ios - 当我使用 UITableViewCell 来自定义每个单元格内容时，在 Swift4 中滚动后屏幕布局被破坏

Question

我想在 UITableviewCell 中创建一个自定义单元格，以便我可以更改单元格内容以及从 ModelView 传递的参数。但是，当我滚动时，布局被破坏。

我尝试将代码分为两部分，如下所示。

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声明变量部分

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初始化部分包含布局定义

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但是，如果我分成 2 个部分，我将无法更改布局和变量，因为初始化部分首先在“声明变量部分”之前运行。此外，我尝试更改“声明变量部分”中的布局，布局已损坏。我应该如何编码来传递参数来更改单元格内容？下面是我的代码的一部分。 “baseView”的布局将会被破坏。

[ViewModel]
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let item = items[indexPath.section]
    if let item = item as? AnniversaryViewModelContentsItem, let cell = tableView.dequeueReusableCell(withIdentifier: ANContentCell.identifier, for: indexPath) as? ANContentCell {
        cell.selectionStyle = .none
        cell.item = item.contents[indexPath.row]

        cell.contentView.setNeedsLayout()
        cell.contentView.layoutIfNeeded()
        return cell
    }
    return UITableViewCell()
}

[Cell: ANContentCell]
    // Declare Variable Part ---------------------------------------------------------------------
   ........
   var item: ANContent? {
        didSet {
            guard let item = item?.dataPerRow else {
                return
            }
            let graphArray = [graph00, graph01, graph02, graph03]

            if item.mode == 1 {
                baseView.anchor(
                    top: self.safeAreaLayoutGuide.topAnchor,
                    leading: self.safeAreaLayoutGuide.leadingAnchor,
                    bottom: self.safeAreaLayoutGuide.bottomAnchor,
                    trailing: self.safeAreaLayoutGuide.trailingAnchor,
                    padding: .init(top: 0, left:0, bottom:0, right:0), size: .init(width:0, height: item.hight )
                )
            } 

            for i in 0...(graphArray.count - 1){
                // Graph Anchor
                graphArray[i].anchor(
                    top: baseView.safeAreaLayoutGuide.topAnchor,
                    leading: baseView.leadingAnchor,
                    bottom: nil,
                    trailing: nil,
                    padding: .init(
                        top: item.top,
                        left: item.left,
                        bottom:0,
                        right:0
                    ),
                    size: .init(
                        width:item.width,
                        height: item.height
                    )
                )
                .........
            }
        }
    }

    private let baseView: UIView = {
        var baseView = UIView()
        baseView.backgroundColor = .clear
        return baseView
    }()

    var graph00: UIView = {
        let graph = UIView()
        return graph
    }()
    var graph01: UIView = {
        let graph = UIView()
        return graph
    }()
    var graph02: UIView = {
        let graph = UIView()
        return graph
    }()
    var graph03: UIView = {
        let graph = UIView()
        return graph
    }()

    // Init parts ---------------------------------------------------------------------
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)

        let graphArray = [graph00, graph01, graph02, graph03]

        // Add Object
        addSubview(baseView)
        for i in 0...(graphArray.count - 1){
            baseView.addSubview(graphArray[i])
        }
    }

Answer 1

尝试替换::

var graph00: UIView = {
        let graph = UIView()
        return graph
}()

至:

var graph00 = UIView()

并将此代码添加到您的单元格中:

override func layoutIfNeeded() {
        self.subviews.forEach{$0.layoutIfNeeded()}
}