UICollectionViewcell selectedBackgroundView大于单元格

Question

我已经使用xib设计的自定义单元实现了UICollectionView。现在，我尝试使selectedBackgroundView大于原始cell。

我尝试将单元格的clipsToBounds更改为false（也是在绝望的内容视图中，背景视图，selectBackgroundView＆＃39; s），但是没有效果。

是否可以拥有selectedBackgroundViewBigger而不是单元格？

class MyCell: UICollectionViewCell {
    static let nibName = "MyCell"
    static let cellIdentifier = "MyCellIdentifier"

    private var oneTimeSetup = false

    @IBOutlet weak var image: UIImageView!
    @IBOutlet weak var label: UILabel!

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

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
    }

    func commonInit() {
        let margin: CGFloat = -20

        let backgroundView = UIView.init(frame: self.bounds)
        backgroundView.backgroundColor = UIColor.eventTypeCellBackground()
        self.backgroundView = backgroundView

        let biggerBounds = CGRect(x: margin, y: margin, width: self.bounds.width-margin*2, height: self.bounds.height-margin*2)
        let selectedBGView = UIView.init(frame: biggerBounds)
        selectedBGView.backgroundColor = UIColor.eventTypeCellBackgroundHighlited()
        self.selectedBackgroundView = selectedBGView

        self.clipsToBounds = false
        self.contentView.clipsToBounds = false
        self.backgroundView?.clipsToBounds = false
        self.selectedBackgroundView?.clipsToBounds = false
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        if !oneTimeSetup {
            label.textColor = UIColor.eventTypeLabelColor()
            oneTimeSetup = true
        }
    }
}