Why button appears only on the second attempt?

Question

I'm trying to add a function that will show the close button in my custom alert view. When I call it for the first time, only an empty area appears that does not contain a button (no color, no text and no pressing). When you call again - everything works as it should.

It does not depend on the parameter animated, in both cases it works the same.

My dialogView is a my custom UIView. I don't use UIAlertController

What could be the problem?

initial view after the first attempt second attempt
GIF call func by click

func showCloseButton(text: String, animated: Bool){
        let dialogViewHeight = self.dialogView.frame.height + 50 + 1

        let button = UIButton(type: .roundedRect)
        button.backgroundColor = .red
        button.frame.origin = CGPoint(x: 0, y: dialogViewHeight)
        button.frame.size = CGSize(width: self.dialogView.frame.width, height: 50)
        button.setTitle(text, for: .normal)
        button.addTarget(self, action: #selector(closeTapped), for: .touchUpInside)

        let separatorLineView = UIView()
        separatorLineView.frame.origin = CGPoint(x: 0, y: self.dialogView.frame.height)
        separatorLineView.frame.size = CGSize(width: dialogView.frame.width, height: 1)
        separatorLineView.backgroundColor = UIColor.groupTableViewBackground
        dialogView.addSubview(separatorLineView)

        if animated {
            animateAdjustDialogView(height: dialogViewHeight){
                Logger.Log("completion did")
                self.dialogView.addSubview(button)
            }
        } else {

            Logger.Log("button.frame.origin = \(button.frame.origin)")
            Logger.Log("button.frame.size = \(button.frame.size)")
            Logger.Log("button.title = \(button.titleLabel)")

            self.dialogView.frame.size = CGSize(width: self.dialogView.frame.width, height: dialogViewHeight)
            self.dialogView.addSubview(button)
        }
    }

private func animateAdjustDialogView(height: CGFloat, completion: (()->Void)?){
        UIView.animate(withDuration: 1.0, animations: {
            self.dialogView.frame.size = CGSize(width: self.dialogView.frame.width, height: height)
            self.layoutIfNeeded()
        }) { (finished) in
            Logger.Log("finished = \(finished)")
            if finished {
                Logger.Log("completion run")
                completion?()
            }
        }
    }

Answer 1

Button frame is causing the issue -

button.frame.origin = CGPoint(x: 0, y: dialogViewHeight)

Where

let dialogViewHeight = self.dialogView.frame.height + 50 + 1 

That means, button goes beyond dialogView frame.

So replace

button.frame.origin = CGPoint(x: 0, y: dialogViewHeight)

With

button.frame.origin = CGPoint(x: 0, y: dialogViewHeight - 50) // Height of the Button.

Let me know if you are still having any issue.