如何根据内容设置collectionview单元格宽度？

Question

我有一个水平滚动集合视图。单元格包含一个标签。我想根据标签的内容调整单元格宽度。如何实现？请帮我这个

Answer 1

而不是调用sizeforitem

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

 return CGSize(width: 100, height : 100)
}

您可以根据标签内容将布局属性设置为自动调整大小

let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
layout.minimumLineSpacing = 0
layout.minimumInteritemSpacing = 0
layout.estimatedItemSize = CGSize(width: 100, height: 30)

Answer 2

使用此func计算标签宽度

func widthOfString(usingFont font: UIFont) -> CGFloat {
     let fontAttributes = [NSFontAttributeName: font]
     let size = self.size(attributes: fontAttributes)
     return size.width
}

使用UICollectionViewDelegateFlowLayout设置collectionViewCell的大小

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = //calculated width of label from func
   return CGSize(width: width, height:requiredHeight)
}