发布于 2016-04-26 03:55:23 | 247 次阅读 | 评论: 0 | 来源: 网友投递
Swift编程语言
SWIFT,苹果于2014年WWDC(苹果开发者大会)发布的新开发语言,可与Objective-C*共同运行于Mac OS和iOS平台,用于搭建基于苹果平台的应用程序。
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)
NSXMLParser.parse() -> Bool
NSXMLParserDelegate.parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String])
NSXMLParserDelegate.parser(parser: NSXMLParser, foundCharacters string: String)
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:
<?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>
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.
}
}
func parser(parser: NSXMLParser, foundCharacters string: String) {
print("\(string):\(str)")
}
3.代码运行结果
id:001
name:Bill Gates
age:15
id:002
name:Tim Cook
age:18