Question

I’m having issues setting the delegate of a Core Data object to a certain view controller I have. I’m getting and error which leads me to believe it’s not synthesizing the accessor methods:

2012-06-23 18:21:20.566 App[34164:12803] -[NSManagedObject setSyncDelegate:]:    unrecognized selector sent to instance 0x907cf30
2012-06-23 18:21:20.567 App[34164:12803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSManagedObject setSyncDelegate:]: unrecognized selector sent to instance 0x907cf30'

The NSManagedObject, SavedPhoto, has the following .h:

@interface SavedPhoto : NSManagedObject

@property (nonatomic, strong) NSString *fileName;
@property (nonatomic, strong) id<SyncPhotoDelegate> syncDelegate;

@end

and .m:

@implementation SavedPhoto

@dynamic fileName;
@synthesize syncDelegate = _syncDelegate;

@end

And I’m trying to set the delegate in a view controller like so:

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
SavedPhoto *savedPhoto = (SavedPhoto *)[NSEntityDescription insertNewObjectForEntityForName:@"SavedPhoto" inManagedObjectContext:context];
[savedPhoto setSyncDelegate:self];

Where “self” is a view controller that implements the protocol SyncPhotoDelegate. Is it even possible to have a synthesized property in an NSManagedObject?

Answer 1

It looks like the instance is not actually one of your class. I would check your model file to make sure it is configured properly. Notice in your console output that it says [NSManagedObject setSyncDelegate:] and not [SavedPhoto
setSyncDelegate:]