code for initial view controller

shwifty.swift

//
//  VotesTableViewController.swift
//  Voting
//
//  Created by Stephan Fitzpatrick on 12/16/16.
//  Copyright © 2016 Stephan Fitzpatrick. All rights reserved.
//

import UIKit

class VotesTableViewController: UITableViewController {
    
    // set a variables for the votes
    var votes: [Vote] = [Vote]()
    
    // this is the event url constant
    let eventURL = api.eventURLFor(id: 1)
    
    //@IBOutlet weak var tableView: UITableView!
    

    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.title = "Votes"
        
        let url = URL(string: eventURL)
        let task = URLSession.shared.dataTask(with: url!) { data, response, error in
            guard error == nil else {
                print(error as Any)
                return
            }
            guard let data = data else {
                print("Data is empty")
                return
            }
            
            // update votes
            self.votes = self.votesFromData(data: data)
            
            // update UI
            DispatchQueue.main.async {
                self.tableView.reloadData()
            }
            
        }
        
        task.resume()
    }
    
    

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.votes.count
    }
    
    func votesFromData(data: Data?) -> [Vote] {
        // No data, return an empty array
        guard let data = data else {
            return []
        }
        
        // Parse the Data into a JSON Object
        let JSONObject = try! JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions(rawValue: 0))
        
        // Insist that this object must be a dictionary
        guard let JSONDictionary = JSONObject as? [String : Any] else {
            assertionFailure("Failed to parse data. data.length: \(data.count)")
            return [Vote]()
        }
        
        // Print the object, for now, so we can take a look
        //print(JSONDictionary)
        
        // Pretty Print the string, for debugging
        let prettyData = try! JSONSerialization.data(withJSONObject: JSONObject, options: .prettyPrinted)
        let prettyString = String(data: prettyData, encoding: String.Encoding.utf8)
        print(prettyString!)
        
        // convert votes into an array of dictionaries
        let voteDictionaries = JSONDictionary["votes"] as! [[String : Any]]
        
        let votes = voteDictionaries.map {
            Vote(dictionary: $0)!
        }
        
        return votes
        
    }

    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)

        let vote = self.votes[indexPath.row]
        
        cell.textLabel!.text = "\(vote.name) -> \(vote.count)"

        return cell
    }
 

    /*
    // Override to support conditional editing of the table view.
    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        // Return false if you do not want the specified item to be editable.
        return true
    }
    */

    /*
    // Override to support editing the table view.
    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            // Delete the row from the data source
            tableView.deleteRows(at: [indexPath], with: .fade)
        } else if editingStyle == .insert {
            // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
        }    
    }
    */

    /*
    // Override to support rearranging the table view.
    override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {

    }
    */

    /*
    // Override to support conditional rearranging of the table view.
    override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
        // Return false if you do not want the item to be re-orderable.
        return true
    }
    */

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */

}