ios - 使用字符替换制作有效的 jSON 字符串

Question

我正在用 Swift 4.2 编写一个 iOS 应用

服务器正在响应带有无效字符的低质量 json。我必须替换一些字符以使其成为有效的 json 字符串，但我做不到。

服务器响应字符串:

{\"fieldsets\":[{\"properties\":[{\"alias\":\"categories\",\"value\":\"Equity\"},{\"alias\":\"subCategory\",\"value\":\"[\r\n \\"Banking\\",\r\n \\"FMCG\\",\r\n \\"Infrastructure\\",\r\n \\"International Funds\\",\r\n \\"Large Cap\\",\r\n \\"Large & Mid Cap\\",\r\n \\"Mid Cap\\",\r\n \\"Balanced Fund\\",\r\n \\"Multi Cap\\",\r\n \\"Others\\",\r\n \\"Pharma\\",\r\n \\"Tax Planning\\",\r\n \\"Daily\\",\r\n \\"Small Cap\\",\r\n \\"Mid & Small Cap\\",\r\n \\"Diversified\\"\r\n]\"},{\"alias\":\"icon\",\"value\":\"/media/1138/equity.png\"}],\"alias\":\"categoriesSubCategories\",\"disabled\":false,\"id\":\"170e1ba0-6f05-4a11-a2a6-04e108e7fa1f\",\"releaseDate\":null,\"expireDate\":null,\"allowedMemberGroups\":\"\"},{\"properties\":[{\"alias\":\"categories\",\"value\":\"Balanced\"},{\"alias\":\"subCategory\",\"value\":\"[\r\n \\"Debt-Oriented Aggressive\\",\r\n \\"Debt-Oriented Conservative\\",\r\n \\"credit opportunities\\",\r\n \\"Equity Oriented\\",\r\n \\"Asset Allocation\\",\r\n \\"Others\\",\r\n \\"Yearly\\",\r\n \\"Advance\\"\r\n]\"},{\"alias\":\"icon\",\"value\":\"/media/1139/balanced.png\"}],\"alias\":\"categoriesSubCategories\",\"disabled\":false,\"id\":\"aabf640c-1ba4-4136-9dd0-79f3dfd6b79b\",\"releaseDate\":null,\"expireDate\":null,\"allowedMemberGroups\":\"\"},{\"properties\":[{\"alias\":\"categories\",\"value\":\"Tax Saver\"},{\"alias\":\"subCategory\",\"value\":\"[\r\n \\"Any\\"\r\n]\"},{\"alias\":\"icon\",\"value\":\"/media/1140/tax-saver.png\"}],\"alias\":\"categoriesSubCategories\",\"disabled\":false,\"id\":\"fac9c316-16dc-48ab-bc0d-e8c22c02378f\",\"releaseDate\":null,\"expireDate\":null,\"allowedMemberGroups\":\"\"},{\"properties\":[{\"alias\":\"categories\",\"value\":\"Debt\"},{\"alias\":\"subCategory\",\"value\":\"[\r\n \\"Liquid\\",\r\n \\"FMP\\",\r\n \\"Gilt Medium & Long Term\\",\r\n \\"Gilt Short Term\\",\r\n \\"Income\\",\r\n \\"Others\\",\r\n \\"Short Term\\",\r\n \\"Ultra Short Term\\",\r\n \\"Mid Cap\\",\r\n \\"Small Cap\\",\r\n \\"Floaters\\",\r\n \\"Gilt Fund\\",\r\n \\"Dynamic Bond\\"\r\n]\"},{\"alias\":\"icon\",\"value\":\"/media/1141/debt.png\"}],\"alias\":\"categoriesSubCategories\",\"disabled\":false,\"id\":\"ef1efeda-3334-4a9b-bda7-afff76474a40\",\"releaseDate\":null,\"expireDate\":null,\"allowedMemberGroups\":\"\"}]}

我正在尝试使用:

     let convertedStr = jsonStr.replacingOccurrences(of: "\\r\\n", with: "", options: .literal, range: nil)
   let convertedStr2 = convertedStr.replacingOccurrences(of: "\\", with: "", options: .literal, range: nil)
  let convertedStr3 = convertedStr2.replacingOccurrences(of: "\"[", with: "", options: .literal, range: nil)
 let convertedStr4 = convertedStr3.replacingOccurrences(of: "]\"", with: "", options: .literal, range: nil)

这不成功。

Answer 1

您的 convertedStr3 和 convertedStr4 应该如下所示:

let convertedStr3 = convertedStr2.replacingOccurrences(of: "\"[", with: "[", options: .literal, range: nil)
let convertedStr4 = convertedStr3.replacingOccurrences(of: "]\"", with: "]", options: .literal, range: nil)

您的代码并不完全有效，因为您删除了 [ 和 ] 之类的字符，它们代表 json 中的数组。要修复它，请注意我在其中添加了 with: "[", 和 with: "]", 这使得替换成为可能:

• [ 与 [ 在 convertedStr3
• ]" 与 ] 在 convertedStr4

尝试print(convertedStr4)，您应该能够复制结果并检查它jsonlint.com验证 json 格式是否正确。