Question

在tableView Cell类中，我使用didSet方法设置UI值，并且在其中有一个来自api的字符串数组，用于创建按钮数组并将其附加到UIStackView

var pollDataInPollCell: PollModel? {
    didSet{
        if let pollOptions = pollDataInPollCell?.poll_detail {
           //sample pollOptions = ["Button1","Button2","Button3","Button4"]
            for index in pollOptions {
                let bt = UIButton(type: .system)
                bt.setTitleColor(.blue, for: .normal)
                bt.setTitle(index, for: .normal)
                optionBtnStackView.addArrangedSubview(bt)
            }
        }
    }
}

我在didSet之外的stackView

var optionBtnStackView: UIStackView = {
    let sv = UIStackView()
    sv.axis = .vertical
    sv.distribution = .fillEqually
    sv.spacing = 5
    return sv
}()

一切在启动时都很好用，但是，当我上下滚动时，我的stackview又增加了4个按钮。它在启动时有4个，然后是8个，然后是12个，每当我上下滚动我的应用程序时，它就会增加4个。我知道问题出在tableView dequeueReusableCell，但是我找不到解决此问题的方法。有什么建议么？谢谢。

Answer 1

在didSet中使用以下代码

var pollDataInPollCell: PollModel? {
    didSet{
        for view in optionBtnStackView.subviews {
            optionBtnStackView.removeArrangedSubview(view)
            view.removeFromSuperview()
        }
        if let pollOptions = pollDataInPollCell?.poll_detail {
           //sample pollOptions = ["Button1","Button2","Button3","Button4"]
            for index in pollOptions {
                let bt = UIButton(type: .system)
                bt.setTitleColor(.blue, for: .normal)
                bt.setTitle(index, for: .normal)
                optionBtnStackView.addArrangedSubview(bt)
            }
        }
    }
}

UIStackView在tableView单元格didSet内添加安排子视图

1 个答案: