[英]tableview: cellForRowAtIndexPath is not being called
I can't figure out what is wrong with my tableView: cellForRowAtIndexPath
. 我无法弄清楚
tableView: cellForRowAtIndexPath
有什么问题。 its never getting called for some reason. 它永远不会因为某种原因被召唤。 i have called the proper delegate and datasource.
我已经调用了适当的委托和数据源。 When I add a
print("")
line under the cellForRowAtIndexPath
function, it never appears when i simulate the app. 当我在
cellForRowAtIndexPath
函数下添加print("")
行时,当我模拟该应用程序时它永远不会出现。
Thank you in advanced. 在此先感谢您。
here is my code for the whole page: 这是我整个页面的代码:
class MainPageViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var sportCells = [PFObject]()
@IBOutlet weak var tableView: UITableView!
@IBOutlet weak var profilePictureImageView: UIImageView!
@IBOutlet weak var fullNameLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.dataSource = self
self.tableView.delegate = self
//Do any additional setup after loading the view.
}
override func viewDidAppear(animated: Bool) {
updateSportsTable()
print("its happening")
let lastName = PFUser.currentUser()! ["last_name"]
if let firstName = PFUser.currentUser()?["first_name"] as? String {
self.fullNameLabel.text = "\(firstName) \(lastName)"
}
if let userPicture = PFUser.currentUser()?["profile_picture"] as? PFFile {
userPicture.getDataInBackgroundWithBlock { (imageData: NSData?, error: NSError?) -> Void in
if (error == nil) {
self.profilePictureImageView.image = UIImage(data:imageData!)
}
}
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
print("sportCells count is \(sportCells.count)")
return sportCells.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
print("data extracted1")
let cell = tableView.dequeueReusableCellWithIdentifier("sportCell") as! SportTableViewCell
print("data extracted")
let sportPost = self.sportCells[indexPath.row]
let user = sportPost["user"] as! PFUser
print("data extracted")
do {
try user.fetchIfNeeded()
print("its happening 3rd time")
} catch _ {
print("There was an error")
}
cell.sportTitle.text = sportPost["basketballTitle"] as? String
cell.sportLogo.text = sportPost["basketballLogo"] as? String
cell.numberOfPOTM.text = "5"
return cell
}
func updateSportsTable() {
let query = PFQuery(className: "Sports")
query.findObjectsInBackgroundWithBlock { (sportCells:[PFObject]?, error:NSError?) -> Void in
if error == nil {
self.tableView.reloadData()
print("its happening again")
}
}
}
As confirmed from the comments, you problem is data population in model sportCells
. 如评论所确认,您的问题是模型
sportCells
数据填充。
Ensure that sportCells
is populated properly and that you call self.tableView.reloadData
after that. 确保正确填充
sportCells
,然后再调用self.tableView.reloadData
。
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