Every time try to set the value of any variable in my model object, I receive 'Unrecognized selector sent to instance' error, and the app crashes. The ivars have been synthesized and they are not readonly. I have checked to see the values set are of the right type.
I am not sure if it has to do with some connection in IB, which I have checked an re-checked.
One extra bit of information: I started developing in an earlier version of Xcode, and the same piece of code used to work on that version.
Here is the exact error message:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFString setDistance:]: unrecognized selector sent to instance 0x380ce50'
2009-11-10 15:10:58.113 CabMeter[7432:207] Stack: (
29303899,
2457931593,
29685819,
29255286,
29107906,
11415,
3140002,
3149770,
3199319,
3236748,
3170686,
3230561,
3179329,
12452,
3918761,
3933474,
4979284,
4987529,
3990121,
2838067,
2746396,
2773173,
37400273,
29088640,
29084744,
37394317,
37394514,
2777091,
9208,
9062
)
The ivars have been synthesized and they are not readonly.
I think you're confusing instance variables with properties. Properties are what you normally synthesize and/or make read-only, and they are usually, but not necessarily, backed by instance variables.
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFString setDistance:]: unrecognized selector sent to instance 0x380ce50'
This is why you should read the error message.
You're not sending your setDistance: message to your model object—you're sending it to a string. Most likely, you didn't retain the model object like you should have, and a string got allocated shortly thereafter with the same address.
Review the memory management rules and look to find where you're not following them. If all of your properties are set correctly, make sure you're actually using them: A common mistake is to assign directly to the ivar:
myModel = [[[MyModel alloc] init] autorelease]
instead of going through the property:
self.myModel = [[[MyModel alloc] init] autorelease]
or
[self setMyModel:[[[MyModel alloc] init] autorelease]]
'Unrecognized selector sent to instance' sounds like you have a delegate the defines a selector for a method that doesn't exist.
Do you have a #selector(methodName) anywhere in your code?
In the stack trace, what is the last of your code that is called before the exception is thrown?
If it's on the setter method, could we see how you declare the instance variable and how you synthesize it?
Related
Whenever I call the code below,
BOOL currentState = [[allGroupThreeArray objectAtIndex:indexNumber] getState];
I get the the console errors below:
-[UIImageView objectAtIndex:]: unrecognized selector sent to instance 0x1f574d50
and
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIImageView objectAtIndex:]: unrecognized selector sent to instance 0x1f574d50'
I have no idea why it says "UIImageView objectAtIndex" because allGroupThreeArray is an NSArray which is defined above the #implementation by the code below
static NSArray *selectedGroupThreeArray;
selectedGroupThreeArray is an array of instances of my class "ItemInstance" and "getState" is a public method in that class that returns a bool.
I have spent hours on this and have absolutely no idea what the issue is. Any help is greatly appreciated!
EDIT: indexNumber is defined by the code below
int indexNumber = itemNumber-300-1;
where itemNumber is a parameter that is sent to the method that all of this is occurring in.
Errors like this are usually signs of memory issues. Your array is probably released, but not set to nil before you try to call objectAtIndex:.
I got this weird crash in my app, when i try to call this function on my object pageModel
[pageModel pageTitle] isEqualToString:#"some text"];
This is the debugger dump
-[__NSArrayM isEqualToString:]: unrecognized selector sent to instance 0x661de40
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM isEqualToString:]: unrecognized selector sent to instance 0x661de40'
and messing around with the debugger I found out some really strange behaviour
(gdb) po pageModel
<PXPage: 0x6622e20>
(gdb) po [pageModel pageTitle]
<__NSArrayM 0x661de40>(...
(gdb) po pageModel.pageTitle
<__NSArrayM 0x661de40>(...
It thinks it's a MutableArray but it's not. It should be a NSString...And some other time it was an UIImage and other time something else and so on.
Does anyone as a clue about what's going on here?
Thanks
This is a classic double release error. An object has been released too many times, the memory it occupies has been assigned to another object, so that other object is receiving messages meant for the old object.
You want set the NSZombieEnabled environment variable to YES in the scheme editor and run your application in the debugger. Google and/or stackoverflow search can help you find more information on this.
[pageModel pageTitle] is returns array. you are using NSString Class . it is the reason to crash. so check the data type of [pageModel pageTitle].
I have a core data NSManagedObject named CD_CoffeeShop . When i allocated a variable
CD_CoffeeShop *temp_CS = [ CD_CoffeeShop new]
and try to pass a value to it,
[temp_CS setCoffeeShopId:[NSNumber numberWithInt:coffeeShop.Id]];
(the variable coffeeShopId of temp_CS is a NSNumber)
i get an error that says :
Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: '-[CD_CoffeeShop
setCoffeeShopId:]: unrecognized selector sent to instance 0x6b34040'
What can it be ?
Have you read the Core Data Programming guide? You do not instantiate core data objects with the NSObject methods. You either obtain them with a fetch request if they exist already or you use NSEntityDescription to insert a new object into the context.
Definitely don't use new.
Hi i am a newbie to iPHone development and I am getting this error that states that the setter method cannot be found for a string variable despite that variable being declared with the #property and #synthesize declarations. The variable is contained within a seperate object to the class which I am attempting to set the value.
Any help would be appreciated.
here is the code relating to the error.
[reg setPolicyNumber:self.policyNoField.text];
[reg printSummaryToConsole];
debugger says that
-[__NSCFSet setPolicyNumber:]: unrecognized selector sent to instance 0x643fd80
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFSet setPolicyNumber:]: unrecognized selector sent to instance 0x643fd80'
I have allocated an initialized the Registration class (reg) in this class and I have the PolicyNumber created and synthesized in the registration class also. yet I am still getting this error.
Any help would be appreciated.
reg is a reference to an instance of NSCFSet.
Most likely, you failed to retain whatever reg was supposed to refer to in the first place and, coincidentally, an NSCFSet happened to be allocated where the old object was.
Use Build and Analyze, then use zombie detection if that doesn't identify the problem.
Using CoreData (on an iPhone app) I generated my entity classes from the model and I added some more methods to some ones. It appears that sometimes I get an exception for calling one of those methods. The exception is not random but concerns only some ManagedObject subclass (the others seem to respond correctly).
Here is an example of what i get:
-[NSManagedObject printTime]: unrecognized selector sent to instance 0x5b50af0
2010-07-15 10:29:55.216 LP[6686:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSManagedObject printTime]: unrecognized selector sent to instance 0x5b50af0'
The NSManagedObject is an object I get from a fetch (casted to the correct subclass), and the methods I am talking about are printing methods. (I tried to retrieve those not as faults either)
Am I missing something?
Did you set the correct class for the entity in the managed object model?