快速解析给定elementName的属性名称 [英] Swift parsing attribute name for given elementName

问题描述

这是我的网址的一部分

<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>

用户键入城市名称，例如:"Пицунда"，我想获取其ID.对于"Пицунда"，id为"10282".

User types the name of the city, for example: "Пицунда" and I want to get its id. For "Пицунда" id is "10282".

下面，我发布了无效的代码.

Below I've posted my not-working code.

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)并对其进行解析.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?

After all, I want to pass id to another URL file (export.yandex.ru/weather-ng/forecasts/{id of the city}.xml) and parse it. Do I need to create another Swift class and somehow connect it with first one?

推荐答案

构建[city:id]字典可以为您提供解决方案. 我已经根据有关NSXMLParser生命周期的文章(位于 http :)实现了一个简单的解决方案.//www.codeproject.com/Articles/248883/Objective-C-Fundamentals-NSXMLParser .

Building a dictionary of [city:id] can be a solution for you. I have implemented a simple solution based on the article about lifecycle of NSXMLParser at http://www.codeproject.com/Articles/248883/Objective-C-Fundamentals-NSXMLParser .

在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.

Following method is called when when an element is starting. You can retrieve city id attribute and save it in an instance level variable so that you can use it in the next method.

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，调用Follow方法.

And then, Following method is called when the parser see anything between starting and ending.

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.

So, you can get the city name from here. Now we have city id and city name to add a new item into the [city:id] dictionary.

建立字典后，搜索将非常简单.

Once you build the dictionary, searching would be very simple.

这是我的工作代码.

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?) {

    }

}

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