Populate UITableView from JSON Array using Swift - json

Question

Dear stackoverflow community,
I have the following function written in swift:
func jsonParsing()
{
let url2 = NSURL(string: "http://localhost:8000/straightred/jsonfixture")
let data = NSData(contentsOfURL: url2!)
var arr = NSJSONSerialization.JSONObjectWithData(data!, options: nil, error: nil) as NSArray
for var i = 0 ; i < (arr as NSArray).count ; i++
{
arrDict.addObject((arr as NSArray) .objectAtIndex(i))
}
println(arrDict);
}
Which produces the following output:
(
{
fields = {
"away_team" = Burnley;
awayteamscore = 2;
fixturedate = "2014-11-22T15:00:00";
fixturematchday = 12;
fixturestatus = FINISHED;
"home_team" = Stoke;
hometeamscore = 1;
soccerseason = 354;
};
model = "straightred.straightredfixture";
pk = 136932;
},
{
fields = {
"away_team" = Swans;
awayteamscore = 1;
fixturedate = "2014-11-22T15:00:00";
fixturematchday = 12;
fixturestatus = FINISHED;
"home_team" = ManCity;
hometeamscore = 2;
soccerseason = 354;
};
model = "straightred.straightredfixture";
pk = 136930;
},
{
fields = {
"away_team" = Sunderland;
awayteamscore = 0;
fixturedate = "2014-11-22T15:00:00";
fixturematchday = 12;
fixturestatus = FINISHED;
"home_team" = Foxes;
hometeamscore = 0;
soccerseason = 354;
};
model = "straightred.straightredfixture";
pk = 137852;
},
{
fields = {
"away_team" = "West Ham";
awayteamscore = 1;
fixturedate = "2014-11-22T15:00:00";
fixturematchday = 12;
fixturestatus = FINISHED;
"home_team" = Everton;
hometeamscore = 2;
soccerseason = 354;
};
model = "straightred.straightredfixture";
pk = 136929;
},
{
fields = {
"away_team" = "West Bromwich";
awayteamscore = 0;
fixturedate = "2014-11-22T15:00:00";
fixturematchday = 12;
fixturestatus = FINISHED;
"home_team" = Chelsea;
hometeamscore = 2;
soccerseason = 354;
};
model = "straightred.straightredfixture";
pk = 136928;
},
{
fields = {
"away_team" = QPR;
awayteamscore = 0;
fixturedate = "2014-11-22T15:00:00";
fixturematchday = 12;
fixturestatus = FINISHED;
"home_team" = Newcastle;
hometeamscore = 1;
soccerseason = 354;
};
model = "straightred.straightredfixture";
pk = 136931;
},
{
fields = {
"away_team" = ManU;
awayteamscore = 2;
fixturedate = "2014-11-22T17:30:00";
fixturematchday = 12;
fixturestatus = FINISHED;
"home_team" = Arsenal;
hometeamscore = 1;
soccerseason = 354;
};
model = "straightred.straightredfixture";
pk = 136927;
},
{
fields = {
"away_team" = Liverpool;
awayteamscore = 1;
fixturedate = "2014-11-23T13:30:00";
fixturematchday = 12;
fixturestatus = FINISHED;
"home_team" = Crystal;
hometeamscore = 3;
soccerseason = 354;
};
model = "straightred.straightredfixture";
pk = 136926;
},
{
fields = {
"away_team" = Spurs;
awayteamscore = 2;
fixturedate = "2014-11-23T16:00:00";
fixturematchday = 12;
fixturestatus = FINISHED;
"home_team" = Hull;
hometeamscore = 1;
soccerseason = 354;
};
model = "straightred.straightredfixture";
pk = 136925;
},
{
fields = {
"away_team" = Southampton;
awayteamscore = 1;
fixturedate = "2014-11-24T20:00:00";
fixturematchday = 12;
fixturestatus = FINISHED;
"home_team" = "Aston Villa";
hometeamscore = 1;
soccerseason = 354;
};
model = "straightred.straightredfixture";
pk = 136924;
}
)
I then want to populate a UITableView with this information. I have the following two functions to achieve this:
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return arrDict.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:TblCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as TblCell
var homeTeamName : NSString=arrDict[indexPath.row] .valueForKey("home_team") as NSString
var awayTeamName : NSString=arrDict[indexPath.row] .valueForKey("away_team") as NSString
cell.lblHomeTeam.text = homeTeamName
cell.lblAwayTeam.text = awayTeamName
return cell
}
However, the output window shows:
fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
It highlights the "var homeTeamName : NSString=arrDict[indexPath.row] .valueForKey("home_team") as NSString" in green and states "EXC_BAD_INSTRUCTION".
I am convinced that I am trying to access the array incorrectly but I am not sure the correct way forward. Any help on this would be appreciated.
Many thanks, ALAN.

Answer 1

Look at your data: "home_team" and "away_team" are values from a level 2 dictionary, in the "fields" key of a level 1 dictionary.
But you try to access "home_team" and "away_team" directly inside your "arrDict" array of level 1 dictionaries.
Array => Dictionaries => Fields key of each dic => your data (in a dictionary)
So you should first access "fields":
let fields = arrDict[indexPath.row].valueForKey("fields") as NSDictionary
Then access the team:
let homeTeamName = fields.valueForKey("home_team") as NSString