", for: indexPath) as! JustForYouCollectionViewCell


        let deals = justForYouArray[indexPath.row]
        cell.titleLabel.text = Utility.checkEmptyString(deals.name)

        if deals.productImage.count>0{
            if let imageUrl = deals.productImage[0].url{
                let url = URL(string: imageUrl)
                let image = UIImage(named: "placeholder")
                cell.dealsImageView.kf.setImage(with: url, placeholder: image)
            }
        }

        if deals.setPriceOption == 1{
            cell.priceLabel.text = String(format: "%@ %d - %d %@", Utility.checkEmptyString(deals.fobPriceName),deals.min,deals.max,Utility.checkEmptyString(deals.tradeUnitName))
        }else{
            if deals.productDifferencePriceQuantity.count>0{
                cell.priceLabel.text = String(format: "%@ %d - %d %@", "USD",deals.productDifferencePriceQuantity[0].mOQ,deals.productDifferencePriceQuantity[0].fOBPrice,Utility.checkEmptyString(deals.tradeUnitTypeName))
            }else{
                cell.priceLabel.text = ""
            }

        }

        // Check if the last row number is the same as the last current data element
        if indexPath.row == self.justForYouArray.count - 1 && self.isLoadMore {
            updateNextSet()
        }

        return cell
    }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        print(indexPath.row)
        let deals = justForYouArray[indexPath.row]
        let storyBoard: UIStoryboard = UIStoryboard(name: "HomeModule", bundle: nil)
        let newViewController = storyBoard.instantiateViewController(withIdentifier: "ProductDetailVC") as! ProductDetailVC
        if (deals.productId != nil){
            newViewController.selectedProductId = deals.productId
            self.viewController?.navigationController?.pushViewController(newViewController, animated: true)
        }

    }



    func updateNextSet(){
            pageNumber += 1
            self.delegate?.loadMoreDataForJustForYouWithPageNumber(pageNumber: pageNumber, records: currentRecordsCount)
            isLoadMore = false
    }
}


extension JustForYouTableViewCell: UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let spacing : CGFloat = (collectionViewLayout as? UICollectionViewFlowLayout)?.minimumInteritemSpacing ?? 0.0
        let widthPerItem = (collectionView.frame.height  - spacing * 2) / 3
        return CGSize(width: screenWidth/2, height: 200)
    }
}

Answer 1

好吧，我确实从其他来源得到了答案?对于正在寻找解决方案的人们，我所做的是我将滚动视图委托scrollview结束了拖动，并提出了一旦达到滚动视图的最大高度的条件-我的最后一个单元确实将更多负载加载到了它们上。谢谢大家

**

代码段

**

func scrollViewDidEndDragging（_ scrollView：UIScrollView，willDecelerate减速：Bool）{

// UITableView only moves in one direction, y axis
let currentOffset = scrollView.contentOffset.y
let maximumOffset = scrollView.contentSize.height - scrollView.frame.size.height

// Change 10.0 to adjust the distance from bottom
if maximumOffset - currentOffset <= 235 {
    if (self.isLoadMore){
        self.isFirstTime = false
        justForYouPageNumber += 1
        callServiceFoNewArrivals(withPageNumber: justForYouPageNumber, andRecords: 10)
    }


   }
}

在tableview单元格内为collectionview加载更多功能

1 个答案: