我在TableView中有一个动态collectionView,并且在添加invalidateLayout时出现错误(下图)
但是,如果我删除invalidateLayout,则前四个单元格将被隐藏并且布局无法正确显示,因此video

,请帮助我搜索整个堆栈,但没有帮助,谢谢

如果您需要测试project

MainViewController

class ViewController: UIViewController, UIScrollViewDelegate {


  override func viewDidLoad() {
        super.viewDidLoad()
        setting()
    }

  func setting(){

   getData()

   tableView.dataSource = self
   tableView.delegate = self

   tableView.estimatedRowHeight = UITableView.automaticDimension
   tableView.rowHeight = UITableView.automaticDimension

  }

         //load data
   func pagination(_ completion: (()->())?){

      SmartNetworkSevrice.getGoods(with: url) { [unowned self] (data) in
         guard data.modals.count > 0 else {
             self.tableView.tableFooterView = nil
             return
         }

         self.goods.append(contentsOf: data.modals)
         self.offSet += data.modals.count
         DispatchQueue.main.async {
             let indexPath = IndexPath(row: 0, section: 0)
             self.tableView.tableFooterView = nil
             if self.goods.count == data.modals.count || self.isRefresh {
                self.tableView.reloadRows(at: [indexPath], with: .none)
             } else {
                if let cell = self.tableView.cellForRow(at: indexPath) as? TVCellGoods {
                    UIView.performWithoutAnimation {
                        self.tableView.beginUpdates()
                        cell.insertGoods(data.modals)
                        cell.layoutIfNeeded()
                        cell.collectionViewHeight.constant = cell.collectionView.collectionViewLayout.collectionViewContentSize.height
                        self.tableView.endUpdates()
                     }

                }
             }
            completion?()
         }
     }

     // define bottom of tableView
    func scrollViewDidScroll(_ scrollView: UIScrollView) {

        guard scrollView == self.tableView else {  return }
        if (!isMoreDataLoading) {

            // Вычислить позицию длины экрана до нижней части результатов
            let scrollViewContentHeight = scrollView.contentSize.height
            let scrollOffsetThreshold = scrollViewContentHeight - scrollView.bounds.size.height
            if(scrollView.contentOffset.y > scrollOffsetThreshold && scrollView.isDragging) {
                isMoreDataLoading = true
                self.tableView.isScrollEnabled = false;
                self.tableView.isScrollEnabled = true;
                pagination(nil)
            }
        }

       }

    }

extension ViewController: UITableViewDataSource {


    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 1
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            guard let cell = tableView.dequeueReusableCell(withIdentifier: "goods", for: indexPath) as? TVCellGoods else { return UITableViewCell() }
              guard bestGoods.count != 0, goods.count != 0 else { return UITableViewCell() }
            cell.delegate = self
            cell.configure(bestGoods, goods, categories)
            // автообновление высоты
            self.tableView.beginUpdates()
            cell.collectionViewHeight.constant = cell.collectionView.collectionViewLayout.collectionViewContentSize.height
            self.tableView.endUpdates()
            return cell
    }

}

extension ViewController: UITableViewDelegate, CallDelegate {

    func callMethod() {}

    func callMethod(push vc:UIViewController) {
        self.navigationController?.pushViewController(vc, animated: true)
    }

    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
            return UITableView.automaticDimension
    }

    func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
            return UITableView.automaticDimension
    }

}

具有collectionView的TableViewCell
class TVCellGoods: UITableViewCell {

    @IBOutlet weak var collectionView:UICollectionView!
    @IBOutlet weak var collectionViewHeight:NSLayoutConstraint!

    weak var delegate:CallDelegate?
    var bestGoods = [Goods]() // лучшие товары
    var goods = [Goods]() // все товары
    var categories = [Menu]()

    override func layoutSubviews() {
       super.layoutSubviews()
       self.collectionView.collectionViewLayout.invalidateLayout()
    }

    override func awakeFromNib() {
        super.awakeFromNib()

        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.tag = 2
        collectionView.isScrollEnabled = false

    }

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

        // Configure the view for the selected state
    }

    func configure(_ best:[Goods],_ goods:[Goods], _ category:[Menu]) {

        self.bestGoods = best
        self.goods = goods
        self.categories = category
        self.collectionView.reloadData()

    }

    func insertGoods(_ data:[Goods]) {

        self.goods.append(contentsOf: data)
        let count = self.bestGoods.count + self.categories.count  + self.goods.count
        let indexPaths = ((count - data.count) ..< count)
            .map { IndexPath(row: $0, section: 0) }
        self.collectionView.performBatchUpdates({
            self.collectionView.insertItems(at: indexPaths)
        }, completion: nil)

    }

}

和CollectionViewCell
class CVCellGoods: UICollectionViewCell {

    @IBOutlet weak var bgView: UIView!
    @IBOutlet weak var imageView: UIImageView!
    @IBOutlet weak var title: UILabel!
    @IBOutlet weak var price: UILabel!
    @IBOutlet weak var delivery: UIImageView!
    @IBOutlet weak var premium: UIImageView!

    override func prepareForReuse() {
        super.prepareForReuse()
        delivery.image = nil
        premium.image = nil
        title.text = nil
        price.text = nil
        imageView.image = nil
        imageView.sd_cancelCurrentImageLoad()
    }

    override func awakeFromNib() {
        super.awakeFromNib()

        imageView.backgroundColor = UIColor(red: 215/255, green: 215/255, blue: 215/255, alpha: 1)

        self.contentView.layer.cornerRadius = 5
        self.contentView.layer.masksToBounds = true

        self.layer.shadowColor = UIColor.black.cgColor
        self.layer.shadowOffset = CGSize(width: 0, height: 0.5)
        self.layer.shadowRadius = 1
        self.layer.shadowOpacity = 0.3
        self.layer.masksToBounds = false
        self.layer.shouldRasterize = true
        self.layer.rasterizationScale = UIScreen.main.scale

    }

}

编辑

如果我用
    self.collectionView.performBatchUpdates({
            self.collectionView.insertItems(at: indexPaths)
        }, completion: { _ in
            self.collectionView.reloadItems(at: indexPaths)
        })

使用invalidateLayout,然后在屏幕底部出现一个空白区域
ios - collectionView.collectionViewLayout.invalidateLayout()-LMLPHP
但是,如果我删除invalidateLayout,我会得到错误的布局ios - collectionView.collectionViewLayout.invalidateLayout()-LMLPHP

(如果您不喜欢我的项目),然后放弃您的改进项目

SECOND编辑

我注意到iPhone 11 Pro上有凹痕,iPhone 11 Pro Max上一切正常

ios - collectionView.collectionViewLayout.invalidateLayout()-LMLPHP

ios - collectionView.collectionViewLayout.invalidateLayout()-LMLPHP

最佳答案

更新:我验证了它可以在iPhone SE,11和11 Max的模拟器上正常工作,并且在集合视图的末尾没有死角。

我的模拟器设置为暗模式,以显示集合视图的底部足以容纳加载图标。

ios - collectionView.collectionViewLayout.invalidateLayout()-LMLPHP

我必须对此进行一些更改以使其大小正确。首先,我更改了insertGoods类中的TVCellGoods函数,使其在插入后仅重新加载新添加的项目,并且列表顶部不再缺少缺少的项目:

    self.collectionView.performBatchUpdates({
        self.collectionView.insertItems(at: indexPaths)
    }, completion: { _ in
        self.collectionView.reloadItems(at: indexPaths)
    })

一个大问题是设置tableView单元格的估计行高。我删除了estimatedHeightForRowAt覆盖,并用以下代码替换了自己的heightForRowAt:
   func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

        if indexPath.row == 0 {
            return (tableView.frame.width / 2.5) + 20
        } else if indexPath.row == 1 {
            return 70
        } else {
            guard let cell = tableView.cellForRow(at: indexPath) as? TVCellGoods else { return UITableView.automaticDimension }
//            print(cell.collectionViewHeight.constant)
            return cell.collectionViewHeight.constant
        }
    }

我还必须在layoutIfNeeded扩展名中将ViewController UITableViewDataSource添加到您的cellForRow中:
self.tableView.beginUpdates()
cell.collectionViewHeight.constant = cell.collectionView.collectionViewLayout.collectionViewContentSize.height
self.tableView.endUpdates()
cell.collectionView.layoutIfNeeded()
self.tableView.layoutIfNeeded()

最后,在使layoutSubviews中的布局无效之后,我不得不更新您的TVCellGoods以分配正确的高度:
override func layoutSubviews() {
    super.layoutSubviews()

    self.collectionView.collectionViewLayout.invalidateLayout()

    self.collectionViewHeight.constant = self.collectionView.collectionViewLayout.collectionViewContentSize.height
}

这是更新的源代码:https://drive.google.com/open?id=1ldr4Ml2prZKmr1C4i1s5Sg7LvvxL7-jO

关于ios - collectionView.collectionViewLayout.invalidateLayout(),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/61481436/

10-09 17:47