iOS swift中的xml解析

Question

我正在扫描 Aadhar 卡的条码或二维码。我收到以下 xml 格式的响应。如何使用 xml 解析将其转换为字典格式？

 <?xml version="1.0" encoding="UTF-8"?><PrintLetterBarcodeData uid="685860050795" name="Sangeetha D" gender="F" yob="1989" co="W/O: Dhanansekaran" house="632" street="saradhambal nagar" lm="agaramel" vtc="Nazarathpettai" po="Nazarethpettai" dist="Tiruvallur" subdist="Poonamallee" state="Tamil Nadu" pc="600123" dob="03/06/1989"/>

我尝试了以下代码进行解析

 public func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
    currentElement=elementName;

    print(currentElement)


}

public func parser(parser: NSXMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
    currentElement="";

}

public func parser(parser: NSXMLParser, foundCharacters string: String) {

}

但它总是返回 currentElement 作为“PrintLetterBarcodeData”

Answer 1

您所期望的 XML 结构似乎只包含根元素 PrintLetterBarcodeData 及其属性。

您将在didStartElement 委托方法的attributeDict 属性中找到根元素的属性。

例如，要提取name 属性，您可以：

public func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
    currentElement=elementName;
    print(currentElement)
    //print name
    if let name = attributeDict["name"] {
        print(name) //prints Sangeetha D
    }
}

Answer 2

这是我在 Swift 3 中基于我之前在 Swift 2.0 中编写的 Google News RSS reader 编写的一些解析代码。我修改了这段代码以处理PrintLetterBarcodeData 元素列表以及单个元素：

class BarcodeData {
    var uid: String
    var name: String
    var gender: String
    var yob: String
    var co: String
    var house: String
    var street: String
    var lm: String
    var vtc: String
    var po: String
    var dist: String
    var subdist: String
    var state: String
    var pc: String
    var dob: String

    init?(dictionary: [String : String]) {
        guard let uid = dictionary["uid"],
            let name = dictionary["name"],
            let gender = dictionary["gender"],
            let yob = dictionary["yob"],
            let co = dictionary["co"],
            let house = dictionary["house"],
            let street = dictionary["street"],
            let lm = dictionary["lm"],
            let vtc = dictionary["vtc"],
            let po = dictionary["po"],
            let dist = dictionary["dist"],
            let subdist = dictionary["subdist"],
            let state = dictionary["state"],
            let pc = dictionary["pc"],
            let dob = dictionary["dob"] else {
            return nil
        }

        self.uid = uid
        self.name = name
        self.gender = gender
        self.yob = yob
        self.co = co
        self.house = house
        self.street = street
        self.lm = lm
        self.vtc = vtc
        self.po = po
        self.dist = dist
        self.subdist = subdist
        self.state = state
        self.pc = pc
        self.dob = dob

    }
}

class MyParser: NSObject {
    var parser: XMLParser

    var barcodes = [BarcodeData]()

    init(xml: String) {
        parser = XMLParser(data: xml.data(using: String.Encoding.utf8)!)
        super.init()
        parser.delegate = self
    }

    func parseXML() -> [BarcodeData] {
        parser.parse()
        return barcodes
    }

}

extension MyParser: XMLParserDelegate {

    func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {

        if elementName == "PrintLetterBarcodeData" {

            if let barcode = BarcodeData(dictionary: attributeDict) {
                barcodes.append(barcode)
            }
        }
    }
}

用法：

let xmlString = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><PrintLetterBarcodeData uid=\"685860050795\" name=\"Sangeetha D\" gender=\"F\" yob=\"1989\" co=\"W/O: Dhanansekaran\" house=\"632\" street=\"saradhambal nagar\" lm=\"agaramel\" vtc=\"Nazarathpettai\" po=\"Nazarethpettai\" dist=\"Tiruvallur\" subdist=\"Poonamallee\" state=\"Tamil Nadu\" pc=\"600123\" dob=\"03/06/1989\"/>"

let parser = MyParser(xml: xmlString)
let barcodes = parser.parseXML() // array of barcodes
barcodes.first // your barcode