如何根據內容設置collectionview單元格寬度？

Question

我有一個水平滾動的collectionview.cell包含一個標簽。我想根據標簽的內容調整單元格的寬度。如何實現？請幫助我

Answer 1

而不是調用sizeforitem

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

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

您可以設置布局屬性以根據標簽內容自動調整大小

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

Answer 2

使用此功能可計算標簽寬度

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

使用UICollectionViewDelegateFlowLayout設置collectionViewCell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)
}