Using enums to build a reliable section model

SimpleSectionsViewController.swift

import UIKit
import MessageUI

class SimpleSectionsViewController: UITableViewController {

    enum UserInfoRow {
        case name
    }
    enum ContactInfoRow {
        case email
        case github
    }
    
    enum Section {
        case userInfo(_ rows:[UserInfoRow])
        case contactInfo(_ rows:[ContactInfoRow])
    }
    
    private var sections:[Section] = []
    
    // MARK: - UITableViewController
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell") ?? UITableViewCell.init(style: .subtitle, reuseIdentifier: "Cell")
        
        switch sections[indexPath.section] {
        
        case .contactInfo(let rows):
            
            switch rows[indexPath.row] {
                
            case .email:
                cell.textLabel?.text = "Email"
                cell.detailTextLabel?.text = "[email protected]"
                cell.selectionStyle = .none
                
            case .github:
                cell.textLabel?.text = "Github"
                cell.detailTextLabel?.text = "github.com/goergisn"
                
            }
            
        case .userInfo(let rows):
            
            switch rows[indexPath.row] {
            case .name:
                cell.textLabel?.text = "Name"
                cell.detailTextLabel?.text = "Alex Guretzki"
                cell.selectionStyle = .none
            }
            
        }
        
        return cell
    }
    
    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        
        switch sections[section] {
        case .contactInfo(_): return "Contact"
        case .userInfo(_): return "User"
        }
        
    }
    
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        
        switch sections[indexPath.section] {
            
        case .contactInfo(let rows):
            
            switch rows[indexPath.row] {
                
                case .email:
                    
                    if MFMailComposeViewController.canSendMail() {
                     
                        let viewController = MFMailComposeViewController()
                        viewController.setToRecipients(["[email protected]"])
                        viewController.setSubject("Hello!")
                        viewController.setMessageBody("Great code!", isHTML: false)
                        self.present(viewController, animated: true, completion: nil)
                        
                    } else {
                        
                        print("Y u no have mail?")
                        
                    }
                
                case .github:
                    
                    if let url = URL.init(string: "https://github.com/goergisn") {
                        UIApplication.shared.open(url, completionHandler: nil)
                    }
                
                }
            
        case .userInfo(let rows):
            
            switch rows[indexPath.row] {
                
                case .name:
                    print("Can't touch this!")
                
            }
            
        }
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        switch sections[section] {
            case .contactInfo(let rows): return rows.count
            case .userInfo(let rows): return rows.count
        }
    }
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return sections.count
    }
    
    // MARK: - UIViewController
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        sections = [.userInfo([.name]),
                    .contactInfo([.email, .github])]
        
        self.title = "Simple Sections"
    }

}