setValue forUndefinedKey this class is not key value coding-compliant for the key

Question

I m creating a login to view support tickets  The first view is the ticket view  and if you re not logged in pushes you to the login screen  However I receive this      Support 3209 18e03    Terminating app due to uncaught exception  NSUnknownKeyException   reason     setValue forUndefinedKey    this class is not key value coding-compliant for the key LoginScreen          First throw call stack     0x1f17012 0x1634e7e 0x1f9ffb1 0x10e1711 0x1062ec8 0x10629b7 0x108d428 0x7990cc 0x1648663 0x1f1245a 0x797bcf 0x65ce37 0x65d418 0x65d648 0x65d882 0x669235 0x8683d2 0x6664f3 0x666777 0x6667b7 0x9d1fe2 0x9c3ad9 0x65e422 0x2b15 0x65f753 0x65fb2f 0x661286 0x65fe3f 0x592910 0x592895 0x5926e5 0x1edfafe 0x1edfa3d 0x1ebd7c2 0x1ebcf44 0x1ebce1b 0x22aa7e3 0x22aa668 0x57c65c 0x1f0d 0x1e35    libc  abi dylib  terminate called throwing an exception   Here is my code for LoginScreen m   import  UIAlertView error h   import  LoginScreen h   import  API h   include  lt CommonCrypto CommonDigest h gt    define sayWhat   REMOVEDFORSECURITY     implementation LoginScreen  - void viewDidLoad       NSLog   Found me          super viewDidLoad           focus on the username field  show keyboard      fldUsername becomeFirstResponder       -  BOOL shouldAutorotateToInterfaceOrientation  UIInterfaceOrientation interfaceOrientation              Return YES for supported orientations         return  interfaceOrientation    UIInterfaceOrientationPortrait              - IBA  ction btnLoginRegisterTapped  UIButton  sender       if  fldUsername text length  lt  4    fldPassword text length  lt  4            UIAlertView error   Enter username and password over 4 chars each             return               very basic encryption called  salting      NSString  saltedPassword    NSString stringWithFormat          fldPassword text  sayWhat          prep the hashed storage     NSString  hashedPassword   nil      unsigned char hashedPasswordData CC SHA1 DIGEST LENGTH          actually hash this     NSData  data    saltedPassword dataUsingEncoding  NSUTF8StringEncoding       if  CC SHA1  data bytes    data length   hashedPasswordData            hashedPassword     NSString alloc  initWithBytes hashedPasswordData length sizeof hashedPasswordData  encoding NSASCIIStringEncoding             else                UIAlertView error   Password can t be sent                    return                 NSMutableDictionary  params    NSMutableDictionary dictionaryWithObjectsAndKeys          fldUsername text    username                                      hashedPassword    password   nil         here is the web call finally        API sharedInstance  commandWithParams params                                onCompletion   NSDictionary  json             returned result        NSDictionary  res     json objectForKey   result   objectAtIndex 0            if  json objectForKey   error    nil  amp  amp    res objectForKey   userid   intValue  gt  0                                             success           else                                            error           UIAlertView error  json objectForKey   error                                                        end   and LoginScreen h   import  lt UIKit UIKit h gt    interface LoginScreen   UIViewController     the login form fields IBOutlet UITextField  fldUsername  IBOutlet UITextField  fldPassword        action for when either button is pressed - IBAction btnLoginRegisterTapped  id sender    end        lt  xml version  1 0  encoding  UTF-8  standalone  no   gt   lt document type  com apple InterfaceBuilder3 CocoaTouch Storyboard XIB  version  2 0  toolsVersion  2844  systemVersion  12C60  targetRuntime  iOS CocoaTouch  propertyAccessControl  none  useAutolayout  YES  initialViewController  A8c-eR-geg  gt       lt dependencies gt           lt plugIn identifier  com apple InterfaceBuilder IBCocoaTouchPlugin  version  1930   gt       lt  dependencies gt       lt scenes gt           lt  --Tickets View - View Tickets-- gt           lt scene sceneID  aIJ-Wx-2Yy  gt               lt objects gt                   lt viewController title  View Tickets  id  T0P-Bi-31w  customClass  TicketsView  sceneMemberID  viewController  gt                       lt view key  view  contentMode  scaleToFill  id  4zZ-I2-ltX  gt                           lt rect key  frame  x  0 0  y  64  width  320  height  504   gt                           lt autoresizingMask key  autoresizingMask  flexibleMaxX  YES  flexibleMaxY  YES   gt                           lt subviews gt                               lt label opaque  NO  clipsSubviews  YES  userInteractionEnabled  NO  contentMode  left  text  You Made It  lineBreakMode  tailTruncation  baselineAdjustment  alignBaselines  adjustsFontSizeToFit  NO  translatesAutoresizingMaskIntoConstraints  NO  id  Fbu-Sr-Mgf  gt                                   lt fontDescription key  fontDescription  type  system  pointSize  17   gt                                   lt color key  textColor  cocoaTouchSystemColor  darkTextColor   gt                                   lt nil key  highlightedColor   gt                               lt  label gt                           lt  subviews gt                           lt color key  backgroundColor  white  1  alpha  1  colorSpace  custom  customColorSpace  calibratedWhite   gt                           lt constraints gt                               lt constraint firstItem  Fbu-Sr-Mgf  firstAttribute  top  secondItem  4zZ-I2-ltX  secondAttribute  top  constant  138  id  QBp-qM-fKP   gt                               lt constraint firstItem  Fbu-Sr-Mgf  firstAttribute  leading  secondItem  4zZ-I2-ltX  secondAttribute  leading  constant  115  id  goO-5h-RZK   gt                           lt  constraints gt                       lt  view gt                       lt navigationItem key  navigationItem  id  vu4-JX-C3v   gt                       lt simulatedNavigationBarMetrics key  simulatedTopBarMetrics  prompted  NO   gt                       lt connections gt                           lt segue destination  TOB-FA-Ss4  kind  modal  identifier  ShowLogin  id  dJH-ge-8CV   gt                       lt  connections gt                   lt  viewController gt                   lt placeholder placeholderIdentifier  IBFirstResponder  id  aSa-2G-5fx  userLabel  First Responder  sceneMemberID  firstResponder   gt               lt  objects gt               lt point key  canvasLocation  x  -518  y  -841   gt           lt  scene gt           lt  --Login Screen - Login-- gt           lt scene sceneID  6iZ-QL-7ID  gt               lt objects gt                   lt viewController title  Login  id  TOB-FA-Ss4  customClass  LoginScreen  sceneMemberID  viewController  gt                       lt view key  view  contentMode  scaleToFill  id  w9e-4U-cwC  gt                           lt rect key  frame  x  0 0  y  64  width  320  height  504   gt                           lt autoresizingMask key  autoresizingMask  flexibleMaxX  YES  flexibleMaxY  YES   gt                           lt subviews gt                               lt label opaque  NO  clipsSubviews  YES  userInteractionEnabled  NO  contentMode  left  text  Blue Label Hosting Login  lineBreakMode  tailTruncation  minimumFontSize  10  translatesAutoresizingMaskIntoConstraints  NO  id  SuD-JI-L2T  gt                                   lt fontDescription key  fontDescription  type  system  pointSize  17   gt                                   lt color key  textColor  cocoaTouchSystemColor  darkTextColor   gt                                   lt nil key  highlightedColor   gt                               lt  label gt                               lt textField opaque  NO  clipsSubviews  YES  contentMode  scaleToFill  contentHorizontalAlignment  left  contentVerticalAlignment  center  borderStyle  roundedRect  placeholder  Username  minimumFontSize  17  translatesAutoresizingMaskIntoConstraints  NO  id  NeI-zB-U8Y  gt                                   lt constraints gt                                       lt constraint firstAttribute  height  constant  31  id  BlH-cG-Jdh   gt                                       lt constraint firstAttribute  width  constant  208  id  Osb-tj-fjn   gt                                   lt  constraints gt                                   lt fontDescription key  fontDescription  type  system  pointSize  14   gt                                   lt textInputTraits key  textInputTraits   gt                               lt  textField gt                               lt textField opaque  NO  clipsSubviews  YES  contentMode  scaleToFill  contentHorizontalAlignment  left  contentVerticalAlignment  center  borderStyle  roundedRect  placeholder  Password  minimumFontSize  17  translatesAutoresizingMaskIntoConstraints  NO  id  4Fi-NX-kli  gt                                   lt constraints gt                                       lt constraint firstAttribute  height  constant  31  id  X3j-X2-ton   gt                                   lt  constraints gt                                   lt fontDescription key  fontDescription  type  system  pointSize  14   gt                                   lt textInputTraits key  textInputTraits  secureTextEntry  YES   gt                               lt  textField gt                               lt button opaque  NO  contentMode  scaleToFill  contentHorizontalAlignment  center  contentVerticalAlignment  center  buttonType  roundedRect  lineBreakMode  middleTruncation  translatesAutoresizingMaskIntoConstraints  NO  id  5o5-83-KbW  gt                                   lt constraints gt                                       lt constraint firstAttribute  height  constant  36  id  Afu-6h-uru   gt                                       lt constraint firstAttribute  width  constant  161  id  Ef5-df-Jmp   gt                                   lt  constraints gt                                   lt fontDescription key  fontDescription  type  boldSystem  pointSize  15   gt                                   lt state key  normal  title  Login  gt                                       lt color key  titleColor  red  0 19607843459999999  green  0 30980393290000002  blue  0 52156865600000002  alpha  1  colorSpace  calibratedRGB   gt                                       lt color key  titleShadowColor  white  0 5  alpha  1  colorSpace  calibratedWhite   gt                                   lt  state gt                                   lt state key  highlighted  gt                                       lt color key  titleColor  white  1  alpha  1  colorSpace  calibratedWhite   gt                                   lt  state gt                                   lt connections gt                                       lt action selector  btnLoginRegisterTapped   destination  w9e-4U-cwC  eventType  touchUpInside  id  Wgb-L8-sAJ   gt                                   lt  connections gt                               lt  button gt                           lt  subviews gt                           lt color key  backgroundColor  cocoaTouchSystemColor  groupTableViewBackgroundColor   gt                           lt constraints gt                               lt constraint firstItem  NeI-zB-U8Y  firstAttribute  top  secondItem  SuD-JI-L2T  secondAttribute  bottom  constant  8  symbolic  YES  type  default  id  0Pv-zM-WId   gt                               lt constraint firstItem  4Fi-NX-kli  firstAttribute  top  secondItem  NeI-zB-U8Y  secondAttribute  bottom  constant  8  symbolic  YES  type  default  id  2Sw-m8-LND   gt                               lt constraint firstItem  4Fi-NX-kli  firstAttribute  trailing  secondItem  NeI-zB-U8Y  secondAttribute  trailing  type  default  id  88O-VQ-qut   gt                               lt constraint firstItem  SuD-JI-L2T  firstAttribute  centerX  secondItem  NeI-zB-U8Y  secondAttribute  centerX  type  default  id  Qu9-PG-YWz   gt                               lt constraint firstItem  4Fi-NX-kli  firstAttribute  centerX  secondItem  5o5-83-KbW  secondAttribute  centerX  type  default  id  RAm-sI-Z3u   gt                               lt constraint firstItem  5o5-83-KbW  firstAttribute  top  secondItem  w9e-4U-cwC  secondAttribute  top  constant  128  id  UTG-NS-bx4   gt                               lt constraint firstItem  SuD-JI-L2T  firstAttribute  top  secondItem  w9e-4U-cwC  secondAttribute  top  constant  20  symbolic  YES  type  default  id  iaC-Ex-EBa   gt                               lt constraint firstItem  SuD-JI-L2T  firstAttribute  centerX  secondItem  w9e-4U-cwC  secondAttribute  centerX  type  default  id  oWP-Gp-Pi5   gt                               lt constraint firstItem  4Fi-NX-kli  firstAttribute  leading  secondItem  NeI-zB-U8Y  secondAttribute  leading  type  default  id  oxE-WD-fVc   gt                           lt  constraints gt                           lt connections gt                               lt outlet property  fldPassword  destination  4Fi-NX-kli  id  4eb-YW-8YI   gt                               lt outlet property  fldUsername  destination  NeI-zB-U8Y  id  Ds4-XS-iqW   gt                           lt  connections gt                       lt  view gt                       lt simulatedNavigationBarMetrics key  simulatedTopBarMetrics  prompted  NO   gt                   lt  viewController gt                   lt placeholder placeholderIdentifier  IBFirstResponder  id  FL3-Yk-JbH  userLabel  First Responder  sceneMemberID  firstResponder   gt               lt  objects gt               lt point key  canvasLocation  x  -84  y  -349   gt           lt  scene gt           lt  --Navigation Controller-- gt           lt scene sceneID  fJ6-wq-4Tj  gt               lt objects gt                   lt navigationController id  A8c-eR-geg  sceneMemberID  viewController  gt                       lt toolbarItems  gt                       lt navigationBar key  navigationBar  opaque  NO  clipsSubviews  YES  multipleTouchEnabled  YES  contentMode  scaleToFill  id  bnk-dD-E4j  gt                           lt rect key  frame  x  0 0  y  0 0  width  320  height  44   gt                           lt autoresizingMask key  autoresizingMask   gt                       lt  navigationBar gt                       lt nil name  viewControllers   gt                       lt connections gt                           lt segue destination  T0P-Bi-31w  kind  relationship  relationship  rootViewController  id  3jA-WY-c3V   gt                       lt  connections gt                   lt  navigationController gt                   lt placeholder placeholderIdentifier  IBFirstResponder  id  lTO-TW-owb  userLabel  First Responder  sceneMemberID  firstResponder   gt               lt  objects gt               lt point key  canvasLocation  x  -971  y  -910   gt           lt  scene gt       lt  scenes gt       lt classes gt           lt class className  LoginScreen  superclassName  UIViewController  gt               lt source key  sourceIdentifier  type  project  relativePath    Classes LoginScreen h   gt               lt relationships gt                   lt relationship kind  action  name  btnLoginRegisterTapped    gt                   lt relationship kind  outlet  name  fldPassword  candidateClass  UITextField   gt                   lt relationship kind  outlet  name  fldUsername  candidateClass  UITextField   gt               lt  relationships gt           lt  class gt           lt class className  NSLayoutConstraint  superclassName  NSObject  gt               lt source key  sourceIdentifier  type  project  relativePath    Classes NSLayoutConstraint h   gt           lt  class gt           lt class className  TicketsView  superclassName  UIViewController  gt               lt source key  sourceIdentifier  type  project  relativePath    Classes TicketsView h   gt           lt  class gt       lt  classes gt       lt simulatedMetricsContainer key  defaultSimulatedMetrics  gt           lt simulatedStatusBarMetrics key  statusBar   gt           lt simulatedOrientationMetrics key  orientation   gt           lt simulatedScreenMetrics key  destination  type  retina4   gt       lt  simulatedMetricsContainer gt   lt  document gt

User · Accepted Answer

Such inexplicable exceptions are often a result of an unclean xib file   Open the xib in xcode  select File s Owner and click on the  Connection Inspector   upper right arrow   to see all outlets at once  Look for  s which indicates a missing outlet

User · Answer

This error is something else     Here is how i Fixed it  I m using xcode Version 6 1 1 and using swift  I got this error every time my app tried to perform a segue to jump to the next screen  Here what I did     Checked that the button was connected to the right action  This wasn t the problem  but still good to check  Check that the button does not have any additional actions or outlets that you may have created by mistake   This wasn t the problem  but still good to check  Check the logs and make sure that all the buttons in the NEXT SCREEN have the correct actions  and if there are any segues  make sure that they have a unique identifier   This was the problem   One of the segues did not have a unique identifier One of the buttons had an action and two outlets that I created by mistake      Delete any additional outlets and make sure that you the segues to the next screen have unique identifiers   Cheers

User · Answer

Check your connections in Interface Builder  You re probably referring to a non existent IBOutlet or IBAction

User · Answer

I had this and looked over everything and didn t see any problems  but eventually remembered to try Clean and clear Derived Data and that solved it

User · Answer

I got this one on a PickerView of all places   The error message was naming the problem with  queuePicker  at the first of the message   It was caused by a previous Referencing Outlet which was no long valid after I added a component and renamed the original NSArray something other than queuePicker   CNTL click on your StoryBoard object gives you the connections   I clicked the  x  next to the ViewController for queuePicker in Referencing Outlets  made a new connection  and viola  no more crashes

User · Answer

If you have different storybord files and if you have outlet references with out outlets creation in your header files then you just remove the connections by right clicking on files owner   Files owner- Right click- remove unwanted connection over there   Go through this for clear explanation  What does this mean   quot   39 NSUnknownKeyException  39   reason      this class is not key value coding-compliant for the key X quot

User · Answer

For me I switched a call for my collection view header where I was registering the nib to registering the class  That fixed it

User · Answer

I had to delete all objects and re-add them  This seemed to have fixed the issue

User · Answer

I had this problem because I was not using StoryBorad  and on the  project properties -  Deploy info -  Main interface was the name of the Main Xib   I deleted the value in Main Interface and solved the problem

User · Answer

In my case I have IBOutlet UILabel  description in  h  it was with yellow     -  will not synthesized   as I remember  Dunno what is it and why only this label   But I got this crash and error like above  Deleted  description and recreate  description2  No crash in result

User · Answer

I encountered this same problem today   As suggested in this answer  the problem was an unclean xib   In my case the unclean xib was the result of updating a xib that was being loaded by something other than the view controller it was associated with   Xcode let me create and populate a new outlet and connected it to the file s owner even though I explicitly connected it to the source of the correct view controller   Here s the code generated by Xcode        lt placeholder placeholderIdentifier  IBFilesOwner  id  -1  userLabel  File s Owner  customClass  LoginViewController    gt           lt connections gt               lt outlet property  hostLabel  destination  W4x-T2-Mcm  id  c3E-1U-sVf   gt           lt  connections gt       lt  placeholder gt    When I ran my app it crashed with the same not key value coding-compliant error   To correct the problem  I removed the outlet from the File s Owner in Interface Builder and connected it explicitly to the view controller object on the left outline instead of to the code in the assistant editor

User · Answer

This usually means that something is trying to access the  property  givenName    If you were doing something with Interface Builder IB   the usual cause is that you either    deleted that property from the class  but haven t deleted the hookups in IB yet OR  you have a File s Owner object set to the wrong class  check the properties - different depending which version of xcode you re using  to find the Class Name its set as  You probably copy pasted a NIB file  and didn t change this field in the NIB   and you ve hooked up an outlet for that class  but your actual File s Owner is something different

User · Answer

I ran into a similar error when creating a custom view class  that was because somehow one of the outlet got hooked up twice in the XIB file I think I initially control dragged the control directly to the code  but latter control dragged again from the File s owner   I opened the XIB file and remove one of them  after that everything worked fine  Hopefully this helps

User · Answer

Go to Xcode s breakpoints tab  Use the button at the bottom to add an exception breakpoint  Now you ll see what code is invoking setValue forKey  and the associated stack  With luck that ll point you straight at the problem s source   Odd that your class is LoginScreen  yet the error is saying someone is using  LoginScreen  as a key  Check that LoginScreen m is part of your target       Footnote  with Swift a common problem arises if you change the name of a class  so  you rename it everywhere in your code   Storyboard struggles with this  and you usually have to re-drag any connections involving that class  And in particular  re-enter the name of the class anywhere used in IdentityInspector tab on the right   In the picture example I deliberately misspelled the class name  But the same thing often happens when you rename a class  even though it s seemingly correct in IdentityInspector  you need to enter the name again  it will correctly autocomplete and you re good to go

User · Answer

For is because is not have 2 function   implementation CellTableView  -  id initWithNibName  NSString   nibNameOrNil bundle  NSBundle   nibBundleOrNil       return  self init     -  void awakeFromNib      -  void setSelected  BOOL selected animated  BOOL animated        super setSelected selected animated animated       end

User · Answer

I had a similar problem  but I was using initWithNibName  NSString   nibNameOrNil bundle  NSBundle   nibBundleOrNil explicitly using the name of the class as the string passed  yes bad form     I ended up deleting and re-creating the view controller using a slightly different name but neglected to change the string specified in the method  thus my old version was still used - even though it was in the trash   I will likely use this structure going forward as suggested in  Is passing two nil paramters to initWithNibName bundle  method bad practice  i e  unsafe or slower    -  id init        super initWithNibName   MyNib  bundle nil           typical initialization         return self     -  id initWithNibName  NSString   nibNameOrNil bundle  NSBundle   nibBundleOrNil       return  self init       Hopefully this helps someone

User · Answer

This happened to me in the following scenario   I created a second project in my workspace  chose  Single View Application  for the template    I then went to Interface Builder  main iPhone storyboard   added a UISwitch to the main view  and connected it to the view controller through both an IBOutlet and an IBAction  -valueChanged     On launch  the app crashes with the exception mentioned in the question  If I remove the switch from the view  it works   After careful inspection   I realized I control-dragged the connections into the ViewController h of another project in the same workspace  The  Automatic  set of Interface Builder s Assistant Editor  a k a Tuxedo chest icon  chose as  counterpart  the wrong file  with the right name    Hope this helps someone  specially because both  Single View Application  and  SpriteKit Game  project templates   in my case  create a default view controller class called  ViewController

User · Answer

You re probably setting a value for a key in the alertView  which is not allowed  The key is in this case LoginScreen  I don t see any call to setValue    so I assume it s somewhere else in the code

User · Answer

I had similar issue with creating custom TableCell  The issue was that I set FileOwner to my custom class and then connected outlets    FileOwner should remain NSObject

User · Answer

Thanks guys  I solved this problem through your help  So  I hope this screenshot helpful to person who have same problem

[objective-c] setValue:forUndefinedKey: this class is not key value coding-compliant for the key

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