首页 文章

我无法使用swift提取NSDictionary值

提问于
浏览 次
0

从json数据对象解析后，我很难从NSDictionary对象中提取值 . ！[在此处输入图像说明] [1]

var stationsInfo: NSArray = stationsDictionary["stations"]! as NSArray
            for aStation in stationsInfo{
                //parse the information
                var station = aStation as NSDictionary
                println("next")
                var example: NSDictionary = ["key": "val", "key2": "val2", "key3": "val3"]
                var ex: String = example["key2"] as String
                println(station)
                var age_in_days : Double         = station["age_in_days"] as Double
                var hight_normal: Double         = station["height_nom"]  as Double
                var hight_over  : Double         = station["height_ovr"]  as Double
                var latitude: CLLocationDegrees  = station["lat"]         as Double
                var longitude: CLLocationDegrees = station["lon"]         as Double
                var station_id  : Int            = station["station_id"]  as Int

var ex最终等于“val2”，因为它可以工作，但是当我试图获取存储在站字典中的值时，我一直遇到奇怪的错误 .

尽管站的值如下，但仍会发生这种情况

{“age_in_days”= 1401753600; “height_nom”=“13.5”; “height_ovr”=“14.0”; lat =“24.084082”; lon =“89.023476”; “station_id”= 1; }

json swift nsdictionary

2 回答

  • 0

    您可以尝试将其作为Swift词典进行投射 . 你知道关键和 Value 是什么吗？如果是这样，请将AnyObjects替换为这些类型 . 你可以试试任何AnyObject，但你可能因此而必须做其他的转换 .

    var station = aStation as [AnyObject:AnyObject]
    回复于
  • 0

    我发现了什么问题！

    显然，默认情况下，所有JSON值都是string类型 .

    {“age_in_days”= 1401753600; “height_nom”=“13.5”; “height_ovr”=“14.0”; lat =“24.084082”; lon =“89.023476”; “station_id”= 1; }

    因此，获取double值的正确方法是：

    var dataDictionary  = NSJSONSerialization.JSONObjectWithData(dataInput, options: NSJSONReadingOptions.MutableContainers, error: &error) as? NSDictionary

var stationsInfo: NSArray = stationsDictionary["stations"]! as NSArray
for station in stationsInfo{
//parse the information
var age_in_days : Int            = (station["age_in_days"] as     String).toInt()!
var hight_normal: Double         = (station["height_nom"] as     NSString).doubleValue
var hight_over  : Double         = (station["height_ovr"] as     NSString).doubleValue
var latitude: CLLocationDegrees  = (station["lat"]        as     NSString).doubleValue
var longitude: CLLocationDegrees = (station["lon"]        as     NSString).doubleValue
var station_id  : Int            = (station["station_id"] as     String).toInt()!

    注意：类型String不包含.toDouble（）函数，这就是我不得不使用类型NSString的原因 .

    此外，非常重要注意：两个键“age_in_days”和“station_id”在JSON中显示为int类型（如上面的引用中所示），但NSJSONSerialization函数从String类型中获取所有值！

    回复于

相关问题