[英]Swift | TableView is Empty / Blank (using Custom Cell)
我的TableView是空的/只显示了空白单元格(屏幕快照)我尝试了使用TableViewController和使用TableView的ViewController两者-都显示了相同的结果。 在此处输入图片说明
因此,我试图确定问题的确切位置,并且似乎未读“ for-statement”。 (请参阅打印的支票)
我刚开始编码,但这没有任何意义,我在这里尝试了所有关于stackoverflow的好建议,但是似乎都没有用(所有插座都已连接等)。
同时发布两个变体:ViewController和TableViewController(它们都应获得相同的信息)
TableViewController:
import UIKit
import Parse
class HistoryTableViewController: UITableViewController {
var zeit = [String]()
var kosten = [String]()
var kilometer = [String]()
var datum = [String]()
override func viewDidLoad() {
super.viewDidLoad()
let query = PFQuery(className: "GemachteFahrten")
query.whereKey("gefahreneZeit", equalTo: (PFUser.current()?.objectId!)!)
query.whereKey("kosten", equalTo: (PFUser.current()?.objectId!)!)
query.whereKey("createdAt", equalTo: (PFUser.current()?.objectId!)!)
query.whereKey("gefahreneKilometer", equalTo: (PFUser.current()?.objectId!)!)
print("check1")
query.findObjectsInBackground { (objects, error) in
if error != nil {
print("error finding user data")
} else {
print("check2")
if let fahrtenRequests = objects {
self.zeit.removeAll()
self.datum.removeAll()
self.kosten.removeAll()
self.kilometer.removeAll()
print("check3")
for fahrtenRequest in fahrtenRequests {
print("check4")
self.zeit.append(fahrtenRequest["gefahreneZeit"] as! String!)
self.kosten.append(fahrtenRequest["kosten"] as! String)
self.datum.append(fahrtenRequest["createdAt"] as! String)
self.kilometer.append(fahrtenRequest["gefahreneKilometer"] as! String)
self.tableView.reloadData()
print("check5")
}
print("check6")
}
}
}
self.tableView.reloadData()
}
override func viewDidAppear(_ animated: Bool) {
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return datum.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CellHistory", for: indexPath) as! CellHistoryViewControllerTableViewCell
cell.durationCell.text = zeit[indexPath.row]
cell.costCell.text = kosten[indexPath.row]
cell.routeCell.text = kilometer[indexPath.row]
cell.dateCell.text = datum[indexPath.row]
return cell
}
在控制台中,它显示以下内容: 因此似乎未读for语句
看来这是问题所在吗? 还是我在其他地方做错了?
print("check3")
for fahrtenRequest in fahrtenRequests {
print("check4")
self.zeit.append(fahrtenRequest["gefahreneZeit"] as! String!)
self.kosten.append(fahrtenRequest["kosten"] as! String)
self.datum.append(fahrtenRequest["createdAt"] as! String)
self.kilometer.append(fahrtenRequest["gefahreneKilometer"] as! String)
self.tableView.reloadData()
print("check5")
}
print("check6")
这也是ViewController的另一个变体,并添加了TableView:
import UIKit
import Parse
class HistoryViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var zeit = [String]()
var kosten = [String]()
var kilometer = [String]()
var datum = [String]()
@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
let query = PFQuery(className: "GemachteFahrten")
query.whereKey("gefahreneZeit", equalTo: (PFUser.current()?.objectId!)!)
query.whereKey("kosten", equalTo: (PFUser.current()?.objectId!)!)
query.whereKey("createdAt", equalTo: (PFUser.current()?.objectId!)!)
query.whereKey("gefahreneKilometer", equalTo: (PFUser.current()?.objectId!)!)
print("check1")
query.findObjectsInBackground { (objects, error) in
if error != nil {
print("error finding user data")
} else {
print("check2")
if let fahrtenRequests = objects {
self.zeit.removeAll()
self.datum.removeAll()
self.kosten.removeAll()
self.kilometer.removeAll()
print("check3")
for fahrtenRequest in fahrtenRequests {
print("check4")
self.zeit.append(fahrtenRequest["gefahreneZeit"] as! String!)
self.kosten.append(fahrtenRequest["kosten"] as! String)
self.datum.append(fahrtenRequest["createdAt"] as! String)
self.kilometer.append(fahrtenRequest["gefahreneKilometer"] as! String)
self.tableView.reloadData()
print("check5")
}
print("check6")
}
}
}
self.tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
internal func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return datum.count
}
internal func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: CellHistoryViewControllerTableViewCell = tableView.dequeueReusableCell(withIdentifier: "CellHistory", for: indexPath) as! CellHistoryViewControllerTableViewCell
cell.durationCell.text = zeit[indexPath.row]
cell.costCell.text = kosten[indexPath.row]
cell.routeCell.text = kilometer[indexPath.row]
cell.dateCell.text = datum[indexPath.row]
return cell
}
这也是自定义单元代码:
import UIKit
class CellHistoryViewControllerTableViewCell: UITableViewCell {
@IBOutlet weak var dateCell: UILabel!
@IBOutlet weak var durationCell: UILabel!
@IBOutlet weak var costCell: UILabel!
@IBOutlet weak var routeCell: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
我真的希望有人能意识到这个问题,如果您需要更多信息或屏幕截图,请告诉我:)
再次感谢您的帮助和时间:)
您没有将表视图委托设置为self,这就是它发生的原因。 在ViewController中添加TableView:
tableView.registerNib(UINib(nibName: "nameOfTheNib", bundle: nil), forCellReuseIdentifier: "reuseIdentifier")
示例tableView.registerNib(UINib(nibName: "nameOfTheNib", bundle: nil), forCellReuseIdentifier: "reuseIdentifier")
cellForRowAtIndexPath
,使用"reuseIdentifier"
创建该单元格 您需要在cellForRowAtIndexPath
添加此代码
if cell == nil {
cell = MyCell(style: UITableViewCellStyle.Default, reuseIdentifier: kCellIdentifier)
}
所以你的方法是-
internal func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: CellHistoryViewControllerTableViewCell = tableView.dequeueReusableCell(withIdentifier: "CellHistory", for: indexPath) as! CellHistoryViewControllerTableViewCell
if cell == nil {
cell = CellHistoryViewControllerTableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "CellHistory")
}
cell.durationCell.text = zeit[indexPath.row]
cell.costCell.text = kosten[indexPath.row]
cell.routeCell.text = kilometer[indexPath.row]
cell.dateCell.text = datum[indexPath.row]
return cell
}
也像这样注册您xib:-
override func viewDidLoad() {
super.viewDidLoad()
tableView.registerNib(UINib(nibName: "CellHistoryViewControllerTableViewCell", bundle: nil), forCellReuseIdentifier: "CellHistory")
}
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