如何在Swift中从RSS中获取"src“字符串？

import Foundation

class RSSParser: NSObject, XMLParserDelegate {
    var srcString: String?
    var isTargetElement = false
    
    func parseRSS(from url: URL) {
        let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
            guard let data = data else {
                print("Failed to fetch RSS data: \(error?.localizedDescription ?? "")")
                return
            }
            
            let parser = XMLParser(data: data)
            parser.delegate = self
            parser.parse()
        }
        task.resume()
    }
    
    // XMLParserDelegate methods
    func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String] = [:]) {
        if elementName == "src" {
            isTargetElement = true
        }
    }
    
    func parser(_ parser: XMLParser, foundCharacters string: String) {
        if isTargetElement {
            srcString = string
            isTargetElement = false
        }
    }
}

// Usage
let rssURL = URL(string: "https://example.com/rss")!
let parser = RSSParser()
parser.parseRSS(from: rssURL)

// Access the "src" string
if let srcString = parser.srcString {
    print("Found src string: \(srcString)")
} else {
    print("Failed to find src string in the RSS feed.")
}