UICollectionViewCell 在 select 上未更改颜色

Question

我正在尝试拥有一个 collectionView，用户可以在其中 select 多个单元格，并让它们 highlight/deselect 它们。我似乎无法弄清楚如何在点击单元格时更改单元格的背景颜色。

这里是我设置集合视图的地方：

let extraCollectionView = UIView()
 let flowLayout = UICollectionViewFlowLayout()

        extraCollectionView.frame = CGRect(x:self.view.frame.size.width * 1.5, y:self.view.frame.size.height / 6.5, width: self.view.frame.width / 1.3, height: self.view.frame.height / 1.35)


        extraCollectionView.backgroundColor = UIColor.clear
        self.view.addSubview(extraCollectionView)


        let collectionView = UICollectionView(frame: CGRect(x: extraCollectionView.frame.width * 0, y:extraCollectionView.frame.height * 0, width: extraCollectionView.frame.width, height: extraCollectionView.frame.height), collectionViewLayout: flowLayout)


        collectionView.register(uploadGenreSelectionCVC.self, forCellWithReuseIdentifier: cellId)
        collectionView.delegate = self
        collectionView.dataSource = self

        collectionView.layer.cornerRadius = collectionView.layer.frame.width / 10
        collectionView.backgroundColor = UIColor.clear
        collectionView.layer.borderColor = UIColor.blue.cgColor
        collectionView.layer.borderWidth = 3
        collectionView.allowsMultipleSelection = true
        extraCollectionView.addSubview(collectionView)

这是我的 collectionView 代码：

 func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 15
    }



    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
    {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! uploadGenreSelectionCVC

        cell.layer.borderColor = UIColor.blue.cgColor
        cell.layer.borderWidth = 2
        cell.backgroundColor = UIColor.clear


        return cell
    }

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

        let width = (collectionView.bounds.width) / 3
        let height = (collectionView.bounds.height) / 5

        return CGSize(width:width, height:height)
    }


    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
        return 0
    }

    func collectionView(_ collectionView: UICollectionView,
                        layout collectionViewLayout: UICollectionViewLayout,
                        minimumLineSpacingForSectionAt section: Int) -> CGFloat {
        return 0
    }




    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! uploadGenreSelectionCVC

        print("yo")
        cell.contentView.layer.backgroundColor = UIColor.red.cgColor
    }

&& 这是单元格本身

 let genreLabel = UILabel()

    override func draw(_ rect: CGRect) {

        genreLabel.frame = CGRect(x: self.frame.size.width * 0, y: self.frame.size.height/2.7, width: self.frame.size.width, height: self.frame.size.height / 3)
        genreLabel.text = "Rap"
        genreLabel.textColor = UIColor.white
        genreLabel.textAlignment = .center


        addSubview(genreLabel)
    }

我忘了做什么？？

Answer 1

在您的单元格中覆盖 isSelected，并根据值自定义您的单元格，

override var isSelected: Bool {
    didSet {
        self.backgroundColor = isHighlighted ? .lightGray : .clear
    }
}

注意：此属性由collectionView

自动设置

UICollectionViewCell 在 select 上未更改颜色

UICollectionViewCell not changing colors on select

uicollectionview

uicollectionviewcell

uicollectionviewlayout

swift

swift3