用swift创建嵌套对象数组的json对象

Question

我需要用一个嵌套的对象数组来解析json，我一直试图理解它的结构。

JSON结构如下

{ 
    "data":[ 
    { 
    "name":"NYSC", 
    "query":"NYSC", 
    "tweet_volume":18478, 
    "tweets_sata":[ 
     { 
      "tweet":"RT @badt_BOI_: For every graduate going for youth service this Nov, make sure u take the Skill Acquisition Program in NYSC camp seriously,\u2026", 
      "user":"STEEV" 
     }, 
     { 
      "tweet":"RT @phoonke: Take enough passports to camp. NYSC will collect passports like they want to use you for blood money. \ud83d\ude12", 
      "user":"EBI" 
     }, 
     { 
      "tweet":"RT @de_s0_la: Nysc year that I was preping my nursery 2 class for exams\nI asked them animal sounds.\nMe: A cat meows & a dog___?\nWhole class\u2026", 
      "user":"Miyaki" 
     }, 
     { 
      "tweet":"RT @Hisroyaldopenez: When You see your ex that NYSC posted to Borno https:\/\/t.co\/BDUWwSdW4Y", 
      "user":"Gbenga" 
     }, 
     { 
      "tweet":"RT @OjokutuDaniel: If you're are from Kogi State (Kabba), studied Civil Engr (must have finished NYSC) there's a scholarship and job offer\u2026", 
      "user":"Ad\u00e9r\u00f3j\u00fa" 
     }, 
     { 
      "tweet":"RT @ThisIsKennys: Osas that had already made plans about how she will go to Abuja & buy iPhone 7 within 2months because politicians... NYSC\u2026", 
      "user":"@i.wear.asika \u2702\ufe0f" 
     }, 
     { 
      "tweet":"RT @hakorayday: Some of y'all ladies are just getting posted for NYSC & y'all be talking about wanting a man earning 200k. U will be OK wen\u2026", 
      "user":"Jollof Rice" 
     }, 
     { 
      "tweet":"RT @de_s0_la: Nysc year that I was preping my nursery 2 class for exams\nI asked them animal sounds.\nMe: A cat meows & a dog___?\nWhole class\u2026", 
      "user":"Adebisi KingLY \ud83d\udc51" 
     }, 
     { 
      "tweet":"RT @SlimDandyMUFC: People talking about NYSC everywhere but I can't relate cos school dropout https:\/\/t.co\/b2Bn0lU11l", 
      "user":"@i.wear.asika \u2702\ufe0f" 
     }, 
     { 
      "tweet":"RT @Svdia_: Who are those coming to Birnin Kebbi for NYSC??! Contact me for accommodation. RT please", 
      "user":"Isah" 
     }, 
     { 
      "tweet":"RT @VhickThorKING: After doing dry fasting expecting Nysc to post u to either Lagos or Port Harcourt & you magically end up in the North\ud83d\ude02\ud83d\ude2d\ud83d\ude2d\u2026", 
      "user":"." 
     }, 
     { 
      "tweet":"Nysc be breaking people's hearts.\ud83d\ude05\ud83d\ude04\ud83d\ude02", 
      "user":"Password" 
     }, 
     { 
      "tweet":"RT @I_pissVodka: Wearing NYSC Kaki to church isn't a bad idea...all na Service", 
      "user":"Obie Drakes" 
     }, 
     { 
      "tweet":"RT @Beardrain: If you can have sex in nysc camps, you can have sex inside a dustbin", 
      "user":"Jollof Rice" 
     }, 
     { 
      "tweet":"RT @Ms_DHK: People after checking their NYSC: https:\/\/t.co\/7W8IiOCcNY", 
      "user":"." 
     } 
    ] 
    }, 
    { 
    "name":"NYSC", 
    "query":"NYSC", 
    "tweet_volume":18478, 
    "tweets_sata":[ 
     { 
      "tweet":"RT @badt_BOI_: For every graduate going for youth service this Nov, make sure u take the Skill Acquisition Program in NYSC camp seriously,\u2026", 
      "user":"STEEV" 
     }, 
     { 
      "tweet":"RT @phoonke: Take enough passports to camp. NYSC will collect passports like they want to use you for blood money. \ud83d\ude12", 
      "user":"EBI" 
     }, 
     { 
      "tweet":"RT @de_s0_la: Nysc year that I was preping my nursery 2 class for exams\nI asked them animal sounds.\nMe: A cat meows & a dog___?\nWhole class\u2026", 
      "user":"Miyaki" 
     }, 
     { 
      "tweet":"RT @Hisroyaldopenez: When You see your ex that NYSC posted to Borno https:\/\/t.co\/BDUWwSdW4Y", 
      "user":"Gbenga" 
     }, 
     { 
      "tweet":"RT @OjokutuDaniel: If you're are from Kogi State (Kabba), studied Civil Engr (must have finished NYSC) there's a scholarship and job offer\u2026", 
      "user":"Ad\u00e9r\u00f3j\u00fa" 
     }, 
     { 
      "tweet":"RT @ThisIsKennys: Osas that had already made plans about how she will go to Abuja & buy iPhone 7 within 2months because politicians... NYSC\u2026", 
      "user":"@i.wear.asika \u2702\ufe0f" 
     }, 
     { 
      "tweet":"RT @hakorayday: Some of y'all ladies are just getting posted for NYSC & y'all be talking about wanting a man earning 200k. U will be OK wen\u2026", 
      "user":"Jollof Rice" 
     }, 
     { 
      "tweet":"RT @de_s0_la: Nysc year that I was preping my nursery 2 class for exams\nI asked them animal sounds.\nMe: A cat meows & a dog___?\nWhole class\u2026", 
      "user":"Adebisi KingLY \ud83d\udc51" 
     }, 
     { 
      "tweet":"RT @SlimDandyMUFC: People talking about NYSC everywhere but I can't relate cos school dropout https:\/\/t.co\/b2Bn0lU11l", 
      "user":"@i.wear.asika \u2702\ufe0f" 
     }, 
     { 
      "tweet":"RT @Svdia_: Who are those coming to Birnin Kebbi for NYSC??! Contact me for accommodation. RT please", 
      "user":"Isah" 
     }, 
     { 
      "tweet":"RT @VhickThorKING: After doing dry fasting expecting Nysc to post u to either Lagos or Port Harcourt & you magically end up in the North\ud83d\ude02\ud83d\ude2d\ud83d\ude2d\u2026", 
      "user":"." 
     }, 
     { 
      "tweet":"Nysc be breaking people's hearts.\ud83d\ude05\ud83d\ude04\ud83d\ude02", 
      "user":"Password" 
     }, 
     { 
      "tweet":"RT @I_pissVodka: Wearing NYSC Kaki to church isn't a bad idea...all na Service", 
      "user":"Obie Drakes" 
     }, 
     { 
      "tweet":"RT @Beardrain: If you can have sex in nysc camps, you can have sex inside a dustbin", 
      "user":"Jollof Rice" 
     }, 
     { 
      "tweet":"RT @Ms_DHK: People after checking their NYSC: https:\/\/t.co\/7W8IiOCcNY", 
      "user":"." 
     } 
    ] 
    } 

这是我已经能够实现，但我stucked

对象为JSON

class Trend: NSObject, JSONDecodable { 

    var _name: String? 
    var _query: String? 
    var _tweet_volume: Int? 
    var _tweets_sata: [TweetsSatum]? 


required init(_ json: [String: Any]) { 
    super.init() 

    _name = json["name"] as? String 
    _query = json["query"] as? String 
    _tweet_volume = json["tweet_volume"] as? Int 
    _tweets_sata = json["tweets_sata"] as? [TweetsSatum] 
} 


class TweetsSatum: NSObject { 
    var _tweet: String? 
    var _user: String? 

    required init(_ json: [String: Any]) { 
     super.init() 
    _tweet = json["tweet"] as? String 
     _user = json["user"] as? String 
    } 

} 

JSONDecode协议

protocol JSONDecodable { 
    init?(_ json: [String: Any]) 
} 

Answer 1

没有你的自定义协议简单的解决方案 - 鸣叫类可以被约束为[String:String]。

它为String和Int值使用提到的nil合并运算符，并为tweetsSata（命名遵循Swift约定，这不是JavaScript或PHP）创建默认空数组。

此外 - 为了更好的可读性 - 不要忽略初始值设定项中的参数标签。

class Trend: NSObject { 

    let name: String 
    let query: String 
    let tweetVolume: Int 
    var tweetsSata = [TweetsSatum]() 

    required init(json: [String: Any]) { 
     name = json["name"] as? String ?? "" 
     query = json["query"] as? String ?? "" 
     tweetVolume = json["tweet_volume"] as? Int ?? 0 
     if let tweets = json["tweets_sata"] as? [[String:String]] { 
      tweetsSata = tweets.map { TweetsSatum(json:$0) } 
     } 
    } 


    class TweetsSatum: NSObject { 
     let tweet: String 
     let user: String 

     required init(json: [String: String]) { 
      tweet = json["tweet"] ?? "" 
      user = json["user"] ?? "" 
     } 
    } 
} 

考虑，除非你真的需要符合的NSObject协议使用来自NSObject继承结构而不是类。