Populate tableview in swift - xcode

Question

I have this result after parsing XML result.
When I do a println() I get the result perfectly like this
{
description = "Suzuki SX4 - BB71521";
deviceID = 359710042040320;
}
{
description = "Chevrolet Tahoe Noir - Demonstration";
deviceID = 359710042067463;
}
{
description = "Isuzu D'Max AA-08612";
deviceID = 359710042091273;
}
{
description = "Toyota 4 Runner";
deviceID = 359710042110768;
}
But when I try to parse the same result in an UITableView with two Cells, the UITableView appears empty.
Please help me to populate only the table ???
Here is my code
import UIKit
class mtTableViewController: UITableViewController, NSXMLParserDelegate {
var info = NSDictionary();
var parser = NSXMLParser()
var posts = NSMutableArray()
var elements = NSMutableDictionary()
var element = NSString()
override func viewDidLoad()
{
super.viewDidLoad()
self.beginParsing()
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func beginParsing()
{
let url = NSURL(string: "http://localhost:8080")
var auth =
"<GTSRequest command=\"dbget\">" +
"<Authorization account=\"" + "easytrucking" + "\" user=\"" + "admin" + "\" password=\"" + "T8095634934ht" + "\"/>" +
"<Record table=\"Device\" partial=\"true\">" +
"<Field name=\"accountID\">" + "easytrucking" + "</Field>" +
"<Field name=\"description\"/>" +
"</Record>" +
"</GTSRequest>";
// "<Authorization account=\"" + txtAccount.text + "\" user=\"" + txtUserName.text + "\" password=\"" + txtPassword.text + "\"/>" +
let request = NSMutableURLRequest(URL: url!)
request.HTTPMethod = "POST"
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
let data : NSData = (auth).dataUsingEncoding(NSUTF8StringEncoding)!;
request.HTTPBody = data;
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) {(response, data, error) in
/// println(NSString(data: data, encoding: NSUTF8StringEncoding))
let xml = SWXMLHash.parse(data)
let count = xml["GTSResponse"]["Record"].all.count
for var i = 0; i < count; i++
{
if (xml["GTSResponse"]["Record"][i]["Field"][1].element?.attributes["name"] == "deviceID")
{
self.elements.setObject((xml["GTSResponse"]["Record"][i]["Field"][1].element?.text)!, forKey: "deviceID")
}
if (xml["GTSResponse"]["Record"][i]["Field"][3].element?.attributes["name"] == "description")
{
self.elements.setObject((xml["GTSResponse"]["Record"][i]["Field"][3].element?.text)!, forKey: "description")
}
self.posts.addObject(self.elements)
// here i print the result
println(self.elements)
}
}
}
//Tableview Methods
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return posts.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
var cell : UITableViewCell! = tableView.dequeueReusableCellWithIdentifier("Cell") as UITableViewCell
if(cell == nil) {
cell = NSBundle.mainBundle().loadNibNamed("Cell", owner: self, options: nil)[0] as UITableViewCell;
}
cell.textLabel?.text = posts.objectAtIndex(indexPath.row).valueForKey("deviceID") as NSString
cell.detailTextLabel?.text = posts.objectAtIndex(indexPath.row).valueForKey("description") as NSString
return cell as UITableViewCell
}
}
Please help !!!

Answer 1

There are two problems. First, NSURLConnection.sendAsynchronousRequest()
– as the name indicates – works asynchronously: It initiates a network
request and then returns. The completion handler is called later, when
the data is has arrived. Then you have to reload the table view with
tableView.reloadData()
after populating the data source array with the new data.
Second, in
for var i = 0; i < count; i++
{
self.elements.setObject(..., forKey: ...)
self.elements.setObject(..., forKey: ...)
// ...
self.posts.addObject(self.elements)
}
you are modifying the same dictionary again and again. NSMutableArray
and NSMutableDictionary are reference types, therefore you end up
with an array containing count pointers to the same dictionary
(containing the data from the last loop execution).
Instead of a having a single dictionary as property
var elements = NSMutableDictionary()
this should be a local variable in your loop:
for var i = 0; i < count; i++
{
var elements = NSMutableDictionary()
self.elements.setObject(..., forKey: ...)
self.elements.setObject(..., forKey: ...)
// ...
self.posts.addObject(elements)
}
You might also consider to use Swift arrays and dictionaries instead.
These are value types which makes this kind of error much less
likely.