unexpectedly found nil while unwrapping an Optional value in Base ViewController - ios

Question

I'm Using pagemenu project https://github.com/uacaps/PageMenu to include in my app the segmented control to switch between view controllers,this control consists in one base view controller(PageMenuViewController1) and two child view controllers (ViewController1, ViewController2) but when I launch this PageMenuViewController1 the app fails in the child view controllers(below I show exactly where the app fails) and throws this error:
fatal error: unexpectedly found nil while unwrapping an Optional value
below you can see the code for the viewcontrollers.
The base View Controller is:
class PageMenuViewController1: UIViewController {
var pageMenu : CAPSPageMenu?
override func viewDidLoad() {
// Array to keep track of controllers in page menu
var controllerArray : [UIViewController] = []
// Create variables for all view controllers you want to put in the
// page menu, initialize them, and add each to the controller array.
// (Can be any UIViewController subclass)
// Make sure the title property of all view controllers is set
// Example:
var controller1 : ViewController1 = ViewController1()
controller1.title = "ViewController1"
controllerArray.append(controller1)
var controller2 : ViewController2 = ViewController2()
controller2.title = "ViewController2"
controllerArray.append(controller2)
// Customize page menu to your liking (optional) or use default settings by sending nil for 'options' in the init
// Example:
var parameters: [CAPSPageMenuOption] = [
.MenuItemSeparatorWidth(4.3),
.UseMenuLikeSegmentedControl(true),
.MenuItemSeparatorPercentageHeight(0.1)
]
// Initialize page menu with controller array, frame, and optional parameters
pageMenu = CAPSPageMenu(viewControllers: controllerArray, frame: CGRectMake(0.0, 0.0, self.view.frame.width, self.view.frame.height), pageMenuOptions: parameters)
// Lastly add page menu as subview of base view controller view
// or use pageMenu controller in you view hierachy as desired
self.view.addSubview(pageMenu!.view)
}
}
the Child View Controllers:
-- ViewController1
class ViewController1: UIViewController, UITableViewDataSource{
#IBOutlet var tableview:UITableView!
let apiClient = ApiClient()
var clubs: [Club]!
override func viewDidLoad() {
super.viewDidLoad()
apiClient.Service.getList() { clubs, error in
if clubs != nil {
self.clubs = clubs
self.tableview.reloadData()// Here is where the lldb throws the exception
}
else {
println("error: \(error)")
}
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.clubs?.count ?? 0
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) ->UITableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier("clubObjectCell") as! ClubTableViewCell
cell.clubObject = self.clubs?[indexPath.row]
return cell
}
}
-- ViewController2
class ViewController2: UIViewController, UITableViewDataSource {
#IBOutlet var tableview:UITableView!
let apiClient = ApiClient()
var parties: [Party]? = []
override func viewDidLoad() {
super.viewDidLoad()
apiClient.partiesService.getList() { parties, error in
if parties != nil {
self.parties = parties
self.tableview.reloadData()// Here is where the lldb throws the exception
}
else {
println("error: \(error)")
}
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.parties?.count ?? 0
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier("partyObjectCell") as! PartyTableViewCell
cell.partyObject = self.parties?[indexPath.row]
return cell
}
}
I hope my issue it's clear :)

Answer 1

Most likely, you forgot to connect the tableView IBOutlet property to a view in your storyboard. In the gutter, to the left of the line of code that says #IBOutlet var tableview: UITableView!, you should see a circle. If the circle is filled, then the outlet is already connected. But if the circle is empty, you need to connect it.
This connection can be made in a few different ways. A common method is to use the Assistant Editor. Open ViewController1.swift on one pane, and open Main.storyboard on the other pane. Select the appropriate UITableView in the Storyboard. Then, control-drag to the empty circle near the IBoutlet in ViewController1.
If your outlet is already connected (you can see a full circle), then you should try moving the reloadData() call to viewWillAppear(:) like so:
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
apiClient.Service.getList() { clubs, error in
if clubs != nil {
self.clubs = clubs
self.tableview.reloadData()// Here is where the lldb throws the exception
}
else {
println("error: \(error)")
}
}
}

Answer 2

I think the way you are instantiating ViewController1 and ViewController2 is not correct.
If you are using storyboard then you must instantiate as follows:
var controller1 : ViewController1 = storyboard.instantiateViewControllerWithIdentifier("<view controller 1 identifier in storyboard>")
If you are not using storyboard then you must instantiate using NSBundle.mainModule().loadNibNamed(...).
Just calling the class initializer will not attach them to the storyboard or xib.