Error when trying to reload data in UITableView in Swift - ios

Question

Still not solved!
I have been stuck with this problem way too long, so i hope you can help.
I Have two UITableViews side-by-side in one view in Storyboard. Each in a ContainerView to control their positions.
The idea is, if you touch a row in the first UITableView. The data from that row should be added to the second UITableView.
In TableOne i'm calling the function addDataToTableView() in didSelectRowAtIndexPath.
In Tabletwo addDataToTableView() get's the touched element and add it to the testData2 array. This works fine. The print() function spits out the right element.
But then on self.tableTwo.reloadData() the application crash with this error message:
fatal error: unexpectedly found nil while unwrapping an Optional value
I’m not entirely sure what causes the Error, but i think it’s either that i don’t get the right instance of the class, created by the storyboard or it’s something with optimals.
i tried putting in some ??? and som !!! and i have tried wrapping .reloaddata() ind another thread. but it didn’t help.
This is the entire code.
Hope you can help :)
TableOne
class TableOne: UITableViewController {
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
var tableTwo = TableTwo()
var testData = ["test1","test2", "test3", "test4", "test5", "test6"]
override func viewDidLoad() {
super.viewDidLoad()
tableTwo = mainStoryboard.instantiateViewControllerWithIdentifier("tableTwoId") as! TableTwo
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return testData.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = UITableViewCell()
cell.textLabel?.text = testData[indexPath.row]
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableTwo.addDataToTableView(testData[indexPath.row])
}
}
TableTwo
class TableTwo: UITableViewController {
#IBOutlet var tableTwo: UITableView!
var testData2 = ["Test"]
func addDataToTableView(data: AnyObject) {
testData2.append(data as! String)
print("This works fine \(testData2[testData2.count-1] )")
self.tableTwo.reloadData()
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return testData2.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = UITableViewCell()
cell.textLabel?.text = testData2[indexPath.row]
return cell
}
}

Answer 1

If you want to send data from One TableViewController either use prepareForSegue or didSelectRowAtIndexPath.
This line let cell = UITableViewCell() you only declare an instance of a UITableViewCell by you never called the method which makes that cell reusable in the queue.
class TableOne: UITableViewController
{
var testData = [String]()
override func viewDidLoad()
{
super.viewDidLoad()
testData = ["test1","test2", "test3", "test4", "test5", "test6"]
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return testData.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCellWithIdentifier("CellIdentifier", forIndexPath: indexPath)
cell.textLabel?.text = testData[indexPath.row]
return cell
}
"CellIdentifier" is the name of the cell identifier from the tableView cell prototype into the storyboard
To send Data the TableView lets say we are using prepareForSegue and you must know that When the user selected one cell only that cell information will be sent to your next ViewController.
if segue.identifier == "NAME_OF_THE_SEGUE_IDENTIFIER"
{
let destination = segue.destinationViewController as("nameOftheTableView")
let indexPath = mytableview.indexPathForSelectedRow!
var dataToTransfer = testData[indexPath.row]
// let's say you have a string variable into your next ViewContrller called receiver
destination.receiver = dataToTransfer //<-- from the selectRow we assign that value into our next Controller.
}
So Build up on that to fix your code :)