Warning from iOS “Do not add subviews directly to the visual effect view itself”

Question

I have a function below and when I link with the iOS 11 SDK, I get an error:

Do not add subviews directly to the visual effect view itself, instead ad

Answer 1

let messageFrame = UIView()
var activityIndicator = UIActivityIndicatorView()
var strLabel = UILabel()
effectView = UIView()

   func activityIndicator(_ title: String) {

    strLabel.removeFromSuperview()
    activityIndicator.removeFromSuperview()
    effectView.removeFromSuperview()

    strLabel = UILabel(frame: CGRect(x: 50, y: 0, width: 160, height: 46))
    strLabel.text = title
    strLabel.font = UIFont.systemFont(ofSize: 14, weight: UIFontWeightMedium)
    strLabel.textColor = UIColor(white: 0.9, alpha: 0.7)

    effectView.frame = CGRect(x: view.frame.midX - strLabel.frame.width/2, y: view.frame.midY - strLabel.frame.height/2 , width: 160, height: 46)
    effectView.layer.cornerRadius = 15
    effectView.layer.masksToBounds = true

    activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .white)
    activityIndicator.frame = CGRect(x: 0, y: 0, width: 46, height: 46)
    activityIndicator.startAnimating()

    effectView.addSubview(activityIndicator)
    effectView.addSubview(strLabel)
    view.addSubview(effectView)
}

when start :

     activityIndicator("Your Text")

when Finished :

    self.effectView.removeFromSuperview()