【发布时间】：2015-12-28 08:21:47
【问题描述】：
我正在尝试让 NSXMLParser 在 Swift 2.0 中工作。我在 Swift 1 中有一个可以工作的解析器。我迁移到 Swift 2.0，现在解析器无法正常启动。
init(urlToUse: String)
{
self.eventFeedURL = urlToUse
super.init()
}
func beginParsing() {
// this should kick off the parsing functionality
// lastDate starts off as the current date/time and will be used later to update available articles
var lastDate = NSDate()
let feedURL:NSURL = NSURL(string: self.eventFeedURL)!
let feedParser:NSXMLParser? = NSXMLParser(contentsOfURL: feedURL)
if let actualFeedParser = feedParser {
// Download feed and parse out
actualFeedParser.delegate = self
actualFeedParser.parse()
}
}
func getAvailableEvents() -> [Event] {
return self.availableEvents
}
func updateAvailableEvents(newEvents:[Event]) {
// add the new day's events to the avaiable events
self.availableEvents += newEvents
// notify that new events are available from this parser
notificationCenter.postNotificationName("CityOfBoston_EventsUpdated", object: self)
}
// XML parsing functions specific to this feed
func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
// add any other XML tags you care about to the if statement below (via || (or) logic)
if elementName == "item" || elementName == "title" || elementName == "link" || elementName == "description" || elementName == "category" {
self.currentElement = elementName
self.attributes = attributeDict
}
if elementName == "item" {
// Start a new event
self.currentlyConstructingEvent = Event()
}
}
func parser(parser: NSXMLParser, foundCharacters string: String) {
// add any other XML tags you care about to the if statement below (via || (or) logic)
if self.currentElement == "item" ||
self.currentElement == "title" ||
self.currentElement == "description" ||
self.currentElement == "link" ||
self.currentElement == "category"{
self.foundCharacters += string
}
}
func parserDidEndDocument(parser: NSXMLParser) {
notificationCenter.postNotificationName("CityOfBoston_ParserFinished", object: self)
}
func parser(parser: NSXMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
if elementName == "title" {
// Parsing of the title element is complete, save the data
// update with appropriate title formatting
foundCharacters = foundCharacters.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
foundCharacters = foundCharacters.stringByReplacingOccurrencesOfString("'", withString: "'", options: [], range: nil)
let title:String = foundCharacters.stringByReplacingOccurrencesOfString(""", withString: "\"", options: [], range: nil)
self.currentlyConstructingEvent.setEventTitle(title)
【问题讨论】：
-
实现
parseErrorOccurred委托方法，看看是否有错误。 -
感谢您的建议。产生的错误是 "Optional(Error Domain=NSCocoaErrorDomain Code=-1 "(null)" UserInfo={NSXMLParserErrorMessage=Could not open data stream})"
-
正确的 url 被传递给解析器。我将进一步调查错误，但这让我指出了正确的方向。
-
我也遇到过这样的错误（Could not open data stream）。即使通过了正确的 url 并且它在 swift 1.X 中运行良好 ...
标签： ios swift2 nsxmlparser