SwiftDeveloper SwiftDeveloper - 1 year ago 300
iOS Question

Swift tableView Pagination

I have success working tableview with json parsing codes.But may have 1000 more item so need pagination when scrolling bottom side. I dont know how can i do this my codes under below. For objective-c have a lot of example but for swift i didnt find working example. Im waiting your helps. I think will be help too many people. Thank you !

import UIKit

class ViewController: UIViewController, UITableViewDataSource,UITableViewDelegate {

let kSuccessTitle = "Congratulations"
let kErrorTitle = "Connection error"
let kNoticeTitle = "Notice"
let kWarningTitle = "Warning"
let kInfoTitle = "Info"
let kSubtitle = "You've just displayed this awesome Pop Up View"

@IBOutlet weak var myTableView: UITableView!
@IBOutlet weak var myActivityIndicator: UIActivityIndicatorView!

var privateList = [String]()

override func viewDidLoad() {
// Do any additional setup after loading the view, typically from a nib.


override func viewWillAppear(animated: Bool) {



override func didReceiveMemoryWarning() {
// Dispose of any resources that can be recreated.

internal func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
return privateList.count

internal func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell

let cell:myCell = tableView.dequeueReusableCellWithIdentifier("myCell") as! myCell

cell.titleLabel.text = privateList[indexPath.row]

return cell

func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {

if (editingStyle == UITableViewCellEditingStyle.Delete){


let alert = SCLAlertView()
alert.addButton("Hayır"){ }
alert.addButton("Evet") {


tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Left)



alert.showSuccess(kSuccessTitle, subTitle: kSubtitle)



func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// the cells you would like the actions to appear needs to be editable
return true

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

if(segue.identifier == "Detail") {

let destinationView = segue.destinationViewController as! DetailViewController

if let indexPath = myTableView.indexPathForCell(sender as! UITableViewCell) {

destinationView.privateLista = privateList[indexPath.row]


internal func tableView(tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat
return 0.0

func loadItems()


func loadItemsNow(listType:String){
let listUrlString = "http://bla.com/json2.php?listType=" + listType + "&t=" + NSUUID().UUIDString
let myUrl = NSURL(string: listUrlString);
let request = NSMutableURLRequest(URL:myUrl!);
request.HTTPMethod = "GET";

let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
data, response, error in

if error != nil {


do {

let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSArray

if let parseJSON = json {

self.privateList = parseJSON as! [String]


} catch {






Answer Source

For that you need to have server side change also.

  1. Server will accept fromIndex and batchSize in the API url as query param.

    let listUrlString =  "http://bla.com/json2.php?listType=" + listType + "&t=" + NSUUID().UUIDString + "&batchSize=" + batchSize + "&fromIndex=" + fromIndex
  2. In the server response, there will be an extra key totalItems. This will be used to identify all items are received or not. An array or items fromIndex to batchSize number of items.

In the app side

  1. First loadItem() will be called with fromIndex = 0 and batchSize = 20 (for example in viewDidLoad() or viewWillAppear). removeAll items from privateList array before calling loadItem() for the first time

  2. Server returns an array of first 20 items and totalItems total number of items in the server.

  3. Append the 20 items in privateList array and reload tableView

  4. In tableView:cellForRowAtIndexPath method check if the cell is the last cell. And check if totalItems (form server) is greater than privateList.count. That means there are more items in the server to load

    if indexPath.row == privateList.count - 1 { // last cell
        if totalItems > privateList.count { // more items to fetch
            loadItem() // increment `fromIndex` by 20 before server call

Question: where is refresh ? will be scrolling ?

Refresh after appending new items in the array when server response received. (step 3)

Scrolling will trigger tableView:cellForRowAtIndexPath for every cell when user scrolls. Code is checking if it is the last cell and fetch remaining items. (step 4)

Sample project added:

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