Swift JSON错误：无法将types'__NSDictionaryM'的值转换为'NSArray'

从Web服务（API）解码JSON时，我得到错误：

Could not cast value of type '__NSDictionaryM' (0x1037ad8a8) to 'NSArray' (0x1037ad470). 

我的代码：

 var kGetURL = "http://bitnami.local/cscart_demo/api/users" //var kGetURL = "http://localhost/fendy/getjson.php" var json : Array<AnyObject> = [] override func viewDidLoad() { super.viewDidLoad() start() } func getData(data : NSData){ //error at this line : json = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as! Array<AnyObject> //error tableView.reloadData() } func start(){ var url : NSURL = NSURL(string: kGetURL)! var data : NSData = NSData(contentsOfURL: url)! getData(data) } 

如果我更改URL为http：//localhost/fendy/getjson.php ，它的工作如此之好。

我得到错误，如果我的url是http：//bitnami.local/cscart_demo/api/users

来自webservice的响应http：//localhost/fendy/getjson.php ：

  [{"id":"17","Name":"KFC","Message":"awesome"}, {"id":"18","Name":"McDonald","Message":"good"}, {"id":"23","Name":"Burger King","Message":"tasty"}, {"id":"38","Name":"Pizza hut","Message":"yummy"}, {"id":"39","Name":"Steak","Message":"very Delicious"}] 

来自webservice http：//bitnami.local/cscart_demo/api/users的回应 ：

  {"users": [{"user_id":"4","user_login":"user_4","is_root":"N","timestamp":"1441608048","user_type":"C","status":"A","firstname":"","lastname":"","email":"[e-mail]","company":"","company_id":"1","company_name":"Simtech"}, {"user_id":"3","user_login":"customer","is_root":"N","timestamp":"1441604240","user_type":"C","status":"A","firstname":"Customer","lastname":"Customer","email":"[e-mail]","company":"Simtech","company_id":"1","company_name":"Simtech"}, {"user_id":"1","user_login":"admin","is_root":"Y","timestamp":"1441604240","user_type":"A","status":"A","firstname":"John","lastname":"Doe","email":"[e-mail]","company":"Your company","company_id":"0","company_name":null}], "params":{"page":1,"items_per_page":"10","sort_order":"asc","sort_by":"name","sort_order_rev":"desc","total_items":"3"}} 

我认为这是风格是一样的，但为什么不与urlhttp：//bitnami.local/cscart_demo/api/users 。 任何人都可以帮忙

Answer 1

bitnami响应以{开始，因此它是一个JSON对象 ，它对应于一个NSDictionary 。 另一个以[表示数组开头。

您需要将json的types更改为Dictionary<String, AnyObject> ，并反序列化，如下所示：

 json = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as! Dictionary<String, AnyObject> 

Answer 2

你的方法是将JSON结果转换为数组。 它能正常工作，返回一个数组表示为JSON的数组，但是它不适用于返回字典的URL，而不是用JSON表示的数组。

尽pipe返回值的“风格”看起来相同，但第二个是单项词典。 你可能想要的是从它提取"users"元素，这是一个数组。

如果你不知道你得到的两个url中的哪一个，你可以尝试两种样式与as? 投而不是as! ：

 let tmp : AnyObject! = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) if let arr = tmp as? Array<AnyObject> { json = arr } else if dict = tmp as? [String: AnyObject] { json = dict["users"] as! Array<AnyObject> } else { // Handle an error: the input was unexpected } tableView.reloadData()