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我解析XML並從中獲取URL字符串。字典中的字符串值將字符串加倍
在didEndElement方法中，當我打印縮略圖值時，我得到了我所期望的。
element thumbnail: Optional(http://kyfbnewsroom.com/wp-content/uploads/2016/02/Quarles-CMYK-1-16-150x150.jpg)
問題出在cellForRowAtIndexPath。我從我的字典數組中獲得縮略圖值，但字符串看起來像這樣。 thumbString: Optional("http://kyfbnewsroom.com/wp-content/uploads/2016/02/Quarles-CMYK-1-16-150x150.jpghttp://kyfbnewsroom.com/wp-content/uploads/2016/02/Quarles-CMYK-1-16-150x150.jpg")
這裏是我的字典當我打印posts.objectAtIndex（indexPath.row））
posts: {
link = "http://kyfbnewsroom.com/state-ag-department-assisted-the-farm-community-through-a-month-marked-by-challenges/\n\t\t";
thumbnail = "http://kyfbnewsroom.com/wp-content/uploads/2016/02/Quarles-CMYK-1-16-150x150.jpghttp://kyfbnewsroom.com/wp-content/uploads/2016/02/Quarles-CMYK-1-16-150x150.jpg";
title = "State ag department assisted the farm community through a month marked by challenges\n\t\t";
}
這裏是所有的代碼。
import UIKit
import SafariServices
class NewsFeedTableViewController: UITableViewController, NSXMLParserDelegate, NSURLConnectionDelegate, NSURLConnectionDataDelegate, UINavigationControllerDelegate, SFSafariViewControllerDelegate, APLSlideMenuViewControllerDelegate {
var urlString = NSString()
var parser = NSXMLParser()
var posts = NSMutableArray()
var elements = NSMutableDictionary()
var element = NSString()
var itemTitle = NSMutableString()
var link = NSMutableString()
var thumbnailURL = NSMutableString()
var isActionAlert = false
var attributes = NSDictionary()
var connection: NSURLConnection?
var xmlData: NSMutableData?
var loadingIndicator = UIActivityIndicatorView()
var backgroundImage = UIImage()
var backgroundImageView = UIImageView()
let kfbBlue = UIColor(red: 8.0/255.0, green: 77.0/255.0, blue: 139.0/255.0, alpha: 0.7)
override func viewDidLoad() {
super.viewDidLoad()
tableView.registerNib(UINib(nibName: "NewsCell", bundle: nil), forCellReuseIdentifier: "newsCell")
let menuButton = UIBarButtonItem(image: UIImage(named: "list_button"), style: .Done, target: self, action: "showMenu")
self.navigationItem.leftBarButtonItem = menuButton
let reloadButton = UIBarButtonItem(barButtonSystemItem: .Refresh, target: self, action: "reload")
self.navigationItem.rightBarButtonItem = reloadButton
backgroundImageView = UIImageView(image: backgroundImage)
tableView.backgroundView = backgroundImageView
let width = CGRectGetWidth(self.view.bounds)
let height = CGRectGetHeight(self.view.bounds)
loadingIndicator = UIActivityIndicatorView(frame: CGRectMake(width/2, height/2, 75, 75))
loadingIndicator.layer.cornerRadius = 10
loadingIndicator.backgroundColor = kfbBlue
loadingIndicator.center = CGPointMake(width/2, height/2 - 37)
loadingIndicator.activityIndicatorViewStyle = .WhiteLarge
loadingIndicator.hidesWhenStopped = true
tableView.addSubview(loadingIndicator)
loadingIndicator.startAnimating()
}
override func viewDidDisappear(animated: Bool) {
loadingIndicator.stopAnimating()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func showMenu() {
self.slideMenuController().showLeftMenu(true)
}
func beginParsing() {
posts = []
xmlData = NSMutableData()
let url = NSURL(string: self.urlString as String)
let req = NSURLRequest(URL: url!)
connection = NSURLConnection(request: req, delegate: self, startImmediately: true)!
}
func reload() {
loadingIndicator.startAnimating()
self.beginParsing()
}
// MARK: - NSURLConnection Methods
func connection(connection: NSURLConnection, didReceiveData data: NSData) {
xmlData!.appendData(data)
}
func connectionDidFinishLoading(connection: NSURLConnection) {
loadingIndicator.stopAnimating()
let effectImage = self.backgroundImage.applyDarkEffect()
self.backgroundImageView.image = effectImage
parser = NSXMLParser(data: self.xmlData!)
parser.delegate = self
parser.parse()
xmlData = nil
tableView.reloadData()
}
func connection(connection: NSURLConnection, didFailWithError error: NSError) {
self.connection = nil
self.xmlData = nil
loadingIndicator.stopAnimating()
let errorString = NSString(format: "Fetch failed: %@", error.localizedDescription)
TSMessage.showNotificationWithTitle("Network Error", subtitle: errorString as String, type: .Error)
}
// MARK: - XML Parser Methods
func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
attributes = attributeDict
element = elementName
if ((elementName as NSString).isEqualToString("item")) {
elements = NSMutableDictionary()
elements = [:]
itemTitle = NSMutableString()
itemTitle = ""
link = NSMutableString()
link = ""
thumbnailURL = NSMutableString()
thumbnailURL = ""
}
}
func parser(parser: NSXMLParser, foundCharacters string: String) {
if (string == "Action Alert") {
self.isActionAlert = true
}
if (element.isEqualToString("title")) {
itemTitle.appendString(string)
} else if (element.isEqualToString("link")) {
link.appendString(string)
} else if (element.isEqualToString("media:thumbnail")) {
thumbnailURL.appendString(attributes.objectForKey("url") as! String)
}
}
func parser(parser: NSXMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
if (!isActionAlert) {
if ((elementName as NSString).isEqualToString("item")) {
if !itemTitle.isEqual(nil) {
elements.setObject(itemTitle, forKey: "title")
}
if !link.isEqual(nil) {
elements.setObject(link, forKey: "link")
}
if !thumbnailURL.isEqual(nil) {
elements.setObject(thumbnailURL, forKey: "thumbnail")
}
print("element thumbnail: %@", elements.valueForKey("thumbnail"))
posts.addObject(elements)
}
}
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return 136
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("newsCell", forIndexPath: indexPath) as! NewsCell
cell.newsTitle?.text = posts.objectAtIndex(indexPath.row).valueForKey("title") as? String
cell.newsTitle!.textColor = UIColor.whiteColor()
if (UIDevice.currentDevice().userInterfaceIdiom == .Phone) {
cell.newsTitle!.font = UIFont(name: "FranklinGothicStd-ExtraCond", size: 22.0)
} else {
cell.newsTitle!.font = UIFont(name: "FranklinGothicStd-ExtraCond", size: 30.0)
}
cell.backgroundColor = UIColor.clearColor()
cell.selectionStyle = .None
var thumbString = posts.objectAtIndex(indexPath.row).valueForKey("thumbnail") as? String
thumbString = thumbString!.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet())
thumbString = thumbString!.stringByReplacingOccurrencesOfString("%09%09", withString:"")
print("thumbString: ", thumbString)
let thumbURL = NSURL(string: thumbString!)
cell.newsThumb?.sd_setImageWithURL(thumbURL, placeholderImage: UIImage(named: "placeholder"))
cell.newsThumb!.layer.cornerRadius = 45.0
cell.newsThumb!.clipsToBounds = true
cell.newsThumb!.layer.borderWidth = 2.0
cell.newsThumb!.layer.borderColor = UIColor.clearColor().CGColor
cell.newsThumb!.backgroundColor = UIColor.clearColor()
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
var linkString = posts.objectAtIndex(indexPath.row).valueForKey("link") as? String
linkString = linkString!.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLQueryAllowedCharacterSet())
linkString = linkString?.stringByReplacingOccurrencesOfString("%09%09", withString:"")
let url = NSURL(string: linkString!)
let safariVC = SFSafariViewController(URL: url!, entersReaderIfAvailable: true)
safariVC.view.tintColor = kfbBlue
self.navigationController?.presentViewController(safariVC, animated: true, completion: nil)
}
}
有趣。看起來有更多的'帖子'比你顯示，因爲這看起來沒問題。順便說一下，你使用swift的方式不是很安全。在這方面，你不會得到任何超過客觀的C，使用武力解開和沒有如果 - 讓我們。 – SmokeDispenser
我只是展開力量，因爲我知道這些永遠不會是零。 – raginggoat
只是爲了興趣，你可以打印'posts.objectAtIndex（indexPath.row）' – zcui93