出列后，CALayer在Custom UITableViewCell NIB上消失

Question

我有一个UITableView，其中每一行都是自定义XIB。一行有4个UIButton，它们是选项，如问题，信息等。当点击UIButton时，我在CALayer中显示动画。当表格视图滚动时，CALayer被删除，即动画消失了。

点击按钮时，我会打开CALayer并开始动画。当滚动或更新表格时，如何确保CALayer不会消失？

class ReasonForSupportTableViewCell: UITableViewCell {

    let animationView = AnimationView()
    var hasButtonBeenTapped = false
    var previousButtonTapped: UIButton? = nil

    //IBOutlets
    @IBOutlet weak var questionButton: UIButton!
    @IBOutlet weak var informationButton: UIButton!
    @IBOutlet weak var crashButton: UIButton!
    @IBOutlet weak var bugButton: UIButton!

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code

        //set initial button
        questionButton.sendActions(for: .touchUpInside)

    }

    func createView(sender: UIButton) {

        //draw the frame
        animationView.frame = CGRect(x: 0, y: 0, width: 75.0, height: 75.0)

        //change the view background color
        animationView.backgroundColor = UIColor.clear
        animationView.isUserInteractionEnabled = false

        //add the view.
        sender.addSubview(animationView)


    }

    @IBAction func buttonTapped(_ sender: UIButton) {


        if previousButtonTapped == nil {

            //you haven't tapped a button yet

            createView(sender: sender)
            animationView.animateTo()

            previousButtonTapped = sender

        } else if previousButtonTapped == sender {

            animationView.removeAnimation()
            previousButtonTapped = nil

        } else {

            animationView.removeAnimation()

            createView(sender: sender)
            animationView.animateTo()

            previousButtonTapped = sender

        }

    }

}

Answer 1

子类UIButton在初始化时添加CALayer，而不是在点击按钮时添加。然后，您可以使用prepareForReuse()函数来停止任何动画。