ios - 为什么在 UITableViewCell 中修改此 CALayer 会导致讨厌的图形故障？

Question

在我的cellForRowAtIndexPath方法中，我设置了图像上layer的cornerRadius:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("feedCell")!

    if self.pictunes?.count > 0 {
        // There are some pictunes to show; Create and update the posts
        if self.pictuneImages.count > indexPath.row {

            // We have an image for the user who made the current pictune
            if let pictunerImageView = cell.contentView.viewWithTag(2) as? UIImageView {
                pictunerImageView.layer.cornerRadius = 17.5 // Cut it to a circle
                pictunerImageView.image = self.pictunerImages[0]
            }

            // We also have an image for the pictune at the current post
            if let pictuneImageView = cell.contentView.viewWithTag(1) as? UIImageView {
                pictuneImageView.image = self.pictuneImages[indexPath.row]

            }
        }
        return cell
    } else {
        // No pictunes have loaded yet; We probably need more time
        // to load the image and audio assets for some of them
        cell.textLabel!.text = "No Pictunes Available Yet"
        return cell
    }
}

但是当我滚动时，我看到了这个令人讨厌的背景效果:

我该如何消除这种影响？清除背景上下文根本没有帮助。谢谢!

Answer 1

设置:

pictunerImageView.layer.masksToBounds = true

之后:

pictunerImageView.layer.cornerRadius = 17.5

您也可以将其更改为:

pictunerImageView.layer.cornerRadius = pictunerImageView.frame.size.height *0.5

如果您想更改大小但仍希望它是圆形。