The crash of IBOutlet

Question

I wrote a custom view by xib in swift. The view shows correct and the @IBAction is also right. But when I add an @IBOutlet, the app will crash.

The error message is:

2016-03-15 22:32:16.650 ****[42692:1015001] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSObject 0x7f8ea483cd30> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key cancelBtn.'

And the xib:

And the code is:

 class PYChangeNameView: UIView { 
  var confirmAction: ((name: String?) -> ())? 
  var cancelAction: (() -> ())? 

  @IBOutlet weak var cancelBtn: UIButton! 

  private init() { 
   super.init(frame: CGRectZero) 
   if let view = UIView.loadFromNibNamed("PYChangeNameView") {    
    view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight] 
    self.frame = UIScreen.mainScreen().bounds self.addSubview(view) 
   } 
  }

  @IBAction func cancelClick(sender: AnyObject) {
    PYCNVStaticValues.sharedInstance?.removeFromSuperview()
    PYCNVStaticValues.cancelAction?()
  }
}

The @IBAction works, but the @IBOutlet does not work. }

Is the button actually named "cancelBtn" in the xib? Based on the action name and the error message, I would guess it is named "cancel". — Wayne Tanner, Mar 15 '16 at 14:47
Have you added an IBOutlet to this button in any other place? — Hugo Alonso, Mar 15 '16 at 14:58
@HugoAlonso No, I had search the key "cancelBtn" in the project, only this place. — Pluto Y, Mar 15 '16 at 15:00
try and remove the IBOutlet from the inspector in this xib, rebuild, launch, if everything is OK, then set it back — Hugo Alonso, Mar 15 '16 at 15:05
So, if you remove the IBOutlet from the inspector it keeps giving you the error? — Hugo Alonso, Mar 15 '16 at 15:09
Isn't it funny that is says `NSObject...setValue:forUndefinedKey:` instead of for instance `UIViewController...setValue:forUndefinedKey:`. What does your files owner look like? — pbodsk, Mar 15 '16 at 15:10
@HugoAlonso If i remove the `@IBOutlet`, it run right. But if I add `@IBOutlet`, it crashed. — Pluto Y, Mar 15 '16 at 15:20
@pbodsk ```class PYChangeNameView: UIView { var confirmAction: ((name: String?) -> ())? var cancelAction: (() -> ())? @IBOutlet weak var cancelBtn: UIButton! private init() { super.init(frame: CGRectZero) if let view = UIView.loadFromNibNamed("PYChangeNameView") { view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight] self.frame = UIScreen.mainScreen().bounds self.addSubview(view) } } — Pluto Y, Mar 15 '16 at 15:20
@pbodsk This is the content, It's a subclass of the `UIView`. — Pluto Y, Mar 15 '16 at 15:21
Try this approach and see if it works for you http://stackoverflow.com/a/24370563/2683201 — Hugo Alonso, Mar 15 '16 at 15:54

score 3 · Answer 1 · edited May 23 '17 at 12:33

3

Take a look at the error: it's telling you that NSObject doesn't have a cancelBtn field. And why would it?

Looking at your screenshot, I can see that you have the cancelBtn outlet set on your File's Owner. (The outlet should be set to whatever is your custom view.)

Therefore I can conclude that your File's Owner object isn't getting properly associated with your PYChangeNameView, and the runtime thinks it's simply an NSObject. I believe you need to set that class as the type in your XIB - probably in the controls at right.

Check out this beautiful Retina-quality screenshot that I captured:

There may also be a need to set the Module field. You may get some insight from this answer.

edited May 23 '17 at 12:33

Community

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answered Mar 15 '16 at 15:40

QED

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I think you're right, I was (slowly) getting to the same conclusion, just needed to be sure :-) – pbodsk Mar 15 '16 at 15:43
@QED How can i get propertly associated with the PYChangeNameView? – Pluto Y Mar 15 '16 at 15:50
@PlutoY I added a beautiful Retina-quality screenshot to show you how. – QED Mar 15 '16 at 15:54
@QED Is it the file owner right? If it is, I had set it. – Pluto Y Mar 15 '16 at 16:01
@PlutoY it should be whatever is the custom view. – QED Mar 15 '16 at 16:31

score 0 · Answer 2 · answered Mar 15 '16 at 15:45

0

check to make sure that your view's xib is a PYChangeNameView

answered Mar 15 '16 at 15:45

Dan Leonard

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And that were it says **Module**, actually there's something different than **None** – Hugo Alonso Mar 15 '16 at 15:50
ya your module should be your project name. not "none" – Dan Leonard Mar 15 '16 at 16:01
You also may just try deleting your outlet connection and control drag it back. – Dan Leonard Mar 15 '16 at 16:02
@DanielLeonard Yes, this is the way which I created the oulet. And the `module` is also my project name. – Pluto Y Mar 15 '16 at 16:05

The crash of IBOutlet

2 Answers2