Question

已编辑代码2，现在它更具功能：这是我要解析的通用xml文件，我需要在publicID属性中获取描述文字和URL：

<xml>
<event publicID="smi:www.website.net/...">
   <type> </type>
  <description>
    <type> </type>
    <text> </text> 
  </description>
</event>
<event publicID="smi:www.website2.net/...">
   <type> </type>
  <description>
    <type> </type>
    <text> </text> 
  </description>
</event>
...

这是我的代码，根据XMLParserDelegate：

Import UIKit  

struct Event{
var urlEventi: String
}
struct Description {
var descrizioneTesto: String
}

var publicIDS: [Event] = []
var descrizioni: [Description] = []

var element: String = String()

var elementoPublicID: String = String()
var elementoDescription: String = String()

var eventPublicID = String()
var descriptionText = String()

在FirstViewController中，使用parser.parse（）和：

   // 1
    func parser(_ parser: XMLParser, didStartElement elemento: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String] = [:]) {

    if elementoPublicID == "event" {
        eventPublicID = attributeDict["publicID"] ?? "NIL"
    }
    if elementoDescription == "description" {
        descriptionText = String()
    }
    elementoPublicID = elemento
    elementoDescription = elemento

 }

    // 2
    func parser(_ parser: XMLParser, didEndElement elemento: String, namespaceURI: String?, qualifiedName qName: String?) {

    let urlEventoGenerico = Event(urlEventi: eventPublicID)
    let EventoGenerico = Description(descrizioneTesto: descriptionText)

    if elemento == "event" {
        publicIDS.append(urlEventoGenerico)
        print("PublicID:",urlEventoGenerico.urlEventi)
    }
    if elemento == "description" {
        descrizioni.append(EventoGenerico)
        print("DescriptionText:", EventoGenerico.descrizioneTesto)
    }

    }

    // 3
    func parser(_ parser: XMLParser, foundCharacters string: String) {
        let data = string.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)

    if (!data.isEmpty) {
        if elementoPublicID == "event" {
            eventPublicID += data
        }
        if elementoDescription == "text" {
            descriptionText += data
        }
    }

   }

好吧，解析非常适合描述文本，而URL列表是NIL的序列（如果我在解析过程中未在didStartElement中添加??“ NIL”，则会出现obv “致命错误：展开一个可选值时意外发现nil“ ）...那么，错误在哪里？谢谢！

PARSING RESULT:

PublicID: NIL
DescriptionText: perfect
PublicID: NIL
DescriptionText: perfect
PublicID: NIL
DescriptionText: perfect
...

使用Swift 5解析XML中的属性时出错

0 个答案: