Can't add subview to UiButton-CodePudding

I try to create a custom button with custom subview, but untortunately button appears without this custom subview.

public class ButtonWithSubview: UIButton {
    
    private var customView = UIView()
    
    override public init(frame: CGRect) {
        super.init(frame: .zero)
        backgroundColor = UIColor.Player.roundedButtonBackground.withAlphaComponent(0.75)
        prepareCustomView()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    private func prepareCustomView() {
        customView.backgroundColor = UIColor.red.withAlphaComponent(0.8)
        customView.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(customView)
        self.addConstraints([
            customView.bottomAnchor.constraint(equalTo: self.bottomAnchor),
            customView.leftAnchor.constraint(equalTo: self.leftAnchor),
            customView.topAnchor.constraint(equalTo: self.topAnchor),
            customView.bottomAnchor.constraint(equalTo: self.bottomAnchor)
        ])
    }

}

I create this button inside a cell of UICollectionView like this:

private func prepareCustomButton() {
    customButton = ButtonWithSubview(.custom)
    customButton.setImage(UIImage(named: "play")?.resized(to: PlayerMetrics.playImageSize.value).withRenderingMode(.alwaysTemplate), for: .normal)
    customButton.contentEdgeInsets = UIEdgeInsets(top: 0, left: 6, bottom: 0, right: 0)
    customButton.translatesAutoresizingMaskIntoConstraints = false
    customButton.isUserInteractionEnabled = false
    
    contentView.addSubview(customButton)
    contentView.addConstraints([
        customButton.centerYAnchor.constraint(equalTo: contentView.centerYAnchor),
        customButton.centerXAnchor.constraint(equalTo: contentView.centerXAnchor),
        customButton.widthAnchor.constraint(equalToConstant: PlayerMetrics.largeButtonSize.value.width).withPriority(1000),
        customButton.heightAnchor.constraint(equalToConstant: PlayerMetrics.largeButtonSize.value.height).withPriority(1000)
    ])

}

I have no idea why custom View is not visible and actual it is not visible also in Debug View Hierarchy mode. Do you maybe have any suggestions?

CodePudding user response：

Wrap constraints inside

 NSLayoutConstraint.activate([
    // Here
 ])

Instead of self.addConstraints([---]) and contentView.addConstraints([---])