Question

我正在尝试访问一个名为“ block”的嵌套JSON变量，但似乎无法以任何尝试的方式对其进行访问。这是示例JSON消息和我的代码：

{“ account”：“ xrb_34tsctqcgctm8fhnpat351z4f64rgz8o9y7gwh1dutjf1r7iiwfzruawhatz”，“哈希”：“ E5935C559748444444D09E97D6D13FDB48B51F46A01FA9F6D6”“：\\” xrb_34tsctqcgctm8fhnpat351z4f64rgz8o9y7gwh1dutjf1r7iiwfzruawhatz \ “\ n \ ”以前的\“：\ ”78446816869EEEF4BC735B1A21AB33ED246A10303B87F0CAFD7CCD56406E0456 \“，\ n \ ”代表\“：\ ”xrb_3pczxuorp48td8645bs3m6c3xotxd3idskrenmi65rbrga5zmkemzhwkaznh \“，\ n \ ”平衡\“：\ ”320000000000000000000000000 \“，\ n \”链接\ “：\” 8DE4EE799910E26C5E44CDD345B8C8070E1955284BC407660825B425FBEDBB6B \ “\ n \ ”link_as_account \“：\ ”xrb_35h6xswsk694fjh6bmgmapwei3rg57ckiky61xm1ibfn6qxyugud9eo1fauk \“，\ n \ ”签名\“：\ ”E4AF5BBDF583509DF3147004AB61FEC04F9007AC23A46A2E2E5BE4B65D0788F45F89EEC7B62D0F42144A9F5EA090EF3F58262070F07C59F1AD752B5CC3BF9D04 \“，\ n \ ”工作\“：\” a56cb9e8d2539f73 \ “ \ n} \ n”，“金额”：“ 1`

struct IncomingBlock: Decodable {
    var account: String
    var hash: String

    struct Block: Decodable {
        var type: String
        var previous: String
        var link: String
        var link_as_account: String
        var representative: String
        var account: String
        var balance: String
        var work: String
        var signature: String
    }

    var block: Block
}

// in another file
guard let data = msg.data(using: .utf8) else { return }
guard let incomingBlock = try?JSONDecoder().decode(IncomingBlock.self, from: data) else { return }

Answer 1

基本上，要访问嵌套的JSON变量block，我必须解码初始的JSON消息

do{
  guard let data = inital_msg.data(using: .utf8) else { return }
  let incomingBlock = try JSONDecoder().decode(IncomingBlock.self, from: data) 
catch ...{}

，并将block的值强制转换为模型中的String。

struct IncomingBlock: Decodable {
var account: String
var hash: String
var block: String
}

之后，我又像这样对初始消息block字段进行了解码

//第二个JSON

let json = incomingBlock.block.data(using: .utf8)!

最后使用分离的块模型：

 struct BlockMeta: Decodable {
    var type: String
    var previous: String
    var link: String
    var link_as_account: String
    var representative: String
    var account: String
    var balance: String
    var work: String
    var signature: String
 }

我可以访问这些字段

 let block = try JSONDecoder().decode(BlockMeta.self, from: json)
 block.balance //returns "320000000000000000000000000"

我的JSON解码器无法正常工作，我不确定为什么

1 个答案: