在Swift中对XML元素进行分组

import Foundation

class XMLParserDelegate: NSObject, XMLParserDelegate {
    var currentElement: String = ""
    var currentAttributes: [String: String] = [:]
    var groups: [String: [String]] = [:]
    var currentGroup: String = ""

    func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String] = [:]) {
        currentElement = elementName
        currentAttributes = attributeDict
    }

    func parser(_ parser: XMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
        if currentElement == "group" {
            currentGroup = currentAttributes["name"] ?? ""
            groups[currentGroup] = []
        } else if currentElement == "element" {
            let element = currentAttributes["name"] ?? ""
            groups[currentGroup]?.append(element)
        }
    }

    func parser(_ parser: XMLParser, foundCharacters string: String) {
        // Handle text content if needed
    }
}

// Usage example
let xmlString = """
<groups>
    <group name="Group 1">
        <element name="Element 1"/>
        <element name="Element 2"/>
    </group>
    <group name="Group 2">
        <element name="Element 3"/>
        <element name="Element 4"/>
    </group>
</groups>
"""

let data = xmlString.data(using: .utf8)
let parser = XMLParser(data: data!)
let delegate = XMLParserDelegate()
parser.delegate = delegate
parser.parse()

// Access the grouped elements
for (groupName, elements) in delegate.groups {
    print("Group: \(groupName)")
    for element in elements {
        print("- \(element)")
    }
}