CAGradientLayer overflows on UIView when using in UITableViewCell - ios

Question

I've add CAGradientLayer to a UIView that've already inside in UITableViewCell. This UIView has 20 trailing and leading space from the UITableViewCell contentView. But that UIView's overflow when it running.
var gradientLayer: CAGradientLayer!
#IBOutlet weak var view: UIView!
func createGradientLayer() {
gradientLayer = CAGradientLayer.init(layer: view.layer)
gradientLayer.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height)
// gradientLayer.frame = CGRect(x: 0, y: 0, width: self.contentView.frame.size.width, height: )
let colory: UIColor = UIColor(red: 0, green: 189/255, blue: 237/255, alpha: 1.0)
gradientLayer.colors = [UIColor.ceruleanBlue.cgColor, colory.cgColor]
gradientLayer.startPoint = CGPoint.init(x: 0.0, y: 0.5)
gradientLayer.endPoint = CGPoint(x:1.0,y: 0.5)
// self.view.layer.mask = gradientLayer
self.view.layer.insertSublayer(gradientLayer, at: 0)
}
Then in the cellForRow method, I used like this:
if indexPath.row == 0{
let cell = tableView.dequeueReusableCell(withIdentifier: "statisticsCell") as! StatisticsCommentCell
// cell.frame.size.width = UIScreen.main.bounds.size.width
cell.view.translatesAutoresizingMaskIntoConstraints = false
return cell
}
If I changed gradientLayer.frame like below:
gradientLayer.frame.size.width = self.view.frame.width
the gradientView is not overflow but there seems just ceruleanBlue color.
I do not any idea how can I solve this problem for my UIView.
Any idea? Thanks in advance.
Its a screenshot from the simulator that have overflow problem:
Hint: Normally the UIView has already trailing and leading from the UITableViewCell's contentView.
Another problem is when I add maskToBounds the view seems like below
All constraints for UIView

Answer 1

Set your gradientLayer as optional, instead of var gradientLayer: CAGradientLayer! use var gradientLayer: CAGradientLayer? and add this code in your cellLayoutSubViews method
Use this code
override func layoutSubviews() {
super.layoutSubviews()
if(self.gradientLayer == nil){
self.gradientLayer = CAGradientLayer(layer: self.view.layer)
//your gradient configuration
self.layer.addSublayer(self.gradientLayer!)
}
self.gradientLayer?.drawsAsynchronously = true
self.gradientLayer?.frame = self.view.bounds
}