title: Swift 3 viewDidLoad() - Fatal error: unexpectedly found nil while unwrapping an Optional value
body: <p>I've tried all the previous suggestions here for fixing this problem, but still have had no luck.  It was working (UIPickerView was correctly populating), but now the app crashes after viewDidLoad() runs.  Verified all IBOutlets are correctly connected.  Tried re-creating the cocoa touch file.</p>
  
  <p>Here is my view controller code.  It's gotta be something minor I'm overlooking.  Help!!</p>
  
  <pre><code>class SettingsVC: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
  
  @IBOutlet weak var targetCadenceLabel: UILabel?
  @IBOutlet weak var cadenceStepper: UIStepper?
  @IBOutlet weak var goalPicker: UIPickerView?
  
  var pickerDataSource = ["improve SPM", "maintain SPM"]
  
  override func viewDidLoad() {
      super.viewDidLoad()
      self.goalPicker?.dataSource = self
      self.goalPicker?.delegate = self
  
  
      //MARK:  Setup Tab Bar
      let tabBarItem = self.tabBarItem
      let incomingSelectedImage: UIImage! = UIImage(named: "settings_icon")?.withRenderingMode(.alwaysOriginal)
      tabBarItem?.selectedImage = incomingSelectedImage
      tabBarItem?.setTitleTextAttributes([NSForegroundColorAttributeName : UIColor(red: 60/255, green: 159/255, blue: 255/255, alpha: 1.0)], for: UIControlState.selected)
  }
  
  
  //MARK: - Delegates and data sources
  //MARK: Data Sources
  func numberOfComponents(in pickerView: UIPickerView) -&gt; Int {
      return 1
  }
  
  func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -&gt; Int {
      return pickerDataSource.count
  }
  
  //MARK: Delegates
  func pickerView(_ pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -&gt; NSAttributedString? {
      let titleData = pickerDataSource[row]
      let myFont = UIFont.systemFont(ofSize: 18)
      let fontColor = UIColor(red: 60/255, green: 159/255, blue: 255/255, alpha: 1.0)
      let myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName: myFont,NSForegroundColorAttributeName:fontColor])
      return myTitle
  }
  
  func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
  
  }
  
  @IBAction func cadenceStepper(_ sender: UIStepper) {
      targetCadenceLabel?.text = Int(sender.value).description
  }
  
  @IBAction func goPremiumTapped(_ sender: UIButton) {
      print("Go Premium Button Tapped")
  }    
  }
  </code></pre>