swift如何解析字符串

Question

如何将下面的json数据提取出来

Status Code:
200

Headers:
Pragma: no-cache
Connection: keep-alive
X-Powered-By: PHP/5.5.9
Content-Length: 41
Server: nginx/1.0.15
Content-Type: text/html
Date: Fri, 29 Jan 2016 03:26:52 GMT
Set-Cookie: PHPSESSID=8038ftsgcq1jb6fpdt0o85u4h4; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0

Payload:
{"result":"1","shopid":"22","bossid":"1"}

Answer 1

func extractPayload(from: String, keyword: String = "Payload") -> String? {
  let lines = from.characters.split(separator: "\n").map { String($0) }
  for i in 0 ... lines.count {
    if lines[i].hasPrefix(keyword) {
      return lines[i+1]
    }
  }
  return nil
}//end func


let header = "Status Code:\n200\n\nHeaders:\nPragma: no-cache\nConnection: keep-alive\nX-Powered-By: PHP/5.5.9\nContent-Length: 41\nServer: nginx/1.0.15\nContent-Type: text/html\nDate: Fri, 29 Jan 2016 03:26:52 GMT\nSet-Cookie: PHPSESSID=8038ftsgcq1jb6fpdt0o85u4h4; path=/\nExpires: Thu, 19 Nov 1981 08:52:00 GMT\nCache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0\n\nPayload:\n{\"result\":\"1\",\"shopid\":\"22\",\"bossid\":\"1\"}"

guard let json = extractPayload(from: header) else {
  exit(0)
}

print(json)

得到json字符串后，可以用Perfect JSON 类库解析为字典，详见：Perfect JSON