Question

解析XML结果后我得到了这个结果。

当我做println()时，我得到了完全像这样的结果

{
   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;
}

但是当我尝试使用两个单元格在UITableView中解析相同的结果时，UITableView显示为空。

请帮我填一下表???

这是我的代码

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
}
}

请帮助!!!

Answer 1

有两个问题。首先，NSURLConnection.sendAsynchronousRequest() - 如名称所示 - 异步工作：它启动网络请求然后返回。稍后将调用完成处理程序数据已经到了。然后你必须用

重新加载表格视图

tableView.reloadData()

用新数据填充数据源数组后。

第二，在

for var i = 0; i < count; i++
{
    self.elements.setObject(..., forKey: ...)
    self.elements.setObject(..., forKey: ...)
    // ...
    self.posts.addObject(self.elements)
}

您一次又一次地修改相同的字典。 NSMutableArray 并且NSMutableDictionary是引用类型，因此您最终会成功包含指向同一字典的count指针的数组（包含上一次循环执行的数据）。

而不是将单个字典作为属性

var elements = NSMutableDictionary()

这应该是循环中的局部变量：

for var i = 0; i < count; i++
{
    var elements = NSMutableDictionary()
    self.elements.setObject(..., forKey: ...)
    self.elements.setObject(..., forKey: ...)
    // ...
    self.posts.addObject(elements)
}

您也可以考虑使用Swift数组和字典。这些是值类型，这使得这种错误更少可能的。

在swift中填充tableview

1 个答案: