MyFriendsController.swift

import UIKit
import Foundation
import Alamofire

class MyFriendsController: UITableViewController {
    var refresher: UIRefreshControl!
    var myFriendsInfo: [PersonInfo] = []
    
    @IBOutlet weak var navigationBar: UINavigationItem!
    var myActivityIndicator = UIActivityIndicatorView(activityIndicatorStyle:UIActivityIndicatorViewStyle.gray)
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        refresher = UIRefreshControl()
        refresher.addTarget(self, action: #selector(MyFriendsController.populate), for: .valueChanged)
        tableView.addSubview(refresher)
        self.getFriendsList()
        
        self.myActivityIndicator.hidesWhenStopped = true
        view.addSubview(self.myActivityIndicator)
        
        let barButtonItem = UIBarButtonItem(customView: self.myActivityIndicator)
        self.navigationBar.rightBarButtonItem = barButtonItem
    }
    
    func addRefreshHeader() {
        self.myActivityIndicator.startAnimating()
    }
    
    func removeRefreshHeader() {
        self.myActivityIndicator.stopAnimating()
        //self.navigationBar.rightBarButtonItem = nil
    }
    
    func getFriendsList() {
        let result = Alamofire.request("https://randomuser.me/api/?results=20&inc=name,picture,nat,cell,email,id")
        result.responseJSON { res in
            let jsonData = res.result.value! as! NSDictionary
            let results = jsonData["results"] as! NSArray
            
            for case let result as NSDictionary in results {
                let name_info = result["name"] as! NSDictionary
                let person: PersonInfo = PersonInfo(
                    first_name: name_info["first"] as! String,
                    last_name: name_info["last"] as! String,
                    gender: name_info["title"] as! String,
                    email: result["email"] as! String,
                    phone: result["cell"] as! String,
                    location: result["nat"] as! String
                )
                self.myFriendsInfo.append(person)
            }
        }
    }
    
    @objc func populate() {
        self.getFriendsList()
        refresher.endRefreshing()
        tableView.reloadData()
    }
    
    // table view reload!!
    @IBAction func reloadFriendList(_ sender: Any) {
        self.addRefreshHeader()
        self.getFriendsList()
        self.removeRefreshHeader()
        DispatchQueue.main.async {
            self.tableView.reloadData()
        }
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        let newView = segue.destination as! DetailViewController
        newView.nameVal = "test"
    }

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        let rowCount: Int = self.myFriendsInfo.count
        return rowCount
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "myfriendsCell", for: indexPath)
        
        let person = self.myFriendsInfo[indexPath.row]
        cell.textLabel!.text = person.first_name + " " + person.last_name
        cell.detailTextLabel!.text = person.email
        
        return cell
    }
}