NSUnknownKeyException Causing Crash on Button Click

Question

So I'm not sure what is going on. I haven't really changed much. Nothing having to do with this class anyways. It was working fine just a bit before and now I'm getting this crash.

-(IBAction)mphButton:(id)sender{
    if(self.mphVC == nil){
        MphViewController *mph = [[MphViewController alloc] initWithNibName:@"MphView" bundle:[NSBundle mainBundle]];
        self.mphVC = mph;
        [mph release];
    }

    [self.navigationController pushViewController:self.mphVC animated:YES];
}

The thread is stopping saying "Thread 1: Program received signal "SIGABRT" on the [self.navigationController pushViewController:self.mphVC animated:YES];

This is what the message:

2011-09-29 10:59:03.557 SpeedClock[2973:b303] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<MphViewController 0x4b42ad0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key count.'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x00dc25a9 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x00f16313 objc_exception_throw + 44
    2   CoreFoundation                      0x00dc24e1 -[NSException raise] + 17
    3   Foundation                          0x00794677 _NSSetUsingKeyValueSetter + 135
    4   Foundation                          0x007945e5 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 285
    5   UIKit                               0x0021030c -[UIRuntimeOutletConnection connect] + 112
    6   CoreFoundation                      0x00d388cf -[NSArray makeObjectsPerformSelector:] + 239
    7   UIKit                               0x0020ed23 -[UINib instantiateWithOwner:options:] + 1041
    8   UIKit                               0x00210ab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
    9   UIKit                               0x000c6628 -[UIViewController _loadViewFromNibNamed:bundle:] + 70
    10  UIKit                               0x000c4134 -[UIViewController loadView] + 120
    11  UIKit                               0x000c400e -[UIViewController view] + 56
    12  UIKit                               0x000c2482 -[UIViewController contentScrollView] + 42
    13  UIKit                               0x000d2f25 -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:] + 48
    14  UIKit                               0x000d1555 -[UINavigationController _layoutViewController:] + 43
    15  UIKit                               0x000d2870 -[UINavigationController _startTransition:fromViewController:toViewController:] + 524
    16  UIKit                               0x000cd32a -[UINavigationController _startDeferredTransitionIfNeeded] + 266
    17  UIKit                               0x000d4562 -[UINavigationController pushViewController:transition:forceImmediate:] + 932
    18  UIKit                               0x000cd1c4 -[UINavigationController pushViewController:animated:] + 62
    19  SpeedClock                          0x00002621 -[RootViewController mphButton:] + 353
    20  UIKit                               0x000144fd -[UIApplication sendAction:to:from:forEvent:] + 119
    21  UIKit                               0x000a4799 -[UIControl sendAction:to:forEvent:] + 67
    22  UIKit                               0x000a6c2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
    23  UIKit                               0x000a57d8 -[UIControl touchesEnded:withEvent:] + 458
    24  UIKit                               0x00038ded -[UIWindow _sendTouchesForEvent:] + 567
    25  UIKit                               0x00019c37 -[UIApplication sendEvent:] + 447
    26  UIKit                               0x0001ef2e _UIApplicationHandleEvent + 7576
    27  GraphicsServices                    0x00ffb992 PurpleEventCallback + 1550
    28  CoreFoundation                      0x00da3944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
    29  CoreFoundation                      0x00d03cf7 __CFRunLoopDoSource1 + 215
    30  CoreFoundation                      0x00d00f83 __CFRunLoopRun + 979
    31  CoreFoundation                      0x00d00840 CFRunLoopRunSpecific + 208
    32  CoreFoundation                      0x00d00761 CFRunLoopRunInMode + 97
    33  GraphicsServices                    0x00ffa1c4 GSEventRunModal + 217
    34  GraphicsServices                    0x00ffa289 GSEventRun + 115
    35  UIKit                               0x00022c93 UIApplicationMain + 1160
    36  SpeedClock                          0x00001f59 main + 121
    37  SpeedClock                          0x00001ed5 start + 53
    38  ???                                 0x00000001 0x0 + 1
)
terminate called throwing an exceptionCurrent language:  auto; currently objective-c
(gdb)

I can read these pretty well on Logcat on android. Just not use to reading this one. I saw another post saying that their class might not have been connected to their view. Mine is. It was working just fine prior to me putting in some stuff (which I recommented out and it still isnt working) on the MPHViewController.m

Any and all help is appreciated... Thanks :)

@Nekto Sorry still new to Obj C. You asking how I have it set up if so this is the Root.h files `@interface RootViewController : UIViewController { MphViewController *mphVC; } @property(nonatomic,retain) MphViewController *mphVC; -(IBAction)mphButton:(id)sender; @end` — steven, Sep 29 '11 at 18:13

score 3 · Accepted Answer · answered Sep 29 '11 at 18:12

3

You most likely have something in your "MphView" XIB file called "count" that you no longer have in MphViewController. Maybe a delegate set for an object that's no longer there, or an action, or something like that. Check all your connections in Interface Builder and remove any broken ones.

answered Sep 29 '11 at 18:12

alex_c

2,058
2
26
34

Nice eye. I had changed something and I had looked over the xib file with the ones I had recently messed with and I forget to look at the pcount one which I did change and forgot to fix. Do you mind telling me where you were able to spot that in that trace so I know how to find it next time? Thanks again – steven Sep 29 '11 at 18:21
Nevermind I see where it is. Thanks again. It's working great again. – steven Sep 29 '11 at 18:28
Yeah, it's the "this class is not key value coding-compliant for the key count" part. I've run into it many times, very frustrating until I figured out what it actually means. – alex_c Sep 29 '11 at 18:51

NSUnknownKeyException Causing Crash on Button Click

1 Answers1