将collectionview单元格移动到随机点，并在点击时仍触发didselectitem

Question

我正在尝试在集合视图中将单元格连续移动到随机点。 我在下面创建了函数，但它的动作很奇怪，并且didSelectItemAt方法有时不会被调用。  有什么方法可以使动画更加平滑，并在用户点击单元格时仍然触发didSelectItemAt方法。

    func randomPointAnimation(start: CGPoint, view: UICollectionViewCell ,collectionView: UICollectionView) {
    var toX: CGFloat = 0.0
    var toY: CGFloat = 0.0
    let backView = collectionView
    toX = randomXPoint(point: start.x, view: backView)
    toY = randomYPoint(point: start.y, view: backView)
    let randomTo = CGPoint(x: toX, y: toY)
    let control1 = randomControlPoint(x1: start, x2: randomTo)
    let control2 = randomControlPoint(x1: start, x2: randomTo)
    let path = createCurvePath(start: start, to: randomTo, control1: CGPoint(x: control1.x, y: control1.y), control2: CGPoint(x: control2.x, y: control2.y))
    let shapeLayer = CAShapeLayer()
    shapeLayer.path = path.cgPath
    shapeLayer.strokeColor = UIColor.blue.cgColor
    shapeLayer.fillColor = UIColor.clear.cgColor
    shapeLayer.lineWidth = 1.0
    self.view.layer.addSublayer(shapeLayer)

    let moveAlongPath = CAKeyframeAnimation(keyPath: "position")
    let curvePath = path
    moveAlongPath.path = curvePath.cgPath
    moveAlongPath.duration = 3
    moveAlongPath.calculationMode = CAAnimationCalculationMode.paced
    moveAlongPath.timingFunctions = [CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeOut)]

    CATransaction.begin()
    CATransaction.setCompletionBlock({
        self.randomPointAnimation(start: randomTo, view: view, collectionView: backView)
    })
    let layer = createLayer(view: view)
    layer.add(moveAlongPath, forKey: "animate along Path")
    CATransaction.commit()
}