I've got JSON filling my UITableView successfully, but the JSON is often updated so I need the ability to refresh. I followed THIS TUTORIAL to implement a pull to refresh control. Visually, it seems like it all works correctly, but when I call tableView.reloadData() the table doesn't reload. However, if I leave the ViewController and return, the table is updated. Why would tableView.reloadData() work in viewDidAppear and viewWillAppear but not in my custom refresh() function?
MainVC.swift file
class MainVC: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet var tableView: UITableView!
var dataArray: NSArray = NSArray()
@IBOutlet var Controller: UISegmentedControl!
var refreshControl:UIRefreshControl!
func refresh(sender:AnyObject)
{
refreshBegin("Refresh",
refreshEnd: {(x:Int) -> () in
self.tableView .reloadData()
println("Table Reloaded")
self.refreshControl.endRefreshing()
})
}
func refreshBegin(newtext:String, refreshEnd:(Int) -> ()) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
println("refreshing")
sleep(2)
dispatch_async(dispatch_get_main_queue()) {
refreshEnd(0)
}
}
}
override func viewWillAppear(animated: Bool) {
self.tableView .reloadData()
}
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.titleView = UIImageView(image: UIImage(named: "logojpg.jpg"))
startConnectionAt("http://www.domain.com/json.php")
refreshControl = UIRefreshControl()
refreshControl.backgroundColor = UIColor.orangeColor()
refreshControl.tintColor = UIColor.whiteColor()
refreshControl.attributedTitle = NSAttributedString(string: "Pull to Refresh")
refreshControl.addTarget(self, action: "refresh:", forControlEvents: UIControlEvents.ValueChanged)
tableView.addSubview(refreshControl)
}
//MARK: JSON Loading
var data: NSMutableData = NSMutableData()
func startConnectionAt(urlPath: String){
var url: NSURL = NSURL(string: urlPath)
var request: NSURLRequest = NSURLRequest(URL: url)
var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)
connection.start()
}
func connection(connection: NSURLConnection!, didFailWithError error: NSError!) {
println("Connection failed.\(error.localizedDescription)")
}
func connection(connection: NSURLConnection, didRecieveResponse response: NSURLResponse) {
println("Recieved response")
}
func connection(didReceiveResponse: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
self.data = NSMutableData()
}
func connection(connection: NSURLConnection!, didReceiveData data: NSData!) {
self.data.appendData(data)
}
func connectionDidFinishLoading(connection: NSURLConnection!) {
var dataAsString: NSString = NSString(data: self.data, encoding: NSUTF8StringEncoding)
var err: NSError
var json: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
var results: NSArray = json["needs"] as NSArray
self.dataArray = results
tableView.reloadData()
println("success")
}
//End loading of JSON
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {
return self.dataArray.count;
}
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
var cell:CustomCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as CustomCell
var rowData: NSDictionary = dataArray[indexPath.row] as NSDictionary
var firstName=rowData["needFirstname"] as String
var descrip=rowData["needDescription"] as String
var poster=rowData["needPoster"] as String
var city=rowData["needCity"] as String
var state=rowData["needState"] as String
var country=rowData["needCountry"] as String
cell.needFirstName.text = firstName
cell.needDescription.text = descrip
cell.needDescription.numberOfLines = 0
cell.needPoster.text = poster
cell.needCity.text = city
cell.needState.text = state
cell.needCountry.text = country
return cell
}
@IBAction func Change(sender: AnyObject) {
if Controller.selectedSegmentIndex == 0 {
startConnectionAt("http://www.domain.com/localJSON.php")
}
else if Controller.selectedSegmentIndex == 1 {
startConnectionAt("http://www.domain.com/intlJSON.php")
}
self.tableView .reloadData()
}
}
