我有一个集合视图，它有大约5个单元格。我从api中获取哪些内容以在集合视图中显示单元格数据。当用户单击任何单元格时，该适当的数据将显示在下表视图中。
现在，一切都运转正常。但是当我第一次加载我的观点时。我的表格视图中没有数据显示......我的意思是什么？默认情况下，集合视图单元格的第一个数据必须显示在tableview中。但我没有或无法展示。
如果我只点击任何单元格，我可以在表格视图中看到数据。但我需要的是 - 默认情况下，当我打开那个屏幕时，集合视图的第一个单元格必须显示在表视图中
怎么做？
这是我的代码：
@IBOutlet var BTCollectionView: UICollectionView!
@IBOutlet var DLTableView: UITableView!
var BTdata = [BTData]()
var Dealsdata = [DealsData]()
override func viewDidLoad()
{
super.viewDidLoad()
// nib for custom cell (table view)
let nib = UINib(nibName:"DealsListTableCell", bundle: nil)
DLTableView.registerNib(nib, forCellReuseIdentifier: "DealCell")
ListBusinessTypes()
}
// Values from Api for Business Types
func ListBusinessTypes()
{
let token = NSUserDefaults.standardUserDefaults().valueForKey("access_token") as! String
let headers = ["x-access-token": token]
let request = NSMutableURLRequest(URL: NSURL(string: "httpsome url")!,
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)
let ErrorAlert = UIAlertController(title: "Error", message: "Problem with internet connectivity or server, please try after some time", preferredStyle: UIAlertControllerStyle.Alert)
// add an action (button)
ErrorAlert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
// show the alert
self.presentViewController(ErrorAlert, animated: true, completion: nil)
}
else
{
if let json = (try? NSJSONSerialization.JSONObjectWithData(data!, options: [])) as? Dictionary<String,AnyObject>
{
let success = json["success"] as? Int
if(success == 1)
{
if let typeValues = json["data"] as? [NSDictionary]
{
dispatch_async(dispatch_get_main_queue(),{
for item in typeValues
{
self.BTdata.append(BTData(json:item))
self.BTCollectionView.reloadData()
}
})
}
}
else
{
let message = json["message"] as? String
print(message)
let ServerAlert = UIAlertController(title: "Error", message: message, preferredStyle: UIAlertControllerStyle.Alert)
// add an action (button)
ServerAlert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
// show the alert
self.presentViewController(ServerAlert, animated: true, completion: nil)
}
}
}
})
dataTask.resume()
}
// Mark : Collection View Delegate and Datasource(Business Type)
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
{
return BTdata.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell
{
let cell: DDLCollectionCell = collectionView.dequeueReusableCellWithReuseIdentifier("HCollectionCell", forIndexPath: indexPath) as! DDLCollectionCell
cell.BTName.text = BTdata[indexPath.row].BTNames
return cell
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath)
{
ListDeals(BTdata[indexPath.row].BTIds!)
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int
{
return 1
}
// number of rows
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return Dealsdata.count
}
// calling each cell based on tap and users ( premium / non premium )
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
let tabcell = tableView.dequeueReusableCellWithIdentifier("DealCell") as! DealsListTableCell
tabcell.DealName.text = Dealsdata[indexPath.row].DealNames
if let imgURL = NSURL(string: Dealsdata[indexPath.row].DealImageUrls!)
{
let request: NSURLRequest = NSURLRequest(URL: imgURL)
let session = NSURLSession.sharedSession()
let Imgtask = session.dataTaskWithRequest(request)
{
(data, response, error) -> Void in
if (error == nil && data != nil)
{
func display_image()
{
tabcell.DealImage.image = UIImage(data: data!)
}
dispatch_async(dispatch_get_main_queue(), display_image)
}
}
Imgtask.resume()
}
else
{
tabcell.DealImage.image = UIImage(named: "FBLogo")
}
let formatter = NSDateFormatter()
formatter.locale = NSLocale(localeIdentifier: "en_US")
formatter.dateFormat = "yyyy-MM-dd'T'hh:mm:ss.SSSSxxx"
let date = formatter.dateFromString(Dealsdata[indexPath.row].DealExpiry!)
let dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = .MediumStyle
dateFormatter.timeStyle = .NoStyle
dateFormatter.locale = NSLocale(localeIdentifier: "en_US")
let FormattedDate = dateFormatter.stringFromDate(date!)
tabcell.RegPriceLabel.text = String(Dealsdata[indexPath.row].DealRegularPrice!)
tabcell.SalePriceLabel.text = String(Dealsdata[indexPath.row].DealSalePrice!)
tabcell.DealExpiryDate.text = "Expiries on : "+FormattedDate
let BArrayValue:NSDictionary = Dealsdata[indexPath.row].DealBusinessDetails!
let BName = BArrayValue.valueForKey("business_name") as! String
let BImage = BArrayValue.valueForKey("images") as! NSArray
let BMainImage = BImage[0] as! NSDictionary
let FinalImage = BMainImage.valueForKey("url") as! String
if let imgURL2 = NSURL(string: FinalImage)
{
let request: NSURLRequest = NSURLRequest(URL: imgURL2)
let session = NSURLSession.sharedSession()
let Imgtask = session.dataTaskWithRequest(request)
{
(data, response, error) -> Void in
if (error == nil && data != nil)
{
func display_image()
{
tabcell.DealBusinessImage.image = UIImage(data: data!)
}
dispatch_async(dispatch_get_main_queue(), display_image)
}
}
Imgtask.resume()
}
else
{
tabcell.DealBusinessImage.image = UIImage(named: "FBLogo")
}
let BLatLng = Dealsdata[indexPath.row].DealCoordinates
let UserLocation = CLLocation(latitude: NewCurrentLatitude, longitude: NewCurrentLongitude)
let BusinessLocation = CLLocation(latitude: BLatLng![0] as! Double, longitude: BLatLng![1] as! Double)
let distance = UserLocation.distanceFromLocation(BusinessLocation) / 1000
tabcell.DealBusinessNameWithDistance.text = BName+" - "+String(format: "%.1f",distance)+" Km"
return tabcell
}
请帮帮我。谢谢！
我需要更改下面的任何内容：
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath)
{
ListDeals(BTdata[indexPath.row].BTIds!)
}
答案 0 :(得分：0)
尝试从API加载数据后调用ListDeals(BTdata[0].BTIds!)。
...
if let typeValues = json["data"] as? [NSDictionary]
{
dispatch_async(dispatch_get_main_queue(),{
for item in typeValues
{
self.BTdata.append(BTData(json:item))
self.BTCollectionView.reloadData()
}
ListDeals(BTdata[0].BTIds!)
})
}
...