在CollectionViewCell中隐藏子视图不起作用

Question

我的CollectionViewCell上有一个进度层，用于显示下载进度，我想在下载完成后将其隐藏。但是以某种方式，当它进入假设要隐藏我的视图的if条件时，它不会隐藏。

我尝试将整个内容放入DispatchQueue.main.async中，但没有成功。我也尝试过放置self.setNeedsDisplay()或self.layoutIfNeeded()。我什至尝试了removeFromSuperLayer，但这些方法都无效，这里的解决方案有点用光了。当下载开始时，我的图层/视图确实出现，当完成时，什么也没发生。

我想念什么，这应该很容易T_T

class DownloadableCollectionViewCell: UICollectionViewCell {

    var bgPath: UIBezierPath!
    var shapeLayer: CAShapeLayer!
    var progressLayer: CAShapeLayer!

    var controlButton: UIButton!
    var lockIcon: UIImageView!

    var frameCenter: CGPoint {
        return CGPoint(x: self.frame.width/2, y: self.frame.height/2)
    }

    private var progress: Float = 0.0 {
        didSet(newValue) {

            progressLayer.strokeEnd = CGFloat(newValue)
            if newValue == 1 {
                progressLayer.isHidden = true
                controlButton.isHidden = true
                lockIcon.isHidden = true
            } else {
                progressLayer.isHidden = false
                controlButton.isHidden = false
            }
        }
    }

    public func setProgress(progress: Float) {
        self.progress = progress
    }

在TableViewCell中设置进度，CollectionView持有 func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { let audioItem = self.listItems[indexPath.row] let cell = collectionView.cellForItem(at: indexPath) as! AudioCollectionViewCell if audioItem.isDownloaded { // Go to next screen print("Downloaded already!") } else { self.downloadAudio(audioPath: audioItem.imageName) { (task) in task.observe(.progress) { snapshot in let progress = Float(snapshot.progress!.fileCompletedCount ?? 1) / Float(snapshot.progress!.fileTotalCount ?? 1) cell.setProgress(progress: progress) if progress == 1 { self.listItems[indexPath.row].isDownloaded = true } } } } }

var apiPromise = function (url) {
    var deferred = $q.defer();
    $http.get(url)
        .then(function (result) {
            deferred.resolve(result.data);
            return;
        });
    return deferred.promise;
};

this.GetExistingStudentTest=function(studentid){
    return apiPromise('http://localhost:65196/api/PS/GetStudentTests?studentid=' + studentid + '&testid=2')
};

this.GetExistingStudentTestScores = function (testid) {
    return apiPromise('http://localhost:65196/api/PS/GetStudentTestScore?testid=' + testid)
};