[Swift5] XMLParserでXML解析

XMLParserの使い方メモ

・XMLParserDelegateを継承する
・メソッドの実装(didStartElement/foundCharacters/didEndElement)

class ViewController: UIViewController,XMLParserDelegate,UIViewControllerTransitioningDelegate {

    var userName = String()
    var profileImageUrl = URL(string: "")
    @IBOutlet weak var meigenLabel: UILabel!
    @IBOutlet weak var toFeedButton: UIButton!
    @IBOutlet weak var profileImage: UIImageView!

    var parser = XMLParser()

    var feedItem = [FeedItem()]
    var currentElementName:String!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        toFeedButton.layer.cornerRadius = toFeedButton.frame.width/8
        self.navigationController?.isNavigationBarHidden = true

        //XML解析
        let url = "http://meigen.xxxxx.xxx/"
        let urlToSend = URL(string: url)
        parser = XMLParser(contentsOf: urlToSend!)!
        parser.delegate = self
        parser.parse()
    }

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

        currentElementName = nil

        if elementName == "data"{
            self.feedItem.append(FeedItem())
        }else{
            currentElementName = elementName
        }
    }

    func parser(_ parser: XMLParser, foundCharacters string: String) {

        if self.feedItem.count > 0{
            //meigenとautherを処理していく
            let lastItem = self.feedItem[self.feedItem.count - 1]

            switch self.currentElementName {
            case "meigen":
                lastItem.meigen = string
            case "auther":
                lastItem.auther = string
                meigenLabel.text = lastItem.meigen + "\n" + lastItem.auther
            default:
                break
            }
        }
    }

    func parser(_ parser: XMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
        currentElementName = nil
    }
}