found nil while trying to segue away from a tableView - ios

Question

I'm getting errors whenever I try to reference the viewTable in the viewDidLoad AFTER I click on a cell to transition with the segue. Thanks a lot!!
Basically I can't use the segue unless I comment out the tableview references in view did load... but I need those in order to use the search bar and im sure it will cause problems on the way back...
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet var tableView: UITableView! {
didSet {
print("tableView is set")
}
}
let searchController = UISearchController(searchResultsController: nil)
let textCellIdentifier = "TextCell"
var buildings: [(String,String)] = []
var filteredBuildings = [(String,String)]()
var goToIndex: Int?
override func viewDidLoad() {
super.viewDidLoad()
print(tableView)
var buildingTuples = loadBuildings()
for tuple in buildingTuples {
self.buildings.append(tuple)
}
self.goToIndex = -1
searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
definesPresentationContext = true
tableView!.tableHeaderView = searchController.searchBar
}
func filterContentForSearchText(searchText: String, scope: String = "All") {
filteredBuildings = buildings.filter { building in
return building.0.lowercaseString.containsString(searchText.lowercaseString)
}
self.tableView.reloadData()
}
// MARK: UITextFieldDelegate Methods
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//return self.buildings.count
if searchController.active && searchController.searchBar.text != "" {
return filteredBuildings.count
}
return buildings.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
/*
let cell = tableView.dequeueReusableCellWithIdentifier(textCellIdentifier, forIndexPath: indexPath)
let row = indexPath.row
cell.textLabel?.text = buildings[row].0
return cell
*/
let cell = tableView.dequeueReusableCellWithIdentifier(textCellIdentifier, forIndexPath: indexPath)
let tuple: (String, String)
if searchController.active && searchController.searchBar.text != "" {
tuple = filteredBuildings[indexPath.row]
} else {
tuple = buildings[indexPath.row]
}
cell.textLabel?.text = tuple.0
return cell
}
// MARK: UITableViewDelegate Methods
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
//tableView.deselectRowAtIndexPath(indexPath, animated: true)
let row = indexPath.row
self.goToIndex = indexPath.row
self.performSegueWithIdentifier("MainToLocation", sender: self)
//print(buildings[row].0)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "MainToLocation" {
let locationViewController = (segue.destinationViewController as! LocationViewController)
locationViewController.building = self.buildings[self.goToIndex!]
}
}
extension ViewController: UISearchResultsUpdating {
func updateSearchResultsForSearchController(searchController: UISearchController) {
filterContentForSearchText(searchController.searchBar.text!)
}
}

Answer 1

You can try this..
let destinationVC = self.storyboard!.instantiateViewControllerWithIdentifier("viewController") as! NextViewController
var alreadyPushed = false
if let vc = self.navigationController?.viewControllers {
for viewController in vc {
if let viewController = viewController as? NextViewController {
self.navigationController?.popToViewController(viewController, animated: true)
print("Push your controller")
alreadyPushed = true
break
}
}
}
if alreadyPushed == false {
self.navigationController?.pushViewController(destinationVC, animated: true)
}