Subview Not Removing after Several "Remove View" Methods - swift

Question

I have this nice function that adds an activity indicator view, with a regular view behind it. When I add it, it adds fine. The problem is, when I try to remove it, nothing happens. I've tried:
.removeFromSuperview,
.isHidden = true and putting these methods in the main queue:
DispatchQueue.main.async() {
alertView.alpha = 0
alertView.removeFromSuperview()
activityIndicator.removeFromSuperview()
alertView.isHidden = true
activityIndicator.isHidden = true
}
I don't know what other methods to try...It seems all the other questions like this have one of the methods that I have as a solution. The function uses a boolean to determine whether or not to stop the activityIndicator. Here is my code:
static func showLoadingView(inViewController: UIViewController, turning: Bool){
let activityIndicator = UIActivityIndicatorView()
let alertView = UIView(frame: CGRect(x: activityIndicator.frame.origin.x, y: activityIndicator.frame.origin.y , width: 35, height: 35))
if(turning){
alertView.backgroundColor = UIColor(displayP3Red: 230, green: 230, blue: 230, alpha: 0.8)
alertView.layer.cornerRadius = 5
activityIndicator.center = alertView.center
inViewController.view.addSubview(alertView)
activityIndicator.activityIndicatorViewStyle = .gray
activityIndicator.startAnimating()
alertView.alpha = 0
activityIndicator.backgroundColor = UIColor.lightGray
alertView.center = inViewController.view.center
alertView.addSubview(activityIndicator)
alertView.transform = CGAffineTransform.init(scaleX: 1.3,y: 1.3)
UIView.animate(withDuration: 0.4) {
alertView.alpha = 1
alertView.transform = CGAffineTransform.identity
}
}
///////
else {
activityIndicator.stopAnimating()
alertView.transform = CGAffineTransform.init(scaleX: 1.3, y:1.3)
DispatchQueue.main.async() {
alertView.alpha = 0
alertView.removeFromSuperview()
activityIndicator.removeFromSuperview()
alertView.isHidden = true
activityIndicator.isHidden = true
}
print("Done")
}
}

Answer 1

You declared alertView which is out of scope when you called false.As a result, your call could not identify the alertView instance.
You can solve this issue in tow ways:
Declare your alertView outside of the function as a static.
static let activityIndicator = UIActivityIndicatorView()
static let alertView = UIView(frame: CGRect(x: activityIndicator.frame.origin.x, y: activityIndicator.frame.origin.y , width: 35, height: 35))
static func showLoadingView(inViewController: UIViewController, turning: Bool){}
In false case: find the subview using restorationIdentifier and remove.
static func showLoadingView(inViewController: UIViewController, turning: Bool){
if(turning){
let activityIndicator = UIActivityIndicatorView()
let alertView = UIView(frame: CGRect(x: activityIndicator.frame.origin.x, y: activityIndicator.frame.origin.y , width: 35, height: 35))
alertView.restorationIdentifier = "myalert"
alertView.backgroundColor = UIColor(displayP3Red: 230, green: 230, blue: 230, alpha: 0.8)
alertView.layer.cornerRadius = 5
activityIndicator.center = alertView.center
inViewController.view.addSubview(alertView)
activityIndicator.activityIndicatorViewStyle = .gray
activityIndicator.startAnimating()
alertView.alpha = 0
activityIndicator.backgroundColor = UIColor.lightGray
alertView.center = inViewController.view.center
alertView.addSubview(activityIndicator)
alertView.transform = CGAffineTransform.init(scaleX: 1.3,y: 1.3)
UIView.animate(withDuration: 0.4) {
alertView.alpha = 1
alertView.transform = CGAffineTransform.identity
}
}
///////
else {
for view in inViewController.view.subviews {
if (view.restorationIdentifier == "myalert") {
print("I FIND IT");
(view as! UIView).removeFromSuperview();
}
}
}
}