如何使用SwiftyJSON嵌套的JSON值 [英] How to use SwiftyJSON on nested JSON values

问题描述

我打电话一个JSON API，它有我需要得到多个嵌套值。我使用SwiftyJSON做事情有点清洁。对于顶层的价值观，一切似乎都做工精细，但更深层次的东西，我得到了可怕的展开可选值时零。

I'm calling a JSON API that has several nested values that I need to get. I'm using SwiftyJSON to make things a little cleaner. For the top level values, everything seems to be working fine, but on anything deeper, I'm getting the dreaded "nil when unwrapping optional value."

下面是我正在做与Alamofire API调用：

Here is how I'm making the API call with Alamofire:

Alamofire.request(APIRequests.Router.Nearby(self.page)).responseJSON(){
        (_,_,json,_) in
        println(json)
        if (json != nil){
            var jsonObj = JSON(json!)

            if let userArray = jsonObj ["results"].array {

                for userDict in userArray {
                        var username: String! = userDict["username"].string
                        var firstName: String! = userDict["firstName"].string
                        var profileImage: String! = userDict["userImages"]["profile"]["filename"].string
                        var characterName: String! = userDict["characters"]["characterName"].string

                        var user = User(username: username, profileImage: profileImage, firstName: firstName, characterName: characterName)

                        self.users.append(user)
                    }
                }

下面是JSON的示例：

Here is a sample of the JSON:

{
  userInfo: {
     something: "abc",
     requestType: "GET"
  },
  results: [
    {
     username: "Jess",
     firstName: "Jessica",
     userImages: {
        profile: [
           {
            userImageID: "6",
            filename: "user-07.jpg"
           }
        ],
        cover: [
           {
            userImageID: "15",
            filename: "user-07.jpg"
           }
        ]
     },
     characters: [
         {
          userCharacterID: "8",
          characterName: "Amelia",
         }
     ]
}

有关顶级键用户名和的firstName 调试器显示正确的价值观，但是，只要我下潜得更深一些，以获得 profileImage 或 characterName 这些都回来了作为零，即使打印的json显示了值这些密钥。

For the top level keys username and firstName the debugger is showing the correct values, however, as soon as I dive a little deeper to get profileImage or characterName these are coming back as nil even though printing the json shows values for those keys.

我是什么做错了吗？我只是没有看到它。

What am I doing wrong? I'm just not seeing it.

任何想法，将是有益的。谢谢你。

Any thoughts would be helpful. Thank you.

推荐答案

尝试

var profileImage: String! = userDict["userImages"]["profile"][0]["filename"].string

var characterName: String! = userDict["characters"][0]["characterName"].string

和让我们知道它给了。

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