对丹尼尔·加拉斯科的回答做了一些关键的修改，解决了我所有的问题。不幸的是，我还没有足够的声誉来直接评论。

在第一步，当使用自动布局时，简单地添加一个单亲UIView到单元格。单元格内的所有东西都必须是父视图的子视图。这解决了我所有的问题。虽然Xcode会自动为UITableViewCells添加这个，但它不会(但应该)为UICollectionViewCells添加这个。根据文件:

要配置单元格的外观，请在contentView属性的视图中添加将数据项的内容作为子视图显示所需的视图。不要直接向单元格本身添加子视图。

然后完全跳过步骤3。这是不需要的。

更新更多信息:

If you use flowLayout.estimatedItemSize, suggest use iOS8.3 later version. Before iOS8.3, it will crash [super layoutAttributesForElementsInRect:rect];. The error message is *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil' Second, in iOS8.x version, flowLayout.estimatedItemSize will cause different section inset setting did not work. i.e. function: (UIEdgeInsets)collectionView:layout:insetForSectionAtIndex:.

在iOS10中有一个名为UICollectionViewFlowLayout的新常量。automaticSize(以前的UICollectionViewFlowLayoutAutomaticSize)，所以改为:

self.flowLayout.estimatedItemSize = CGSize(width: 100, height: 100)

你可以用这个:

self.flowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize

它具有更好的性能，特别是当集合视图中的单元格具有恒定宽度时。

访问流布局:

override func viewDidLoad() {
   super.viewDidLoad()

   if let flowLayout = collectionView?.collectionViewLayout as? UICollectionViewFlowLayout {
      flowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
   }
}

Swift 5更新:

override func viewDidLoad() {
   super.viewDidLoad()

   if let flowLayout = collectionView?.collectionViewLayout as? UICollectionViewFlowLayout {
      flowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
    }
}

我尝试使用estimatedItemSize，但在插入和删除单元格时，如果estimatedItemSize不完全等于单元格的高度，则有一堆错误。我停止设置estimatedItemSize，并通过使用原型单元格实现动态单元格。这是如何做到的:

创建这个协议:

protocol SizeableCollectionViewCell {
    func fittedSize(forConstrainedSize size: CGSize)->CGSize
}

在你的自定义UICollectionViewCell中实现这个协议:

class YourCustomCollectionViewCell: UICollectionViewCell, SizeableCollectionViewCell {

    @IBOutlet private var mTitle: UILabel!
    @IBOutlet private var mDescription: UILabel!
    @IBOutlet private var mContentView: UIView!
    @IBOutlet private var mTitleTopConstraint: NSLayoutConstraint!
    @IBOutlet private var mDesciptionBottomConstraint: NSLayoutConstraint!

    func fittedSize(forConstrainedSize size: CGSize)->CGSize {

        let fittedSize: CGSize!

        //if height is greatest value, then it's dynamic, so it must be calculated
        if size.height == CGFLoat.greatestFiniteMagnitude {

            var height: CGFloat = 0

            /*now here's where you want to add all the heights up of your views.
              apple provides a method called sizeThatFits(size:), but it's not 
              implemented by default; except for some concrete subclasses such 
              as UILabel, UIButton, etc. search to see if the classes you use implement 
              it. here's how it would be used:
            */
            height += mTitle.sizeThatFits(size).height
            height += mDescription.sizeThatFits(size).height
            height += mCustomView.sizeThatFits(size).height    //you'll have to implement this in your custom view

            //anything that takes up height in the cell has to be included, including top/bottom margin constraints
            height += mTitleTopConstraint.constant
            height += mDescriptionBottomConstraint.constant

            fittedSize = CGSize(width: size.width, height: height)
        }
        //else width is greatest value, if not, you did something wrong
        else {
            //do the same thing that's done for height but with width, remember to include leading/trailing margins in calculations
        }

        return fittedSize
    }
}

现在让你的控制器符合UICollectionViewDelegateFlowLayout，在它里面，有这个字段:

class YourViewController: UIViewController, UICollectionViewDelegateFlowLayout {
    private var mCustomCellPrototype = UINib(nibName: <name of the nib file for your custom collectionviewcell>, bundle: nil).instantiate(withOwner: nil, options: nil).first as! SizeableCollectionViewCell
}

它将被用作一个原型单元格来绑定数据，然后确定该数据如何影响您想要动态的维度

最后，必须实现uicollectionviewdelegatflowlayout的collectionView(:layout:sizeForItemAt:):

class YourViewController: UIViewController, UICollectionViewDelegateFlowLayout, UICollectionViewDataSource {

    private var mDataSource: [CustomModel]

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath)->CGSize {

        //bind the prototype cell with the data that corresponds to this index path
        mCustomCellPrototype.bind(model: mDataSource[indexPath.row])    //this is the same method you would use to reconfigure the cells that you dequeue in collectionView(:cellForItemAt:). i'm calling it bind

        //define the dimension you want constrained
        let width = UIScreen.main.bounds.size.width - 20    //the width you want your cells to be
        let height = CGFloat.greatestFiniteMagnitude    //height has the greatest finite magnitude, so in this code, that means it will be dynamic
        let constrainedSize = CGSize(width: width, height: height)

        //determine the size the cell will be given this data and return it
        return mCustomCellPrototype.fittedSize(forConstrainedSize: constrainedSize)
    }
}

就是这样。在collectionView(:layout:sizeForItemAt:)中返回单元格的大小，以这种方式防止我不得不使用estimatedItemSize，并且插入和删除单元格工作得很好。

如果你实现uicollectionviewdelegatflowlayout方法:

- (CGSize)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath*)indexPath

当你调用collectionview performBatchUpdates:completion:时，size height将使用sizeForItemAtIndexPath代替 preferredLayoutAttributesFittingAttributes。

performBatchUpdates:completion的呈现过程将通过preferredLayoutAttributesFittingAttributes方法，但它会忽略您的更改。

内容查看主播奥秘:

在一个奇怪的例子中

    contentView.translatesAutoresizingMaskIntoConstraints = false

不会起作用。在contentView中添加了四个显式的锚，它工作了。

class AnnoyingCell: UICollectionViewCell {
    
    @IBOutlet var word: UILabel!
    
    override init(frame: CGRect) {
        super.init(frame: frame); common() }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder); common() }
    
    private func common() {
        contentView.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activate([
            contentView.leftAnchor.constraint(equalTo: leftAnchor),
            contentView.rightAnchor.constraint(equalTo: rightAnchor),
            contentView.topAnchor.constraint(equalTo: topAnchor),
            contentView.bottomAnchor.constraint(equalTo: bottomAnchor)
        ])
    }
}

像往常一样

    estimatedItemSize = UICollectionViewFlowLayout.automaticSize

在你的布局:UICollectionViewFlowLayout

谁知道呢?也许能帮到别人。

信贷

https://www.vadimbulavin.com/collection-view-cells-self-sizing/

无意中发现了这个技巧——在其他1000篇文章中从未见过。