在swift中创建JSON

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我需要像这样创建JSON:
Order = {   type_id:'1',model_id:'1',transfer:{
     startDate:'10/04/2015 12:45',endDate:'10/04/2015 16:00',startPoint:'Ул. Момышулы,45',endPoint:'Аэропорт Астаны'
   },hourly:{
     startDate:'10/04/2015',endDate:'11/04/2015',startPoint:'ЖД Вокзал',endPoint:'',undefined_time:'1'
   },custom:{
     startDate:'12/04/2015',endDate:'12/04/2015',startPoint:'Астана',endPoint:'Павлодар',customPrice:'50 000'
   },commentText:'',device_type:'ios'
};

问题是我无法创建有效的JSON。
这是我如何创建对象:

let jsonObject: [AnyObject]  = [
        ["type_id": singleStructDataOfCar.typeID,"model_id": singleStructDataOfCar.modelID,"transfer": savedDataTransfer,"hourly": savedDataHourly,"custom": savedDataReis,"device_type":"ios"]
    ]

其中savedData是字典:

let savedData: NSDictionary = ["ServiceDataStartDate": singleStructdata.startofWork,"ServiceDataAddressOfReq": singleStructdata.addressOfRequest,"ServiceDataAddressOfDel": singleStructdata.addressOfDelivery,"ServiceDataDetailedText": singleStructdata.detailedText,"ServiceDataPrice": singleStructdata.priceProposed]

当我仅使用创建我的JSON对象的字符串时,一切正常。但是当我包含字典NSJSONSerialization.isValidJSONObject(value)返回false。如何创建有效的字典?

一个问题是这个代码不是类型字典。
let jsonObject: [AnyObject]  = [
    [
         "type_id": singleStructDataOfCar.typeID,"device_type":"iOS"
    ]
]

以上是一个AnyObject的数组,其中包含一个类型为[String:AnyObject]的字典。

尝试这样的方式来匹配上面提供的JSON:

let savedData = ["Something": 1]

let jsonObject: [String: AnyObject] = [
    "type_id": 1,"model_id": 1,"transfer": [
        "startDate": "10/04/2015 12:45","endDate": "10/04/2015 16:00"
    ],"custom": savedData
]

let valid = NSJSONSerialization.isValidJSONObject(jsonObject) // true

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