Getting error while using NSBundle? - ios

Question

I used path to documents to link external file in app. But when I want to run the project on real iPhone, I replaced the path with NSBundle. Now I'm getting error because of NSBundle(I think) or something else. How can I debug it?
error in console: fatal error: unexpectedly found nil while unwrapping an Optional value
the whole code:
import UIKit
func assign() -> [String]{
let bundle = NSBundle.mainBundle()
let path = bundle.pathForResource("words", ofType: "txt")
let content = String(contentsOfFile: path!, encoding: NSUTF8StringEncoding, error: nil)//xcode marked that line with green
let newArray = content!.componentsSeparatedByString("\n")
return newArray
}
class ViewController: UIViewController, UITextFieldDelegate {
let newArray: [String] = assign()
#IBOutlet weak var textBox: UITextView!
#IBOutlet weak var firstInput: UITextField!
#IBOutlet weak var resultLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
firstInput.returnKeyType = .Search
firstInput.delegate = self
textBox.text = ""
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func getFromPath() {
//getFromPath() func used to be in assign func.
var letters = firstInput.text
var res = search(set: newArray, letters: letters)
textBox.text! = ""
for element in res {
textBox.text = (textBox.text ?? "") + "\n" + "\(element)"
}
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
if firstInput.text == "" {
}
else {
getFromPath()
}
self.view.endEditing(true)
return false
}
func search(#set: [String], letters: String) -> [String] {
let result = filter(set) { item in
for char in letters {
if !contains(item, char) {
return false
}
}
return true
}
return result
}
}

Answer 1

It seems like you dont have that file in your bundle.
Make sure the file has been added to the target, check in the inspector.
Wrap critical initialization in
if let someObject = source as? someType
{
}

Answer 2

Drag your file to your project and place it together with your projects files. Make sure you select copy items if needed:
class ViewController: UIViewController {
let wordsUrl = NSBundle.mainBundle().URLForResource("words", withExtension: "txt")!
override func viewDidLoad() {
super.viewDidLoad()
var error: NSError?
if wordsUrl.checkResourceIsReachableAndReturnError(&error) {
println(true)
if let myString = String(contentsOfURL: wordsUrl, encoding: NSUTF8StringEncoding, error: &error) {
let myArray = myString.componentsSeparatedByString("\n")
println(myArray)
} else if let error = error {
println(error.description)
}
} else if let error = error {
println(error.description)
}
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}