Pull to Refresh on tableView - ios

Question

I want to pull to refresh for my RSS feed news app. I using navigation controller and table view controller. How should I do on Table View Controller? What should we add? My code is here.
class TableviewController: UITableViewController {
var items : Array<Item> = []
var entries : Array<Entry> = []
override func viewDidLoad() {
super.viewDidLoad()
loadRSS()
loadAtom()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return items.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ItemCell", for: indexPath)
let item:Item = self.items[indexPath.row]
cell.textLabel?.text = item.title
cell.detailTextLabel?.text = self.pubDateStringFromDate(item.pubDate! as Date)
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let item = self.items[indexPath.row]
let url:URL = URL(string: item.link!)!
let safariViewController = SFSafariViewController(url: url, entersReaderIfAvailable: true)
present(safariViewController, animated: true, completion: nil)
}
func loadRSS() {
let feedUrlString:String = "websiteurl"
Alamofire.request(feedUrlString).response { response in
if let data = response.data, let _ = String(data: data, encoding: .utf8) {
TIFeedParser.parseRSS(xmlData: data as NSData, completionHandler: {(isSuccess, channel, error) -> Void in
if (isSuccess) {
self.items = channel!.items!
self.tableView.reloadData()
}
if (response.error != nil) {
print((response.error?.localizedDescription)! as String)
}
})
}
}
}
func loadAtom() {
let feedUrlString:String = "websiteurl"
Alamofire.request(feedUrlString).response { response in
if let data = response.data, let _ = String(data: data, encoding: .utf8) {
TIFeedParser.parseAtom(xmlData: data as NSData, completionHandler: {(isSuccess, feed, error) -> Void in
if (isSuccess) {
self.entries = feed!.entries!
self.tableView.reloadData()
}
if (error != nil) {
print((error?.localizedDescription)! as String)
}
})
}
}
}
func pubDateStringFromDate(_ pubDate:Date)->String {
let format = DateFormatter()
format.dateFormat = "yyyy/M/d HH:mm"
let pubDateString = format.string(from: pubDate)
return pubDateString
}
}

Answer 1

1) Declare an property of type UIRefreshControl as:
var refreshControl = UIRefreshControl()
2) In viewDidLoad()method add this refreshControl to your table view as:
self.refreshControl.addTarget(self, action: #selector(loadRSS), for: .valueChanged)
if #available(iOS 10, *){
self.tableView.refreshControl = self.refreshControl
}else{
self.tableView.addSubview(self.refreshControl)
}

Answer 2

Declare a property refreshControl in your TableViewController as
var refreshControl:UIRefreshControl?
The in viewDidLoad() function add the following code
refreshControl?.addTarget(self, action: #selector(loadRSS), for: .valueChanged)
self.tableView.addSubview(refreshControl!)
Update your loadRSS() function as
func loadRSS() {
let feedUrlString:String = "websiteurl"
Alamofire.request(feedUrlString).response { response in
self.refreshControl?.endRefreshing(
if let data = response.data, let _ = String(data: data, encoding: .utf8) {
TIFeedParser.parseRSS(xmlData: data as NSData, completionHandler: {(isSuccess, channel, error) -> Void in
if (isSuccess) {
self.items = channel!.items!
self.tableView.reloadData()
}
if (response.error != nil) {
print((response.error?.localizedDescription)! as String)
}
})
}
}
}

Answer 3

Please refer following code , as i have added pull to refresh control on your code.
class TableviewController: UITableViewController {
var items : Array<Item> = []
var entries : Array<Entry> = []
var pullToFrefreshNews:UIRefreshControl!
override func viewDidLoad() {
super.viewDidLoad()
loadRSS()
loadAtom()
self.addPulltoRefrehs()
}
func addPulltoRefrehs() {
self.pullToFrefreshNews = UIRefreshControl()
self.pullToFrefreshNews.addTarget(self, action: #selector(TableviewController.loadRSS), for: UIControlEvents.valueChanged)
self.newsTableVU.addSubview(pullToFrefreshNews)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return items.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ItemCell", for: indexPath)
let item:Item = self.items[indexPath.row]
cell.textLabel?.text = item.title
cell.detailTextLabel?.text = self.pubDateStringFromDate(item.pubDate! as Date)
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let item = self.items[indexPath.row]
let url:URL = URL(string: item.link!)!
let safariViewController = SFSafariViewController(url: url, entersReaderIfAvailable: true)
present(safariViewController, animated: true, completion: nil)
}
func loadRSS() {
let feedUrlString:String = "websiteurl"
Alamofire.request(feedUrlString).response { response in
if let data = response.data, let _ = String(data: data, encoding: .utf8) {
TIFeedParser.parseRSS(xmlData: data as NSData, completionHandler: {(isSuccess, channel, error) -> Void in
if (isSuccess) {
self.items = channel!.items!
self.tableView.reloadData()
}
if (response.error != nil) {
print((response.error?.localizedDescription)! as String)
}
})
}
}
}
func loadAtom() {
let feedUrlString:String = "websiteurl"
Alamofire.request(feedUrlString).response { response in
if let data = response.data, let _ = String(data: data, encoding: .utf8) {
TIFeedParser.parseAtom(xmlData: data as NSData, completionHandler: {(isSuccess, feed, error) -> Void in
if (isSuccess) {
self.entries = feed!.entries!
self.tableView.reloadData()
}
if (error != nil) {
print((error?.localizedDescription)! as String)
}
})
}
}
}
func pubDateStringFromDate(_ pubDate:Date)->String {
let format = DateFormatter()
format.dateFormat = "yyyy/M/d HH:mm"
let pubDateString = format.string(from: pubDate)
return pubDateString
}
}