Question

亲爱的stackoverflow社区，

我有以下用swift编写的函数：

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);

}

产生以下输出：

(
        {
        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;
    }
)

然后我想用这些信息填充UITableView。我有以下两个功能来实现这个目标：

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，输出窗口显示：

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

它突出显示＆＃34; var homeTeamName：NSString = arrDict [indexPath.row] .valueForKey（＆＃34; home_team＆＃34;）as NSString＆＃34;绿色和州＆＃34; EXC_BAD_INSTRUCTION＆＃34;。

我确信我正在尝试错误地访问数组，但我不确定正确的方法。任何有关这方面的帮助将不胜感激。

非常感谢，ALAN。

Answer 1

查看您的数据：“home_team”和“away_team”是来自2级词典的值，位于1级词典的“fields”键中。

但您尝试直接在“arrDict”一级词典数组中访问“home_team”和“away_team”。

Array =＆gt;字典=＆gt;每个dic =＆gt;的字段键你的数据（在字典中）

所以你应该首先访问“字段”：

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

然后访问团队：

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

使用Swift从JSON数组填充UITableView

1 个答案: