我正在考虑检查互联网连接并显示一条消息(如果这里没有连接)，所以现在我有一个 TableView，我想我必须删除或替换此 TableView 或仅显示一个单元格并显示一条消息就像“没有互联网连接”，所以首先我添加了一个文件来检查连接，所以我这样做了:
override func viewDidLoad()
{
super.viewDidLoad()
self.navigationController?.navigationBar.barTintColor = UIColor(red: 38.0/255.0, green: 51.0/255.0, blue: 85.0/255.0, alpha: 1.0)
self.navigationController?.navigationBar.titleTextAttributes = [NSFontAttributeName: UIFont(name: "Gotham", size: 13)!, NSForegroundColorAttributeName : UIColor.whiteColor()]
self.title = "ACTUALITÉS"
if Reachability.isConnectedToNetwork() == true {
self.beginParsing()
} else {
//Here I'm gonna do something and display an image
}
}
@IBAction func menuTapped(sender: AnyObject) {
print(delegate)
delegate?.toggleLeftPanel?()
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func beginParsing()
{
posts = []
parser = NSXMLParser(contentsOfURL:(NSURL(string:"url..."))!)!
parser.delegate = self
parser.parse()
tableView!.reloadData()
}
//XMLParser Methods
func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String])
{
element = elementName
if (elementName as NSString).isEqualToString("item")
{
elements = NSMutableDictionary()
elements = [:]
title1 = NSMutableString()
title1 = ""
date = NSMutableString()
date = ""
dscrptn = NSMutableString()
dscrptn = ""
url = NSURL()
urlString = NSMutableString()
urlString = ""
} else {
title1 = NSMutableString()
title1 = "No connection"
}
}
func parser(parser: NSXMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?)
{
if (elementName as NSString).isEqualToString("item") {
if !title1.isEqual(nil) {
elements.setObject(title1, forKey: "title")
}
if !date.isEqual(nil) {
elements.setObject(date, forKey: "date")
}
if !dscrptn.isEqual(nil) {
elements.setObject(dscrptn, forKey: "dscrptn")
}
if !urlString.isEqual(nil) {
elements.setObject(urlString, forKey: "urlString")
}
posts.addObject(elements)
}
}
func parser(parser: NSXMLParser, foundCharacters string: String)
{
if element.isEqualToString("title") {
title1.appendString(string)
} else if element.isEqualToString("pubDate") {
date.appendString(string)
} else if element.isEqualToString("description") {
dscrptn.appendString(string)
} else if element.isEqualToString("link") {
urlString.appendString(string)
}
}
//Tableview Methods
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return posts.count
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let trimUrl = posts.objectAtIndex(indexPath.row).valueForKey("urlString") as! String
UIApplication.sharedApplication().openURL(NSURL(string: trimUrl.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()))!)
}
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return 10
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
return basicCellAtIndexPath(indexPath)
}
func basicCellAtIndexPath(indexPath:NSIndexPath) -> ActuTblCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell") as! ActuTblCell
setTitleForCell(cell, indexPath: indexPath)
setDateForCell(cell, indexPath: indexPath)
setDescriptionForCell(cell, indexPath: indexPath)
return cell
}
func setTitleForCell(cell:ActuTblCell, indexPath:NSIndexPath) {
cell.titleActuCell?.text = posts.objectAtIndex(indexPath.row).valueForKey("title") as! NSString as String
}
func setDateForCell(cell:ActuTblCell, indexPath:NSIndexPath) {
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
let dateString = posts.objectAtIndex(indexPath.row).valueForKey("date") as! NSString as String
if let dateAdded = dateFormatter.dateFromString(dateString.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()))
{
dateFormatter.dateFormat = "dd/MM/yyyy"
cell.dateActuCell?.text = "\(dateFormatter.stringFromDate(dateAdded))"
}
//cell.dateActuCell?.text = posts.objectAtIndex(indexPath.row).valueForKey("date") as! NSString as String
}
func setDescriptionForCell(cell:ActuTblCell, indexPath:NSIndexPath) {
cell.descriptionActuCell?.text = (posts.objectAtIndex(indexPath.row).valueForKey("dscrptn") as! NSString as String).stripHTML()
}
}
let htmlReplaceString : String = "<[^>]+>"
extension NSString {
func stripHTML() -> NSString {
return self.stringByReplacingOccurrencesOfString(htmlReplaceString, withString: "", options: NSStringCompareOptions.RegularExpressionSearch, range: NSRange(location: 0,length: self.length)) as NSString
}
}
extension String {
func stripHTML() -> String {
return self.stringByReplacingOccurrencesOfString(htmlReplaceString, withString: "", options: NSStringCompareOptions.RegularExpressionSearch, range: nil)
}
}
我知道如何检查连接，但在这里我不知道什么是更好的解决方案以及如何做到这一点。
最佳答案
你想要实现的目标称为空状态。可以找到空状态的想法 www.pttrns.com 。在您的情况下，当没有网络连接时会显示空状态。另一种情况可能是网络连接可用，但解析内容 (XML/JSON) 后 post 数组的项目为零。
我建议您使用第 3 方代码:
- DZNEmptyDataSet ( objective-c )
- StatefulViewController (瑞士)
另一种方法是为 tableView 设置背景图像。我想注意背景图像的大小应与设备屏幕相同。你可以这样做:
let tempImageView = UIImageView(image: UIImage(named: "yourImage"))
tempImageView.frame = self.tableView.frame
self.tableView.backgroundView = tempImageView;
关于ios - Rss 解析器检查互联网连接并显示一条消息，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36149400/