如何解码扩展名为decodable的JSON嵌套字典数组？

我有这样的JSON：

{
  "states" : [
    "C",
    "A",
    "B",
    "Sink",
  ],
  "symbols" : [
    "c",
    "a",
    "b"
  ],
  "transitions" : [
    {
      "with" : "c",
      "to" : "B",
      "from" : "C"
    },
    {
      "with" : "c",
      "to" : "Sink",
      "from" : "C"
    },
    {
      "with" : "b",
      "to" : "B",
      "from" : "B"
    },
    {
      "with" : "b",
      "to" : "Sink",
      "from" : "B"
    },
    {
      "with" : "c",
      "to" : "C",
      "from" : "A"
    },
    {
      "with" : "c",
      "to" : "Sink",
      "from" : "A"
    },
    {
      "with" : "a",
      "to" : "A",
      "from" : "A"
    },
    {
      "with" : "a",
      "to" : "Sink",
      "from" : "A"
    }
  ],
  "initialState" : "A",
  "finalStates" : [
    "B"
  ]
}

我无法解码转换部分JSON（我需要像苹果那样解码）。 到目前为止，我得到的是这个（注释部分是前导错误类型不匹配（Swift.Dictionary，Swift.DecodingError.Context（codingPath:[]，debugDescription:“应该解码字典，但找到了一个数组。”，underlineerror:nil）））

---

key

transition

的值是一个字典数组，它变成了一个结构数组

struct Transition : Decodable {
   let with, to, from : String
}

然后解码

let transitions : [Transition]

---

所有

CodingKeys

和自定义

init

方法都是不需要的

键

transition

的值是一个字典数组，它成为一个结构数组

struct Transition : Decodable {
   let with, to, from : String
}

然后解码

let transitions : [Transition]

不需要所有

编码键

和自定义

init

方法

您需要

struct Transition: Decodable {
    let with,to,from:String
}

然后

也删除

public init(from decoder: Decoder)throws{
    let decoderContainer = try decoder.container(keyedBy: CodingKeys.self)
    states = try decoderContainer.decode([String].self, forKey: .states)
    symbols = try decoderContainer.decode([String].self, forKey: .symbols)
    initialState = try decoderContainer.decode(String.self, forKey: .initialState)
    finalStates = try decoderContainer.decode([String].self, forKey: .finalStates)
    /*
    let nestedContainer = try decoderContainer.nestedContainer(keyedBy: transitionInfoKeys.self, forKey: .transitions)
    with = try nestedContainer.decode([String].self, forKey: .with)
    to = try nestedContainer.decode([String].self, forKey: .to)
    from = try nestedContainer.decode([String].self, forKey: .from)
     */
}

由于这将自动发生，因此无需手动写入

struct Transition: Decodable {
    let with,to,from:String
}

然后

也删除

public init(from decoder: Decoder)throws{
    let decoderContainer = try decoder.container(keyedBy: CodingKeys.self)
    states = try decoderContainer.decode([String].self, forKey: .states)
    symbols = try decoderContainer.decode([String].self, forKey: .symbols)
    initialState = try decoderContainer.decode(String.self, forKey: .initialState)
    finalStates = try decoderContainer.decode([String].self, forKey: .finalStates)
    /*
    let nestedContainer = try decoderContainer.nestedContainer(keyedBy: transitionInfoKeys.self, forKey: .transitions)
    with = try nestedContainer.decode([String].self, forKey: .with)
    to = try nestedContainer.decode([String].self, forKey: .to)
    from = try nestedContainer.decode([String].self, forKey: .from)
     */
}

---

由于这将自动发生，因此无需手动写入

最终不清楚您想要什么。为什么要展平过渡？为什么注释具有struct

Transition:Codable{let with:String；let to:String；let from:String}

和在

FiniteAutomata

中：

let transitions:[Transition]

let with:[String]

不是一个好主意，因为您将失去与

从

和

到

的同步。不清楚您最终想要什么。为什么要展平过渡？为什么注释具有struct

Transition:Codable{let with:String；let to:String；let from:String}

和在

FiniteAutomata

中：

let transitions:[Transition]

let with:[String]

不是一个好主意，因为您将失去与

的同步，从

和

到

。谢谢，我不知道init是自动执行的。我不知道init是自动执行的