我在表视图中显示来自一个url的数据。但是当我第一次打开时。我看到两次相同的数据或者有些时候我的表视图中没有数据显示。
import UIKit
import CoreLocation
class ContainerViewController: UIViewController, CLLocationManagerDelegate, UITableViewDelegate, UITableViewDataSource {
// check the current view controller
weak var currentViewController: UIViewController?
// show the location
@IBOutlet weak var LocationLabel: UILabel!
var locationManager: CLLocationManager = CLLocationManager()
@IBOutlet var TypeLabel: UILabel!
@IBOutlet var TableViewList: UITableView!
var startLocation: CLLocation!
var NewCurrentLatitude: Double!
var NewCurrentLongitude: Double!
var BTdata = BTData?()
var BTypeId : String?
// array to store the value from json
var arrDict = [Businessdata]()
var selectedIndex:NSIndexPath?
override func viewDidLoad() {
super.viewDidLoad()
isSearching = false;
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
startLocation = nil
// nib for custom cell (table view)
let nib = UINib(nibName:"customCell", bundle: nil)
TableViewList.registerNib(nib, forCellReuseIdentifier: "cell")
// LoadBusinesses()
}
override func viewDidAppear(animated: Bool)
{
self.TypeLabel.text = BTdata?.BTNames
self.BTypeId = BTdata?.BTIds
locationManager.startUpdatingLocation()
}
// current location
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location : CLLocationCoordinate2D = manager.location!.coordinate;
CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {(placemarks, error)->Void in
if (error != nil)
{
print("Reverse geocoder failed with error" + error!.localizedDescription)
return
}
if placemarks!.count > 0
{
let pm : CLPlacemark = placemarks![0]
//stop updating location to save battery life
let locality = (pm.locality != nil) ? pm.locality : ""
let state = pm.administrativeArea
let countryCode = pm.ISOcountryCode
if(countryCode == "CAN")
{
self.LocationLabel.text = "in "+locality!+", "+state!
self.NewCurrentLongitude = location.longitude;
self.NewCurrentLatitude = location.latitude;
}
else
{
self.LocationLabel.text = "in Toronto, ON"
self.NewCurrentLatitude = 43.761539;
self.NewCurrentLongitude = -79.411079;
print("Manual location Label.")
}
self.locationManager.stopUpdatingLocation()
}
else
{
print("Problem with the data received from geocoder")
}
self.LoadBusinesses()
NSUserDefaults.standardUserDefaults().setDouble(self.NewCurrentLongitude, forKey: "UserLongitude")
NSUserDefaults.standardUserDefaults().setDouble(self.NewCurrentLatitude, forKey: "UserLatitude")
NSUserDefaults.standardUserDefaults().synchronize()
})
}
// location load failure
func locationManager(manager: CLLocationManager, didFailWithError error: NSError)
{
print("Error while updating location " + error.localizedDescription)
}
// web services method
func LoadBusinesses()
{
print("Inside Load Business")
let token = NSUserDefaults.standardUserDefaults().valueForKey("access_token") as! String
let headers = ["x-access-token": token]
var StringUrl:String = "http:some url"
StringUrl += "?lat=\(self.NewCurrentLatitude)"
StringUrl += "&long=\(self.NewCurrentLongitude)"
print(StringUrl)
let request = NSMutableURLRequest(URL: NSURL(string: StringUrl)!,
cachePolicy: .UseProtocolCachePolicy,
timeoutInterval: 10.0)
request.HTTPMethod = "GET"
request.allHTTPHeaderFields = headers
let session = NSURLSession.sharedSession()
let dataTask = session.dataTaskWithRequest(request, completionHandler: { (data, response, error) -> Void in
if (error != nil)
{
print(error)
}
else
{
if let json = (try? NSJSONSerialization.JSONObjectWithData(data!, options: [])) as? NSDictionary
{
let success = json["success"] as? Int
if (success == 1)
{
if let reposArray = json["data"] as? [NSDictionary]
{
self.arrDict.removeAll()
for item in reposArray
{
let itemObj = item as? Dictionary<String,AnyObject>
let b_type = itemObj!["business_type"]
// taxis type
if (b_type as? String == self.BTypeId)
{
self.arrDict.append(Businessdata(json:item))
print("load data")
}
}
dispatch_async(dispatch_get_main_queue(),{
self.TableViewList.reloadData()
print("load data 1")
})
}
}
else
{
let message = json["message"] as? String
print(message)
}
}
}
})
dataTask.resume()
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int
{
print("load data 2")
return self.arrDict.count
}
// number of rows
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return 1
}
// calling each cell based on tap and users ( premium / non premium )
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
print("load data 3")
let cell:customCell = self.TableViewList.dequeueReusableCellWithIdentifier("cell") as! customCell
cell.vendorName.text = arrDict[indexPath.row].BusinessName
cell.vendorAddress.text = arrDict[indexPath.row].Address
cell.VendorRating.rating = arrDict[indexPath.row].Rating!
return cell
}
// height of cell based on tap
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat
{
if(isTapped == true && selectedIndex == indexPath)
{
return 125.0;
}
return 80.0;
}
// did select row of table view
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{
selectedIndex = indexPath;
isTapped = true;
print("load data 4")
// TableViewList.reloadData();
}
}
我的完整代码。在同样的问题上我也面临着。同样的数据3次。在我的consloe中，打印功能也打印了两次。我测量了两次执行的功能：
load data 2
load data 2
load data 2
Manual location Label.
Inside Load Business
http://some url?lat=43.761539&long=-79.411079
load data
load data 2
load data 1
load data 3
0
1
2
3
4
答案 0 :(得分：0)
您的代码应该是这样的。在解析数据后，您应该重新加载tableView。
if let reposArray = json["data"] as? [NSDictionary] {
self.arrDict.removeAll()
for item in reposArray {
let itemObj = item as? Dictionary<String,AnyObject>
let b_type = itemObj!["business_type"]
// taxis type
if (b_type as? String == self.BTypeId) {
self.arrDict.append(Businessdata(json:item))
}
}
dispatch_async(dispatch_get_main_queue(),{
self.TableViewList.reloadData()
})
}