NSInvalidArgumentException - [__ NSCFString unsignedLongLongValue]: unrecognized selector sent to the instance

Question

When using JSONModel to parse my models, I found this exception.

 NSInvalidArgumentException -[__NSCFString unsignedLongLongValue]: unrecognized selector sent to instance 0x1782210c0 

The problem arose inside JSONModel.m , because it depends on [NSObject setValue:forKey:] .

I found a way to easily reproduce it.

 @property NSUInteger uintegerProperty; [...] [self setValue:@"1" forKey:@"uintegerProperty"]; 

This works for 32 bits because setValue ends the longLongVaue call defined in NSString , but in the case of 64 bits it calls unsignedLongLongValue , which is undefined in NSString .

In my particular case, the problem is this enum used in the model.

 typedef NS_ENUM(NSUInteger, kNotificationTypeEnum) { kNotificationTypeResponse = 1, kNotificationTypeAlert = 2 }; 

What is the best way to deal with this situation?

Stack trace

 2014-12-31 17:48:43.789 mobile-iOS[17851:613] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFConstantString unsignedLongLongValue]: unrecognized selector sent to instance 0x10f1feeb0' *** First throw call stack: ( 0 CoreFoundation 0x0000000111b99495 __exceptionPreprocess + 165 1 libobjc.A.dylib 0x00000001118f099e objc_exception_throw + 43 2 CoreFoundation 0x0000000111c2a65d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205 3 CoreFoundation 0x0000000111b8ad8d ___forwarding___ + 973 4 CoreFoundation 0x0000000111b8a938 _CF_forwarding_prep_0 + 120 5 Foundation 0x000000010ff2449b _NSSetUnsignedLongLongValueForKeyWithMethod + 63 6 Foundation 0x000000010fed5530 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259 7 mobile-iOS 0x000000010ee1834c -[AppDelegate application:didFinishLaunchingWithOptions:] + 140 8 UIKit 0x000000011051b3d9 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 264 9 UIKit 0x000000011051bbe1 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1605 10 UIKit 0x000000011051fa0c -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 660 11 UIKit 0x0000000110530d4c -[UIApplication handleEvent:withNewEvent:] + 3189 12 UIKit 0x0000000110531216 -[UIApplication sendEvent:] + 79 13 mobile-iOS 0x000000010eedf48b -[MMApplication sendEvent:] + 331 14 UIKit 0x0000000110521086 _UIApplicationHandleEvent + 578 15 GraphicsServices 0x0000000112df671a _PurpleEventCallback + 762 16 GraphicsServices 0x0000000112df61e1 PurpleEventCallback + 35 17 CoreFoundation 0x0000000111b1b679 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41 18 CoreFoundation 0x0000000111b1b44e __CFRunLoopDoSource1 + 478 19 CoreFoundation 0x0000000111b44903 __CFRunLoopRun + 1939 20 CoreFoundation 0x0000000111b43d83 CFRunLoopRunSpecific + 467 21 UIKit 0x000000011051f2e1 -[UIApplication _run] + 609 22 UIKit 0x0000000110520e33 UIApplicationMain + 1010 23 mobile-iOS 0x000000010ee2af23 main + 243 24 libdyld.dylib 0x000000011230b5c9 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException Signal: 6 (signal SIGABRT) 

Answer 1

The easiest way is to simply use a shorter integer type for the property, for example uint32_t. The second easiest would be to add a category on NSString that provides the missing method.

Answer 2

Ready solution to solve this problem:

 @implementation NSString (UnsignedLongLongValue) - (unsigned long long)unsignedLongLongValue { return self.longLongValue; } @end 

Thanks!

Answer 3

We had a similar error with the iPhone 5 , except that instead of unsignedLongLongValue we got a longValue error. Thus, we used the same category approach with the following code:

 @implementation NSString (LongValue) - (long)longValue { return (long) self.longLongValue; } @end