IOS 9 TableViewCell Not Visible Until Selected - uitableview

Question

I use a service in a background thread to fetch a post request. Then I use NSJSONSerialization to turn that into an array. I loop thorough the array to create an array of teams. Then i go back to the main queue and call the completion handler.
Team:
class Team
{
private (set) var id: Int
private (set) var city: String
private (set) var name: String
private (set) var abbreviation: String
init(data: JSONDictionary)
{
id = data["team_id"] as? Int ?? 0
city = data["city"] as? String ?? ""
name = data["team_name"] as? String ?? ""
abbreviation = data["abbreviation"] as? String ?? ""
}
}
Service:
func getTeams(urlString: String, completion: [Team] -> Void)
{
let config = NSURLSessionConfiguration.ephemeralSessionConfiguration()
let session = NSURLSession(configuration: config)
let url = NSURL(string: urlString)!
let request = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
let task = session.dataTaskWithRequest(request) {
(data, response, error) in
if error != nil {
print(error!.localizedDescription)
} else {
print(data)
do {
if let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .AllowFragments) as? JSONArray {
var teams = [Team]()
for team in json {
let team = Team(data: team as! JSONDictionary)
teams.append(team)
}
let priority = DISPATCH_QUEUE_PRIORITY_HIGH
dispatch_async(dispatch_get_global_queue(priority, 0)) {
dispatch_async(dispatch_get_main_queue()) {
completion(teams)
}
}
}
} catch {
print("error in NSJSONSerialization")
}
}
}
task.resume()
}
I then try to use data to populate a tableView. I also loop through and print out all the team names to the console with success. The problem I am having It populate the tableView but everything is all white. I cant see any txt from my labels until I touch it. While the table cell is selected I can see the contents of the labels which are in black. But if i touch another one only the currently selected label is showing. It seems they should all just show up visible once the data is loaded.
custom cell:
class TeamTableViewCell: UITableViewCell {
var team: Team? {
didSet {
updateCell()
}
}
#IBOutlet weak var title: UILabel!
#IBOutlet weak var abbreviation: UILabel!
func updateCell()
{
title.text = team?.name ?? ""
abbreviation.text = team?.abbreviation ?? ""
}
}
Controller:
var teams = [Team]()
override func viewDidLoad() {
super.viewDidLoad()
title = "Teams"
let service = NBAService()
service.getTeams("https://probasketballapi.com/teams?api_key=\(Constants.API.APIKey)", completion: didLoadTeams )
}
func didLoadTeams(teams: [Team])
{
self.teams = teams
tableView.reloadData()
// This actuall works returns an list of team names to the console.
for team in teams {
print("Team: \(team.name)")
}
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(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
return teams.count
}
struct Storyboard {
static let TeamCell = "TeamCell"
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(Storyboard.TeamCell, forIndexPath: indexPath) as! TeamTableViewCell
// Configure the cell...
cell.team = self.teams[indexPath.row]
return cell
}
When i print the teams names to the console that prints fine so I know that I have successfully got the data back from the request. And one team at a time is visible when the cell is selected. What am I missing

Answer 1

This is kind of strange:
dispatch_async(dispatch_get_global_queue(priority, 0)) {
dispatch_async(dispatch_get_main_queue()) {
completion(teams)
}
}
I would replace this with:
dispatch_async(dispatch_get_main_queue()) {
completion(teams)
}