这是我网址的一部分
<cities> <country name="Абхазия"> <city id="37188" region="27028" head="" type="3" country="Абхазия" part="" resort="" climate="">Новый Афон</city> <city id="37178" region="10282" head="" type="3" country="Абхазия" part="" resort="" climate="">Пицунда</city> <city id="37187" region="37187" head="" type="3" country="Абхазия" part="" resort="" climate="">Гудаута</city> <city id="37172" region="10280" head="" type="3" country="Абхазия" part="" resort="" climate="">Гагра</city> <city id="37189" region="10281" head="0" type="3" country="Абхазия" part="" resort="0" climate="">Сухум</city> </country>
用户输入城市名称,例如:"Пицунда"我想获取其ID。对于"Пицунда"id是"10282"。
"Пицунда"
"10282"
下面,我发布了我的无效代码。
var parser: NSXMLParser! var city: String = String() var ifDirOK = false var ifCityNameOK = false override func viewDidLoad() { super.viewDidLoad() let url: NSURL = NSURL(string: "https://pogoda.yandex.ru/static/cities.xml")! parser = NSXMLParser(contentsOfURL: url) parser.delegate = self parser.parse() } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } func parser(parser: NSXMLParser!, didStartElement elementName: String!, namespaceURI: String!, qualifiedName qName: String!, attributes attributeDict: [NSObject : AnyObject]!) { //let cityID = attributeDict ["id"] as? NSString if (elementName == "city"){ ifDirOK = true } } func parser(parser: NSXMLParser!, foundCharacters string: String!) { var data = string.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()) if (data == city){ ifCityNameOK = true } } func parser(parser: NSXMLParser!, foundAttributeDeclarationWithName attributeName: String!, forElement elementName: String!, type: String!, defaultValue: String!) { if (ifDirOK && ifCityNameOK){ println("\(attributeName)") } } func parser(parser: NSXMLParser!, didEndElement elementName: String!, namespaceURI: String!, qualifiedName qName: String!) { }
毕竟,我想将id传递给另一个URL文件(export.yandex.ru/weather-ng/forecasts/{id of the city}.xml)并进行解析。我是否需要创建另一个Swift类并以某种方式将其与第一个连接?
(export.yandex.ru/weather-ng/forecasts/{id of the city}.xml)
构建[city:id]字典可以为您提供解决方案。我基于http://www.codeproject.com/Articles/248883/Objective- C-Fundamentals- NSXMLParser上有关NSXMLParser生命周期的文章,实现了一个简单的解决方案。
当元素开始时,调用以下方法。您可以检索城市ID属性并将其保存在实例级别的变量中,以便可以在下一个方法中使用它。
func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [NSObject : AnyObject])
然后,当解析器看到开始和结束之间的任何内容时,将调用Following方法。
func parser(parser: NSXMLParser!, foundCharacters string: String!)
因此,您可以从此处获取城市名称。现在我们有了城市ID和城市名称,可以在[city:id]字典中添加新项目。
建立字典后,搜索将非常简单。
这是我的工作测试代码。
class ViewController: UIViewController ,NSXMLParserDelegate{ var parser: NSXMLParser! var city: String = String() var ifDirOK = false var ifCityNameOK = false var element : String? var value: String=String() var dic = Dictionary<String,String>() var currentCityId:String? @IBOutlet weak var result: UILabel! @IBOutlet weak var search: UITextField! //search text @IBAction func ActionGoGetIt(sender: AnyObject) { self.result.text=dic[self.search.text] } override func viewDidLoad() { super.viewDidLoad() let url: NSURL = NSURL(string: "https://pogoda.yandex.ru/static/cities.xml")! parser = NSXMLParser(contentsOfURL: url) parser.delegate = self parser.parse() } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [NSObject : AnyObject]) { element = elementName if (element == "city"){ ifDirOK = true let cityID = attributeDict ["id"] as? NSString self.currentCityId = cityID as? String } } func parser(parser: NSXMLParser!, foundCharacters string: String!) { var data = string.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()) if (!data.isEmpty){ if (element == "city"){ dic[data] = self.currentCityId as String? } } } func parser(parser: NSXMLParser, foundAttributeDeclarationWithName attributeName: String, forElement elementName: String, type: String?, defaultValue: String?) { if (ifDirOK && ifCityNameOK){ println("\(attributeName)") } } func parser(parser: NSXMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) { } }