过去两天，我一直在尝试将我的XML解析数据加载到表中。我已经成功解析了数据并将其显示在控制台中。但是，我无法将数据加载到表中。到目前为止，我已经做了两次单独的尝试。
方法1：直接在视图控制器中解析功能-在控制台中成功显示已解析的数据。请注意，我的tableview函数当前未设置为符合此方法。
方法2：创建一个单独的.swift文件（XMLParse.swift）来解析数据，并创建（regionTableViewViewCell.swift）必要的UILabel元素。 -当前在运行应用程序时在控制台中显示nil。
下面是这三个文件中的代码。非常感谢您能帮助我的文件配置为上述两种方法之一。我现在在xCode中工作只有两个星期，所以我确定我的代码很糟糕。如果有人愿意花时间完善我的代码并告诉我正确的编写方式，我将不胜感激。
主要ViewController和方法1：ParseDataViewController.swift
import Foundation
import UIKit
import Firebase
class ParseDataViewController: UIViewController, UITableViewDelegate,
XMLParserDelegate, UISearchBarDelegate {
@IBOutlet weak var myTableView: UITableView!
@IBOutlet weak var searchBar: UISearchBar!
@IBOutlet weak var countyLabel: UILabel!
@IBOutlet weak var zindexLabel: UILabel!
@IBOutlet weak var tableView: UITableView!
private var regionItems: [RegionItem]?
var searchActive : Bool = false
let county = ""
let recordKey = "region"
let dictionaryKeys = Set<String>(["id","name","zindex"])
// a few variables to hold the results as we parse the XML
var results: [[String: String]]! // the whole array of dictionaries
var currentDictionary: [String: String]! // the current dictionary
var currentValue: String? // the current value for one of the keys in the dictionary
override func viewDidLoad() {
super .viewDidLoad()
fetchData()
print([regionItems])
searchBar.delegate = self
self.tableView.dataSource = self
self.tableView.delegate = self
let urlString = "https://www.zillow.com/webservice/GetRegionChildren.htm?<MYZILLOWKEY>&state=ca&childtype=county"
let url = URL(string: urlString)!
let task = URLSession.shared.dataTask(with: url) { data, response, error in
guard let data = data, error == nil else {
print(error ?? "Unknown error")
return
}
let parser = XMLParser(data: data)
parser.delegate = self
if parser.parse() {
//print(self.results ?? "Unknown error")
// Search 'results' array for specific county and set the index of the currentDictionary - currently set to "Los Angeles" but would like to be able to change it based on the value from the searchbar
let currentDictionary = self.results.filter { $0["name"] == "Los Angeles" }
if currentDictionary.isEmpty {
print("No results found")
print(self.county)
} else {
let currentValue = currentDictionary[0]
let zIndex = currentValue["zindex"]
let county = currentValue["name"]
print("The median price of a home in \(county!) is $\(zIndex!).")
}
}
}
task.resume()
}
private func fetchData() {
let dataParser = DataParser()
dataParser.parseData(url: "https://www.zillow.com/webservice/GetRegionChildren.htm?<MYZILLOWKEY>&state=ca&childtype=county") { (regionItems) in
self.regionItems = regionItems
OperationQueue.main.addOperation {
self.tableView.reloadSections(IndexSet(integer: 0), with: .left)
}
}
}
// Start Element
//
// If we're starting a "record" create the dictionary that will hold the results
// If we're starting one of our dictionary keys, initialize `currentValue` (otherwise leave `nil`)
func parserDidStartDocument(_ parser: XMLParser) {
results = []
}
func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String] = [:]) {
if elementName == recordKey {
self.currentDictionary = [String : String]()
} else if dictionaryKeys.contains(elementName) {
self.currentValue = String()
}
}
// Found Characters
//
// If this is an element we care about, append those characters.
// If 'currentValue' still 'nil', then do nothing.
func parser(_ parser: XMLParser, foundCharacters string: String) {
self.currentValue? += string
}
// End Element
//
// If we're at the end of the whole dictionary, then save that dictionary in our array
// If we're at the end of an element that belongs in the dictionary, then save that value in the dictionary
func parser(_ parser: XMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
if elementName == self.recordKey {
self.results.append(self.currentDictionary)
self.currentDictionary = nil
} else if dictionaryKeys.contains(elementName) {
self.currentDictionary[elementName] = currentValue
self.currentValue = nil
}
}
// If there's an error, report it.
func parser(_ parser: XMLParser, parseErrorOccurred parseError: Error) {
print(parseError)
self.currentValue = nil
self.currentDictionary = nil
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
let county = searchBar.text
countyLabel.text = searchBar.text
print("searchText \(county!)")
}
}
// Attempted to configure the below to work with method 2
extension ParseDataViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 150
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
guard let regionItems = regionItems else {
return 0
}
return regionItems.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! RegionTableViewCell
if let item = regionItems?[indexPath.item] {
cell.item = item
}
return cell
}
}
方法2：XMLParse.swift和RegionTableViewCell.swift
struct RegionItem {
var id: String
var name: String
var zindex: String
}
class DataParser: NSObject, XMLParserDelegate {
private var regionItem: [RegionItem] = []
private var currentElement = ""
private var currentId: String = "" {
didSet {
currentId = currentId.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
}
}
private var currentName: String = "" {
didSet {
currentName = currentName.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
}
}
private var currentZindex: String = ""
{
didSet {
currentZindex = currentZindex.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
}
}
private var parserCompletionHandler: (([RegionItem]) -> Void)?
func parseData(url: String, completionHandler: (([RegionItem]) -> Void)?)
{
self.parserCompletionHandler = completionHandler
let request = URLRequest(url: URL(string: url)!)
let urlSession = URLSession.shared
let task = urlSession.dataTask(with: request) { (data, response, error) in
guard let data = data else {
if let error = error {
print(error.localizedDescription)
}
return
}
// Parse XML Data
let parser = XMLParser(data: data)
parser.delegate = self
parser.parse()
}
task.resume()
}
// MARK: - XML Parser Delegate
func parser(_ parser: XMLParser, didStartElement elementName: String,
namespaceURI: String?, qualifiedName qName: String?, attributes
attributeDict: [String : String] = [:]) {
currentElement = elementName
if currentElement == "region" {
currentId = ""
currentName = ""
currentZindex = ""
}
}
func parser(_ parser: XMLParser, foundCharacters string: String) {
switch currentElement {
case "id": currentId += string
case "name": currentName += string
case "zindex": currentZindex += string
default: break
}
}
func parser(_ parser: XMLParser, didEndElement elementName: String,
namespaceURI: String?, qualifiedName qName: String?) {
if currentElement == "region" {
let regionItem = RegionItem(id: currentId, name: currentName,
zindex: currentZindex)
self.regionItem.append(regionItem)
}
}
func parserDidEndDocument(_ parser: XMLParser) {
parserCompletionHandler?(regionItem)
}
func parser(_ parser: XMLParser, parseErrorOccurred parseError: Error) {
print(parseError.localizedDescription)
}
}
regionTableViewCell.swift
class RegionTableViewCell: UITableViewCell {
@IBOutlet weak var idLabel: UILabel!
@IBOutlet weak var nameLabel: UILabel!
@IBOutlet weak var zindexLabel: UILabel!
var item: RegionItem! {
didSet {
idLabel.text = item.id
nameLabel.text = item.name
zindexLabel.text = item.zindex
}
}
}
来自控制台的XML数据：
some（[[[“ id”：“ 9”]，[“ id”：“ 3101”，“ name”：“洛杉矶”，“ zindex”：“ 485600”]，[“ id”：“ 2841 “，” name“：” San Diego“，” zindex“：” 463800“]，[” id“：” 1286“，” name“：” Orange“，” zindex“：” 627200“]，[” id“ ：“ 2832”，“ name”：“河滨”，“ zindex”：“ 298200”]，[“ id”：“ 3250”，“ name”：“圣贝纳迪诺”，“ zindex”：“ 257400”]，[ “ id”：“ 3136”，“ name”：“ Santa Clara”，“ zindex”：“ 830300”]，[“ id”：“ 1510”，“ name”：“ Alameda”，“ zindex”：“ 614500” ]，[“ id”：“ 3017”，“ name”：“萨克拉曼多”，“ zindex”：“ 283200”]，[“ id”：“ 3159”，“ name”：“ Contra Costa”，“ zindex”： “ 469500”]，[“ id”：“ 1018”，“名称”：“ Fresno”，“ zindex”：“ 184900”]，[“ id”：“ 204”，“名称”：“ Kern”，“ zindex “：” 166800“]，[” id“：” 3227“，” name“：”旧金山“，” zindex“：” 983200“]，[” id“：” 2061“，” name“：” Ventura“ ，“ zindex”：“ 499400”]，[“ id”：“ 2842”，“名称”：“ San Mateo”，“ zindex”：“ 882700”]，[“ id”：“ 3134”，“名称”： “圣华金”，“ zindex”：“ 240500”]，[“ id”：“ 3033”，“名称”：“ Stanislaus”，“ zindex”：“ 215200”]，[“ id”：“ 1396”，“ name“：” Sonoma“，” zindex“：” 485000“]，[” id“：” 1442“，” name“：” Tulare“，” zindex“：” 157900“]，[” id“：” 3229“，” name“：” Santa Barbara“，” zindex“：” 526500“]，[” id “：” 2444“，” name“：”蒙特雷“，” zindex“：” 420400“]，[” id“：” 1395“，” name“：” Solano“，” zindex“：” 314800“]，[ “ id”：“ 1325”，“ name”：“ Placer”，“ zindex”：“ 393500”]，[“ id”：“ 3261”，“ name”：“ San Luis Obispo”，“ zindex”：“ 487400” “]，[” id“：” 3025“，”名称“：” Santa Cruz“，” zindex“：” 627100“]，[” id“：” 1196“，”名称“：” Merced“]，[” id“：” 625“，” name“：” Marin“，” zindex“：” 897500“]，[” id“：” 418“，” name“：” Butte“，” zindex“：” 222500“]， [“ id”：“ 340”，“名称”：“ Yolo”，“ zindex”：“ 335800”]，[“ id”：“ 2691”，“名称”：“ El Dorado”，“ zindex”：“ 353900” “]，[” id“：” 1380“，” name“：” Shasta“，” zindex“：” 206900“]，[” id“：” 2354“，” name“：”帝国“，” zindex“： “ 155500”]，[“ id”：“ 1156”，“名称”：“ Madera”，“ zindex”：“ 187300”]，[“ id”：“ 580”，“ name”：“国王”，“ zindex “：” 155100“]，[” id“：” 255“，” name“：”纳帕“，” zindex“：” 490800“]，[” id“：” 2351“，” name“：”洪堡“， “ zindex”：“ 245400”]，[“ id”：“ 1261”，“ name”：“内华达州”，“ zinde x“：” 372100“]，[” id“：” 1415“，” name“：” Sutter“，” zindex“：” 210500“]，[” id“：” 2796“，” name“：” Mendocino“ ，“ zindex”：“ 323700”]，[“ id”：“ 346”，“ name”：“ Yuba”，“ zindex”：“ 181200”]，[“ id”：“ 217”，“ name”：“湖”，“ zindex”：“ 174800”]，[“ id”：“ 1426”，“名称”：“ Tehama”，“ zindex”：“ 144300”]，[“ id”：“ 3020”，“名称” ：“ San Benito”，“ zindex”：“ 410100”]，[“ id”：“ 2584”，“ name”：“ Tuolumne”，“ zindex”：“ 205100”]，[“ id”：“ 2643”， “名称”：“ Calaveras”，“ zindex”：“ 248300”]，[“ id”：“ 2548”，“ name”：“ Siskiyou”，“ zindex”：“ 167600”]，[“ id”：“ 829 “，” name“：” Amador“]，[” id“：” 1143“，” name“：” Lassen“，” zindex“：” 117300“]，[” id“：” 524“，” name“： “” Glenn“]，[” id“：” 2678“，”名称“：” Del Norte“]，[” id“：” 952“，”名称“：” Colusa“，” zindex“：” 182100“]， [“ id”：“ 1329”，“ name”：“ Plumas”]，[“ id”：“ 188”，“ name”：“ Inyo”，“ zindex”：“ 285700”]，[“ id”：“ 2403“，” name“：” Mariposa“，” zindex“：” 241800“]，[” id“：” 253“，” name“：” Mono“]，[” id“：” 2056“，” name“ ：“ Trinity”]，[“ id”：“ 647”，“ name”：“ Modoc”]，[“ id”：“ 1391”，“ name”：“ Sierra”，“ zindex”： “ 134800”]，[“ id”：“ 828”，“ name”：“ Alpine”]]）