问使UICollectionViewCell的高度与AutoLayout匹配其内容(所有子视图的高度之和)

EN

public class MyCustomItemCell: UICollectionViewCell {

    // other child views references ...

    @IBOutlet weak var wrapperView: UIView! // view which contains your other views

    //forces the system to do one layout pass
    var isHeightCalculated: Bool = false

    override public func preferredLayoutAttributesFitting(_ layoutAttributes: UICollectionViewLayoutAttributes) -> UICollectionViewLayoutAttributes {
        //Exhibit A - We need to cache our calculation to prevent a crash.
        if !isHeightCalculated {
            setNeedsLayout()
            layoutIfNeeded()
            var newFrame = layoutAttributes.frame
            newFrame.size.height = wrapperView.frame.height // use height of our UIView
            layoutAttributes.frame = newFrame
            isHeightCalculated = true
        }
        return layoutAttributes
    }
}

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize
    {
        //return something like the size. I write you an example how to use it.
        // You can easily change the value according to your stuff contents height.

        return CGSize(width: collectionView.frame.size.width/3, height: 100)
    }