swift - 在嵌套的字符串数组上使用 Swift decodable

Question

我正在尝试解码一个字符串数组，其中返回的 JSON 是一个字符串数组，但也包含嵌套数组

喜欢:

{ "people": ["Alice", "Bob"], 
"departments": [["Accounts", "Sales"]]
}

我的 Swift 代码:

let decoder = JSONDecoder()
let model = try decoder.decode([String:[String]].self, from: dataResponse)
print(model as Any)

我希望能够解码部门，但每次我这样做都会提示:

Error typeMismatch(Swift.String, Swift.DecodingError.Context(codingPath: [_DictionaryCodingKey(stringValue: "departments", intValue: nil), _JSONKey(stringValue: "Index 0", intValue: 0)], debugDescription: "Expected to decode String but found an array instead.", underlyingError: nil))

我知道这是因为解码器需要一个带有字符串数组的字符串

我想知道我是否也可以告诉它期待多个嵌套的字符串数组。

Answer 1

您只需要创建适当的结构并将其传递给解码器:

struct Root: Decodable {
    let people: [String]
    let departments: [[String]]
}

---

let decoder = JSONDecoder()
do {
    let model = try decoder.decode(Root.self, from: dataResponse)
     print(model.people)      // ["Alice", "Bob"]\n"
     print(model.departments) // [["Accounts", "Sales"]]\n"
} catch {
    print(error) 
}