Question

从webservice解码JSON响应时，我收到错误消息：

Could not cast value of type '__NSArrayM' (0x34df0900) to 'NSDictionary'

我在StackOverflow中尝试了很多解决方案，但没有任何效果。

我的代码：

let jsonData:NSDictionary = (NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers , error: &error) as? NSDictionary)!

let success:NSInteger = jsonData.valueForKey("success") as! NSInteger

来自网络服务的回复：

[
    {
        "id": "1",
        "title": "bmw",
        "price": "500.00",
        "description": "330",
        "addedDate": "2015-05-18 00:00:00",
        "user_id": "1",
        "user_name": "CANOVAS",
        "user_zipCode": "32767",
        "category_id": "1",
        "category_label": "VEHICULES",
        "subcategory_id": "2",
        "subcategory_label": "Motos",
        "bdd": {}
    }
]

感谢您的帮助

Answer 1

尝试更换以下行：

let jsonData:NSDictionary = (NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers , error: &error) as? NSDictionary)!

以下：

let jsonData:NSArray = (NSJSONSerialization.JSONObjectWithData(urlData!, options:NSJSONReadingOptions.MutableContainers , error: &error) as? NSArray)!

我希望这会对你有所帮助！

干杯！

Answer 2

使用SwiftyJSON：https://github.com/SwiftyJSON/SwiftyJSON

let json = JSON(data: urlData!)

如果成功在数组中

if let success = json[0]["success"].int {
     //Now you got your value
}

或者如果成功不在数组中

if let success = json["success"].int {
     //Now you got your value
}

您还可以检查成功值

if let success = json["success"].int where success == 1 {
     // Now you can do stuff
}

Answer 3

如果您错过了读取日志的“级别”，则会发生这种情况。我遇到了这个错误，尝试在这里转换为NSArray而不是NSMutableDictionary Swift JSON error, Could not cast value of type '__NSArrayM' (0x507b58) to 'NSDictionary' (0x507d74)

对象的实际内容位于该数组的索引0处的NSDictionary内。尝试使用此代码（包括一些日志行来说明）

        let dataDict = NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers, error: &error)

        println(dataDict)

        let contents = dataDict!.objectForKey("rows") as! NSMutableArray

        println(contents)

        println( "contents is = \(_stdlib_getDemangledTypeName(contents))")

        let innerContents = contents[0]

        println(innerContents)

        println( "inner contents is = \(_stdlib_getDemangledTypeName(innerContents))")

        let yourKey = innerContents.objectForKey("yourKey") as? String
        println(yourKey)

无法投射类型＆＃39; __ NSArrayM＆＃39; （0x34df0900）到＆＃39; NSDictionary＆＃39;迅速

3 个答案: