UITableView populated but not displaying data or rows - ios

Question

I know this particular question has been asked and answered previously in SO but cross checked those answers and still not able to fix this issue. Can be a silly mistake but unable to nail it.
Cross checked :
Cell Identifierid
datasource and delegate added through Interface builder
Code :
var sensorFields = [Sensor]()
override func viewDidLoad() {
super.viewDidLoad()
readParseDataFromCSV(file: "csvFile")
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
print(self.sensorFields.count)// has count 120
return self.sensorFields.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "SensorTableCell") as! SensorTableViewCell
cell.lblSensorName.text = sensorFields[indexPath.row].labelName
cell.lblSensorValue.text = sensorFields[indexPath.row].labelValue
print(sensorFields[indexPath.row].labelName) // doesn't seem to enter to this code block
print(sensorFields[indexPath.row].labelValue)
return cell
}
func readParseDataFromCSV(file:String){
let filepath = Bundle.main.path(forResource: file, ofType: "csv")!
do {
let csv = try CSV(contentsOfURL: filepath)
let rows = csv.rows
for row in rows{
let sensorlblName = row["data column 1"]
let sensorlblValue = row["data column 2"]
let sensor = Sensor(labelName: sensorlblName!, labelValue: sensorlblValue!)
sensorFields.append(sensor)
}
} catch {
print(error.localizedDescription)
}
}
class SensorTableViewCell: UITableViewCell {
#IBOutlet weak var lblSensorName: UILabel!
#IBOutlet weak var lblSensorValue: 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
}
}
Is there anything missed out , using other tableviews in the app already which is working perfectly apart from this one.
Using Xcode 8.1 and Swift 3.0
Edit :
Added reloadData()
Seems like
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {}
is not firing too.
Please help.
Thanks in advance.

Answer 1

Just appending data to your sensorFields array has no impact on the cells displayed in your tableView.
You need to call reloadData on the tableView so it knows the data did change and repopulates the cells with the new data.
for row in rows {
let sensorlblName = row["data column 1"]
let sensorlblValue = row["data column 2"]
let sensor = Sensor(labelName: sensorlblName!, labelValue: sensorlblValue!)
sensorFields.append(sensor)
}
tableView.reloadData()
I would also prefer
// newer dequeue method guarantees a cell is returned and resized properly, assuming identifier is registered
// Swift 2
func dequeueReusableCellWithIdentifier(identifier: String, forIndexPath indexPath: NSIndexPath) -> UITableViewCell
// Swift 3
func dequeueReusableCell(withIdentifier identifier: String, for indexPath: IndexPath) -> UITableViewCell
to
// Used by the delegate to acquire an already allocated cell, in lieu of allocating a new one.
// Swift 2
func dequeueReusableCellWithIdentifier(identifier: String) -> UITableViewCell?
// Swift 3
func dequeueReusableCell(withIdentifier identifier: String) -> UITableViewCell?
because dequeueReusableCellWithIdentifier(identifier: String) does not guarantee returning a UITableViewCell when the cell with identifier was not yet allocated. ("[...] acquire an already allocated cell, in lieu of allocating a new one.")
And make sure your IBOutlets are connected! (lblSensorName and lblSensorValue)

Answer 2

check this
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
var cell = tableView.dequeueReusableCellWithIdentifier("SensorTableCell") as UITableViewCell!
if !cell {
cell = UITableViewCell(style:.Default, reuseIdentifier: "SensorTableCell")
}
}