根据标头UITextview内容更新UICollectionView标头高度

Question

我有一个UICollectionViewController标题单元格,显示业务信息.

企业可能有也可能没有描述.

在我的标题单元格中,我设置了一个业务对象,然后设置标签的所有文本等.在这里我也尝试根据这篇文章计算所需的文本字段高度

我需要的是实际设置我的标题单元格高度UICollectionViewController在它使用的位置.

BusinessDetailHeader 类:

    var maxTextViewHeight: CGFloat = 0

    var business: Business? {
        didSet {
            guard let imageUrl = business?.logoUrl else {return}

            let url = URL(string: imageUrl)
            logoView.kf.setImage(with: url)
            headerImageView.kf.setImage(with: url)

            guard let businessName = business?.name else {return}
            guard let address = business?.address else {return}
            guard let hoursOfOperation = business?.hoursOfOperation else {return}
            guard let phoneNumber = business?.phoneNumber else {return}

            businessNameLabel.text = businessName
            addressLabel.text = address
            hoursofOperationLabel.text = hoursOfOperation
            phoneNumberLabel.text = phoneNumber

            if let description = business?.description {
                detailsTextField.text = description
                let amountOfLinesToBeShown:CGFloat = 6
                if let height = detailsTextField.font?.lineHeight {
                    maxTextViewHeight = height * amountOfLinesToBeShown
                }
            }
        }
    }

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

    fileprivate func layoutViews() {
        addSubview(headerImageView)
        headerImageView.anchor(top: topAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 130)

        //ADJUST DETAIL HEIGHT HERE BASED ON CALCULATED HEIGHT FOR TEXTVIEW
        addSubview(detailView)
        detailView.anchor(top: headerImageView.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 200+maxTextViewHeight)

        detailView.addSubview(businessNameLabel)
        businessNameLabel.anchor(top: logoView.bottomAnchor, left: nil, bottom: nil, right: nil, paddingTop: 4, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
        businessNameLabel.centerXAnchor.constraint(equalTo: detailView.centerXAnchor).isActive = true

        detailView.addSubview(detailsTextField)
        detailsTextField.anchor(top: businessNameLabel.bottomAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: maxTextViewHeight)


        detailView.addSubview(addressLabel)
        addressLabel.anchor(top: detailsTextField.bottomAnchor, left: nil, bottom: nil, right: nil, paddingTop: 4, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
        addressLabel.centerXAnchor.constraint(equalTo: detailView.centerXAnchor).isActive = true

        detailView.addSubview(hoursofOperationLabel)
        hoursofOperationLabel.anchor(top: addressLabel.bottomAnchor, left: nil, bottom: nil, right: nil, paddingTop: 4, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
        hoursofOperationLabel.centerXAnchor.constraint(equalTo: detailView.centerXAnchor).isActive = true

        detailView.addSubview(phoneNumberLabel)
        phoneNumberLabel.anchor(top: hoursofOperationLabel.bottomAnchor, left: nil, bottom: nil, right: nil, paddingTop: 4, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
        phoneNumberLabel.centerXAnchor.constraint(equalTo: detailView.centerXAnchor).isActive = true

    }

高度正确更新没有问题,但有时当高度太大时,文本和所有后面的元素溢出标题单元格.我认为这与我如何解决我的细胞高度有关UICollecitonViewController.
我设置它的高度是这样的:

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {

    return CGSize(width: view.frame.width, height: 330)
}

330的高度需要是动态的.这可能吗？我应该像这样设置高度属性吗？我看到了这样的帖子一个是尝试解决这一点,但似乎是解决方案并不像他们是最好的.

Answer 1

请检查此链接，它对于如何使 UIcollectionView 标题动态高度非常有帮助？。基本上你需要根据你的要求设置自动布局约束；需要在referenceSizeForHeaderInSection（collectionViewFlowLayout delegate）方法中调用setNeedlayout()。