KVC dot keys issue

Question

I create class:

@interface KVOGame : NSObject

@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSString *releaseDate;
@property (nonatomic, strong) KVOPlatform *platform;

@end

And another one for it property:

@interface KVOPlatform : NSObject

@property (nonatomic, strong) NSString *platformName;
@property (nonatomic, strong) NSString *platformVersion;

@end

Then I try to use KVC to get "platformVersion" like this

@interface KVOViewController ()

@end

@implementation KVOViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    KVOGame *game = [[KVOGame alloc] init];
    game.name = @"Bayonetta";
    game.releaseDate = @"8.10.2009";
    game.platform.platformName = @"PS3, Xbox360";
    game.platform.platformVersion = @"all versions";

    NSString *identifier = @"platform.platformVersion";

    NSLog(@"%@", [game valueForKey:identifier]);
}

And it crash with error:

Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ valueForUndefinedKey:]: this class is not key value coding-compliant for the key platform.platformVersion.'

What am I doing wrong?

Update: valueForKeyPath: instead of valueForKey also does not work - crash anyway.

Answer 1

try NSLog(@"%@", [game valueForKeyPath:identifier]);

I assume game.platform never to be created. It is nil