帶有CAShapeLayer的UIButton使滾動時標題消失

Question

我有一個ProfileCollectionViewCell用一種方法：

func configureCellWithProfile(profile: Profile) {

    shapeLayer.removeFromSuperlayer()

    let path = CGPathCreateMutable()

    CGPathMoveToPoint(path, nil, 0, 0)
    CGPathAddLineToPoint(path, nil, CGRectGetWidth(likeButton.frame), 0)
    CGPathAddLineToPoint(path, nil, CGRectGetWidth(likeButton.frame), CGRectGetHeight(likeButton.frame))
    CGPathCloseSubpath(path)

    shapeLayer.fillColor = profile.favourite ? UIColor.brilliantRose().CGColor : UIColor.blackSqueeze().CGColor
    shapeLayer.path = path

    likeButton.layer.masksToBounds = true
    likeButton.layer.addSublayer(shapeLayer)
}

加載后，它看起來像這樣：

但是在我滾動標題（icomoon字體的心）后消失了：

為什么？

Answer 1

我解決了問題，替換為：

likeButton.layer.addSublayer(shapeLayer)

同

likeButton.layer.insertSublayer(shapeLayer, below: likeButton.titleLabel?.layer)