使用Swift 4 Decodable将字符串JSON响应转换为布尔值 [英] Convert string JSON response to a boolean using Swift 4 Decodable

问题描述

我正在重构以前使用第三方JSON解析器的一些项目，并且遇到了一个愚蠢的网站，该网站返回布尔值作为字符串.

I'm refactoring some projects where I'd previously used third-party JSON parsers and I've encountered a goofy site that returns a boolean as a string.

这是JSON响应中的相关代码段:

This is the relevant snippet from the JSON response:

{
    "delay": "false",
    /* a bunch of other keys*/
}

我的解码结构如下:

struct MyJSONStruct: Decodable {
  let delay: Bool
  // the rest of the keys
}

如何将JSON响应中返回的字符串转换为Bool以匹配Swift 4中的结构?虽然这篇文章很有帮助，我不知道如何将字符串响应转换为布尔值.

How would I convert the string returned in the JSON response into a Bool to match my struct in Swift 4? While this post was helpful, I can't figure out how to turn a string response into a boolean value.

推荐答案

基本上，您必须编写一个自定义的初始化程序，但是如果有许多 good 键，但只有一个键可以将一个类型映射到另一个计算属性可能有用

Basically you have to write a custom initializer but if there are many good keys but only one to map from a type to another a computed property might be useful

struct MyJSONStruct: Decodable {
   var delay: String
   // the rest of the keys

   var boolDelay : Bool {
       get { return delay == "true" }
       set { delay = newValue ? "true" : "false" }
   }
}

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