slide-up-menu-options-manager-show-options.swift

extension HomeOptionsManager {
    
    /// Configures options view and add to screen
    public func showOptions() {
        guard backgroundView == nil else { return }
        guard let window = UIApplication.shared.windows.first else { return }
        
        /// The background view that covers the entire screen
        let backgroundView = UIView(frame: window.bounds)
        backgroundView.backgroundColor = .black
        backgroundView.alpha = 0
        window.subviews(backgroundView)
        backgroundView.fillContainer()
        
        /// The actual clickable options table view
        let optionsTableView = UITableView(frame: .zero, style: .plain)
        optionsTableView.isScrollEnabled = false
        optionsTableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
        optionsTableView.delegate = self
        optionsTableView.dataSource = self
        backgroundView.subviews(optionsTableView)
        
        optionsTableView
            .height(tableViewHeight)
            .leading(0)
            .trailing(0)
        optionsTableView.Width == backgroundView.Width
        optionsTableView.Bottom == backgroundView.Bottom + tableViewHeight
        optionsTableView.backgroundColor = .white
        optionsTableView.alpha = 1
        
        let backgroundTapGesture = UITapGestureRecognizer(target: self, action: #selector(didTapBackground))
        backgroundView.isUserInteractionEnabled = true
        /// Ensures the tap is passed on to its subviews
        backgroundTapGesture.cancelsTouchesInView = false
        backgroundView.addGestureRecognizer(backgroundTapGesture)
        
        self.backgroundView = backgroundView
        self.optionsView = optionsTableView
        
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
            optionsTableView.bottomConstraint?.constant = 0
            
            UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.8, animations: {
                
                /// Introduces half alpha and forces a layout pass
                backgroundView.alpha = 0.5
                backgroundView.layoutIfNeeded()
                
            }) { (complete) in
                
                self.optionsDidOpen?()
                
            }
        }
    }
    
}