如何包装长文本？

Question

在我的应用程序中，用户可以在帖子中发表评论。一切正常，但是在创建长文本时线条不会换行，因此我得到了此

[numberOfLines设置为= 0

这里是commentCell中设置约束的代码

   let commentLabel: ActiveLabel = {
            let label = ActiveLabel()
            label.font = UIFont.systemFont(ofSize: 13)
            label.numberOfLines = 0

            return label
            }()

  override init(frame: CGRect) {
            super.init(frame: frame)



            addSubview(profileImageView)
            profileImageView.anchor(top: topAnchor, left: leftAnchor, bottom: nil, right: nil, paddingTop: 8, paddingLeft: 8, paddingBottom: 0, paddingRight: 0, width: 40, height: 40)
            profileImageView.layer.cornerRadius = 40 / 2


            addSubview(optionsButton)
            optionsButton.anchor(top: topAnchor, left: nil, bottom: nil, right: rightAnchor, paddingTop: 12, paddingLeft: 0, paddingBottom: 0, paddingRight: 8, width: 20, height: 20)

            addSubview(commentLabel)
            commentLabel.anchor(top: topAnchor, left: profileImageView.rightAnchor, bottom: bottomAnchor, right: optionsButton.leftAnchor, paddingTop: 15, paddingLeft: 5, paddingBottom: 15, paddingRight: 8, width: 0, height: 0)

            addSubview(commentTimeLabel)
        commentTimeLabel.anchor(top: commentLabel.bottomAnchor, left: commentLabel.leftAnchor, bottom: nil, right: nil, paddingTop: 3, paddingLeft: 1, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)



            optionsButton.isEnabled = true

            optionsButton.isUserInteractionEnabled = true

            commentLabel.isUserInteractionEnabled = true
        }

        required init?(coder aDecoder: NSCoder) {
            fatalError("init(coder:) has not been implemented")
        }

这是CommentViewController代码，应该为我调整单元格的大小，但实际上没有。我以前曾经使用过它，所以不确定是否丢失任何东西

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


           let frame = CGRect(x: 0, y: 0, width: view.frame.width, height: 50)
           let dummyCell = CommentCell(frame: frame)
           dummyCell.comment = comments[indexPath.item]
           dummyCell.layoutIfNeeded()

           let targetSize = CGSize(width: view.frame.width, height: 1000)
           let estimatedSize = dummyCell.systemLayoutSizeFitting(targetSize)

           let height = max(40 + 8 + 8, estimatedSize.height)
           return CGSize(width: view.frame.width, height: height)
    }


    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        return 15
    }

Answer 1

您需要设置

commentLabel.lineBreakMode = .byWordWrapping

默认情况下，它设置为.byTruncatingTail。

如果要将文本限制为一定的行数，也可能需要设置.numberOfLines