Question

I asked this question in the restkit google group, but realize now that it might actually be a more broad issue and not RK specific.

I’ve been going around in circles for a few hours on this one. I’m trying to populate a UITableView with data retrieved from a webservice and stored in objects using RestKits object mapping. Hitting the service, storing the objects all works beautifully.

The issue is when I try to reloadData for the Table. I’m getting this error –

'NSInvalidArgumentException', reason: '-[CoursesModel text]: unrecognized selector sent to instance and then app shuts down and 

takes me here: 
@autoreleasepool { 
return UIApplicationMain(argc, argv, nil, 
NSStringFromClass([RoundShoutAppDelegate class])); 
} 
Thread 1: signal SIGABRT 

CoursesModel is the model I setup. If I don’t specify the tableview’s delegate as the class (which I know I have to) then the courses load perfectly in the table view. But I’ll get an error when i try to click on one of the cells (at didSelectRowAtIndexPath. So focusing on
the fact that I have to specify a delegate, I know something is really messed up and I can;t figure it out.

I’m assuming something is getting released when it shouldn’t, but data is in the _courses array. This is an ARC project by the way.

Here is some of the pertinent code, but if you need more let me know. If anyone has any info a at all to point me in the right direction that would be awesome! Thanks for your help!

MainViewController.h 
@interface MainViewController : UITableViewController <CLLocationManagerDelegate, RKObjectLoaderDelegate, UITableViewDelegate, UITableViewDataSource> { 
IBOutlet UITableView *coursesTableView; 
NSArray *_courses; 
} 

@end 

CoursesModel.h

@interface CoursesModel : NSObject { 
NSNumber* _courseID; 
NSString* _courseName; 
NSString* _city; 
NSString* _state; 
NSNumber* _distance; 
} 

@property (nonatomic, retain) NSNumber* courseID; 
@property (nonatomic, retain) NSString* courseName; 
@property (nonatomic, retain) NSString* city; 
@property (nonatomic, retain) NSString* state; 
@property (nonatomic, retain) NSNumber* distance; 
@end 

MainViewController.m

//Most of the code ommited for your sanity 
// All good up to this point 
- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObjects: 
(NSArray*)objects { 
 //NSLog(@"Loaded courses %@", objects); 
_courses = objects; 
// There is data in _courses. 
NSLog(@"Loaded courses in array %@", _courses); 
[coursesTableView reloadData]; 

Delegate Methods:

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { CGSize size = [[[_courses objectAtIndex:indexPath.row] text] sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(300, 9000)]; 
return size.height + 10; 
}

Answer 1

I see it now! Your delegate method

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { 

CGSize size = [[[_courses objectAtIndex:indexPath.row] text] sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(300, 9000)]; 

return size.height + 10; 

}

is wrong. NSArray has no method called -text, therefore it caused an unrecognized selector to be sent to NSArray. Why didn’t the compiler warn you about this? If you need a string, use -stringValue.

And as for your delegate thing, this makes complete sense now, because not setting the delegate would not call this method on reload.