Sugary Button. - its appearance could be disable but be able to be tapped to show alert view.

UIButton+Extensions.swift

// its appearance could be disable but be able to be tapped to show alert view.
private extension UIControlState {
    private static let localScope = UIControlState.application.rawValue | 0x0000FF00
    static var normalState = UIControlState(rawValue: localScope | 1 << 1)
    static var blockingState = UIControlState(rawValue: localScope | 1 << 2)
}

extension UIButton {
      var isBlocked: Bool = false {
        didSet {
            if isBlocked {
                setImage(image(for: .blockingState), for: .normal)
            }
            else {
                setImage(image(for: .normalState), for: .normal)
            }
        }
    }
}