swift – iOS label is invisible throughout viewWillAppear, backing from a pushed view controller

I’ve a button with 2 icons and a label. The button has a distinct background colour for .chosen state. After I click on the button, the button is chosen and a brand new ViewController is pushed. I am attempting to imitate the behaviour of UITableViewCell.setSelected(animated:), so when the consumer backs out from the brand new ViewController I would like the background colour to animate. I take advantage of this:

UIView.transition(with: button, period: 0.3, choices: .transitionCrossDissolve) { button.isSelected = false }

It really works positive once I put it in viewDidAppear however it is a bit too late so I would like it in viewWillAppear. Downside is once I do it from viewDidAppear, the label on my button begins as clear. The icons are positive and static however the label will animate from clear to its colour. Why? How I can forestall this?

Here’s a small demo:

import UIKit

class ViewController: UIViewController {
    var myButton: MyButton?

    override func viewDidLoad() {
        tremendous.viewDidLoad()
        myButton = MyButton()
        view.addSubview(myButton!)
        myButton?.body.origin.x = 200
        myButton?.body.origin.y = 200
        myButton?.addAction(.init { [weak self] _ in
            self?.myButton?.isSelected = true
            self?.navigationController?.pushViewController(ViewController2(), animated: true)
        }, for: .touchUpInside)
    }

    override func viewWillAppear(_ animated: Bool) {
        tremendous.viewWillAppear(animated)
        UIView.transition(with: myButton!, period: 3, choices: .transitionCrossDissolve) { self.myButton!.isSelected = false }

    }
    
//    override func viewDidAppear(_ animated: Bool) {
//        tremendous.viewDidAppear(animated)
//        UIView.transition(with: myButton!, period: 3, choices: .transitionCrossDissolve) { self.myButton!.isSelected = false }
//
//    }

}
class ViewController2: UIViewController {
    
    override func viewDidLoad() {
        tremendous.viewDidLoad()
        view.backgroundColor = .white
    }
    
}

class MyButton: UIButton {
    
    let label = UILabel("Hahahaha", font: .systemFont(ofSize: 14), textColor: .black)

    comfort init() {
        self.init(body: .init(x: 0, y: 0, width: 200, top: 200))
        
        setBackgroundColor(colour: .white, forState: .regular)
        setBackgroundColor(colour: .grey, forState: .highlighted)

        setBackgroundColor(colour: .grey, forState: .chosen)

        addSubview(label)
        label.body.origin = .init(x: 40, y: 40)
        
        

    }
}

extension UIButton {
    func setBackgroundColor(colour: UIColor, forState: UIControl.State) {
        self.clipsToBounds = true
        UIGraphicsBeginImageContext(CGSize(width: 1, top: 1))
        if let context = UIGraphicsGetCurrentContext() {
            context.setFillColor(colour.cgColor)
            context.fill(CGRect(x: 0, y: 0, width: 1, top: 1))
            let colorImage = UIGraphicsGetImageFromCurrentImageContext()
            UIGraphicsEndImageContext()
            self.setBackgroundImage(colorImage, for: forState)
        }
    }
}

extension UILabel {
    comfort init(_ textual content: String = "", font: UIFont? = nil, textColor: UIColor? = .black) {
        self.init()
        self.textual content = textual content
        self.font = font
        sizeToFit()
        self.textColor = textColor
    }
}

Strive backing out from ViewController2 , see label begins invisible. Now remark out the viewWillAppear and use viewDidAppear as a substitute, the label begins black.