Update TableView from Asynchronous Data in Swift - ios

Question

I'm currently working on an iOS Application and I recently came across the issue that I was downloading and parsing data synchronously and as a result making the app completely unresponsive.
I've updated my code to download my data and parse it asynchronously however I'm now hitting another issue.
I've been trying to split my code up and follow the MVC pattern. I have my TableViewController as the delegate and DataSource of the TableView. I have another class that is managing downloading+parsing my data.
My issue is, once the data is parsed - how do I update the TableView since it's all being done asynchronously.
TableViewController
func searchBarSearchButtonClicked(searchBar: UISearchBar) {
println(searchBar.text)
searchBar.resignFirstResponder() //Hide the keyboard
let result = ShowsDataParser.newSearchShows(searchBar.text) //Get search result based on input
searchResults = result.results
maxPages = result.maxPages
currentPage = 1
self.tableView.reloadData()
}
I've implemented all required methods(e.g cellForRowAtIndexPath) within this class too.
ShowsDataParser
class func newSearchShows(input: String, page:Int = 1) -> (results:[Show], maxPages: Int)
{
let searchUrl = "/search/tv" //Search URL
var searchResults = [Show]()
var totalPages = 1
let posterSize = "w92"
if let escapedSearch = escapeString(input) {
var search = apiLocation + searchUrl + "?query=" + escapedSearch + "&api_key=" + APIKey + "&page=\(page)"
if let url = NSURL(string: search)
{
let task = NSURLSession.sharedSession().dataTaskWithURL(url, completionHandler:{data,response,error -> Void in
if let json = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as? NSDictionary
{
var name: String
var id: Int
var status: String
var overview = "meow"
if let results = json["results"] as? NSArray
{
for result in results
{
id = result["id"] as! Int
name = result["original_name"] as! String
//overview = result["overview"] as! String
status = ""
var newShow = Show(showId: id, showName: name, showDesc: overview, showStatus: status)
if let date = result["first_air_date"] as? String
{
newShow.firstAired = self.formatDate(date)
}
if let poster = result["poster_path"] as? String
{
if let baseUrl = AppDelegate.config?.baseUrl
{
if let data = NSData(contentsOfURL: NSURL(string: baseUrl + posterSize + poster)!)
{
//newShow.posterImage = UIImage(data: data)
}
}
}
searchResults.append(newShow)
}
}
if let pages = json["total_pages"] as? Int
{
totalPages = pages
}
}
})
}
}
return (results: searchResults, maxPages: totalPages)
}
As you can see, the above class gets and parses the data from the specified url. I'm simply unsure of how to update the tableview after this is done. Calling upon self.tableView.reloadData() within searchBarSearchButtonClicked isn't working.

Answer 1

place the reloadData() call after the if statement
if let json = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as? NSDictionary
{
.... more code
if let pages = json["total_pages"] as? Int
{
totalPages = pages
}
}
self.myTableView.reloadData()