使用Swift從JSON數組填充UITableView

Question

尊敬的stackoverflow社區，

我迅速編寫了以下函數：

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);

}

產生以下輸出：

(
        {
        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;
    }
)

然后，我想用此信息填充UITableView。 我具有以下兩個功能來實現此目的：

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

}

但是，輸出窗口顯示：

fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb) 

它以綠色突出顯示“ var homeTeamName：NSString = arrDict [indexPath.row] .valueForKey（“ home_team”）as NSString”，並注明“ EXC_BAD_INSTRUCTION”。

我確信我試圖錯誤地訪問該陣列，但是我不確定前進的正確方法。 任何幫助，將不勝感激。

非常感謝，ALAN。

Answer 1

查看您的數據：“ home_team”和“ away_team”是來自2級字典的值，位於1級字典的“字段”鍵中。

但是，您嘗試直接在1級詞典的 “ arrDict” 數組中訪問“ home_team”和“ away_team”。

數組=>詞典=>每個dic的字段鍵=>您的數據（在詞典中）

因此，您應該首先訪問“字段”：

let fields = arrDict[indexPath.row].valueForKey("fields") as NSDictionary

然后訪問團隊：

let homeTeamName = fields.valueForKey("home_team") as NSString