arrays - 从 Swift 数组中获取特定值

Question

因此，我使用 SwiftyJSON 从 API 下载数据。我正在转换它，并循环获取所有结果。我试图打印出每个结果的特定部分，但似乎无法正常工作。

我在下面使用的代码获取 json，循环遍历它并打印出下面的内容。从打印的内容来看，我只想得到“主题”。

do {
            let jsonObj = try JSONSerialization.jsonObject(with: data, options: []) as! [String: AnyObject]
            let json = JSON(jsonObj)


            let pms: NSArray = json["result"]["pms"].arrayValue as NSArray


            let arrayLength = pms.count

            for var i in (0..<arrayLength) {
                let pm = pms[i]

                i+=1

            }

        } catch let error as NSError {
            print(error)
        }

然后给出如下值:

{
  "subject" : "Example",
  "status" : 1,
  "recipient" : 012345,
  "recipientusername" : "Example",
  "dateline" : "2018-01-01",
  "sender" : 012345,
  "pmid" : 012345,
  "senderusername" : "DoctorSheep"
}
{
  "subject" : "Example 2",
  "status" : 1,
  "recipient" : 678910,
  "recipientusername" : "Example 2",
  "dateline" : "2018-01-01",
  "sender" : 678910,
  "pmid" : 678910,
  "senderusername" : "Example 2"
}

如果我尝试类似的东西

let subject = pm["subject"]

我收到“Type 'Any' 没有下标成员”的错误。

Answer 1

let pms = json["result"]["pms"].arrayValue as Array


let arrayLength = pms.count

for var i in (0..<arrayLength) {
    let pm = pms[i]
    let subject = pm["subject"]
    print(subject)
    i+=1
}