Question

我从一个json数据对象解析后，很难从NSDictionary对象中提取值。！[在此输入图像说明] [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＆＃34; val2＆＃34;因为它可以工作，但当我试图获取存储在电台词典中的值时，我会一直遇到奇怪的错误。

尽管电台的价值如下，但仍然会发生这种情况

{ ＆＃34; age_in_days＆＃34; = 1401753600; ＆＃34; height_nom＆＃34; =＆＃34; 13.5＆＃34 ;; ＆＃34; height_ovr＆＃34; =＆＃34; 14.0＆＃34 ;; lat =＆＃34; 24.084082＆＃34 ;; lon =＆＃34; 89.023476＆＃34 ;; ＆＃34; station_id＆＃34; = 1; }

Answer 1

您可以尝试将其转换为Swift词典。你知道关键和价值是什么吗？如果是这样，请将AnyObjects替换为这些类型。你可以试试任何AnyObject，但你可能不得不做其他的转换。

var station = aStation as [AnyObject:AnyObject]

Answer 2

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。

另外，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！

我无法使用swift提取NSDictionary值

2 个答案: