在IOS中,提供了一套解析XML数据的API。其实也很简单,就是NSXMLParser和NSXMLParserDelegate。
可以直接指定到XML的URL去实例化NSXMLParser
public convenience init?(contentsOfURL url: NSURL)
解析文件,返回的是一次解析的结果
NSXMLParser.parse() -> Bool
监听解析节点的属性
NSXMLParserDelegate.parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String])
监听解析节点的内容
NSXMLParserDelegate.parser(parser: NSXMLParser, foundCharacters string: String)
示例:
这里介绍基本的xml数据解析并打印出来.
1.准备xml数据
打开记事本,写下:
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<? xml version = "1.0" encoding = "utf-8" ?>
< students >
< student id = "001" >
< name >Bill Gates</ name >
< age >15</ age >
</ student >
< student id = "002" >
< name >Tim Cook</ name >
< age >18</ age >
</ student >
</ students >
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保存命名为data.xml.
2.解析xml
在Xcode中新建一个项目,把data.xml导入新建的工程中,直接拖进去好了.在ViewController.swift里写下如下代码:
class ViewController: UIViewController,NSXMLParserDelegate{
override func viewDidLoad() {
super.viewDidLoad()
let parser = NSXMLParser(contentsOfURL: NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("data", ofType: "xml")!))
//1
parser!.delegate = self
parser!.parse()
}
var currentNodeName:String!
func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
currentNodeName = elementName
if elementName == "student"{
if let id = attributeDict["id"]{
print("id:\(id)")
}
}
}
func parser(parser: NSXMLParser, foundCharacters string: String) {
//2
let str = string.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
if str != "" {
print("\(currentNodeName):\(str)")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
代码注释:
1.使用NSXMLParser需要NSXMLParserDelegate代理
2.去除打印如<student>的标签,如果直接写成
func parser(parser: NSXMLParser, foundCharacters string: String) {
print("\(string):\(str)")
}
将会把前面的标签打印出来.
3.代码运行结果
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id:001
name:Bill Gates
age:15
id:002
name:Tim Cook
age:18
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