我正在尝试解析一个简单的xml文件,但我一直收到错误
"错误说明:操作无法完成。 (可可错误-1。) 行号:0"
XML文件(名为mathquiz.xml,位于名为img的文件夹中):
<quiz>
<title>
Y1 Maths Quiz
</title>
<question>
<description>
What is 2+2
</description>
<answer>
4
</answer>
<answer>
3
</answer>
<answer>
2
</answer>
<answer>
1
</answer>
</question>
</quiz>
分析器:
//
// QuizXMLParser.swift
// MathQuiz
//
// Created by Raees on 22/06/2017.
// Copyright © 2017 Raees Apps. All rights reserved.
//
import Foundation
public class QuizXMLParser : NSObject, XMLParserDelegate {
var currentContent = ""
var quiz = Quiz()
var question = Question()
public func beginParsing(file url: String) {
guard let myURL = NSURL(string:url) else {
print("URL not defined properly")
return
}
guard let parser = XMLParser(contentsOf: myURL as URL) else {
print("Cannot Read Data")
return
}
parser.delegate = self
if !parser.parse(){
print("Data Errors Exist:")
let error = parser.parserError!
print("Error Description:\(error.localizedDescription)")
print("Line number: \(parser.lineNumber)")
}
}
public func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]){
print("Beginning tag: <\(elementName)>")
if elementName == "question" {
question = Question()
}
currentContent = ""
}
public func parser(_ parser: XMLParser, foundCharacters string: String){
currentContent += string
print("Added to make \(currentContent)")
}
public func parser(_ parser: XMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?){
print("ending tag: </\(elementName)> with contents:\(currentContent)")
switch elementName{
case "question":
quiz.questions.append(question)
print ("model has \(question)")
case"title":
quiz.title = currentContent
case "description":
if let index = Int(currentContent) {
quiz.currentQuestionIndex = index
}
case "answer":
question.answers.append(currentContent)
default:
return
}
}
}
在视图控制器中调用解析器:
let parser = QuizXMLParser()
parser.beginParsing(file: "img/mathquiz.xml")
如何让它成功解析XML文件?我没有看到任何问题。
答案 0 :(得分:0)
首先,为了从Bundle的内容中读取文件,请执行以下操作:
let parser = QuizXMLParser()
if let path = Bundle.main.url(forResource: "mathQuiz", withExtension: "xml") {
parser.beginParsing(file: path)
}
然后更改函数beginParsing(file url:String)以接受URL而不是String。
public func beginParsing(file url: URL) {
guard let parser = XMLParser(contentsOf: url) else {
print("Cannot Read Data")
return
}
parser.delegate = self
if !parser.parse(){
print("Data Errors Exist:")
let error = parser.parserError!
print("Error Description:\(error.localizedDescription)")
print("Line number: \(parser.lineNumber)")
}
}
这可以解决您的问题。