Sprite Kit iOS7 - SKNode UserData property not storing values

Question

I would think this work work easily, however I cannot understand why my NSMutableDictionary property is not working as I would have expected.

[self.testSprite.userData setValue:@"CAT" forKey:@"key"];
NSLog(@"%@", [self.testSprite.userData objectForKey:@"key"]);
NSLog(@"%lu", [self.testSprite.userData count]);

I am retuning (null) and 0.

Is there a special trick for using the spriteNode userdata ?

Thanks

score 20 · Accepted Answer · answered Sep 29 '13 at 08:40

20

The userData property is initially nil. You have to create a dictionary and assign it first:

self.testSprite.userData = [NSMutableDictionary dictionary];

[self.testSprite.userData setValue:@"CAT" forKey:@"key"];
NSLog(@"%@", [self.testSprite.userData objectForKey:@"key"]);
NSLog(@"%lu", [self.testSprite.userData count]);

answered Sep 29 '13 at 08:40

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This almost killed me...thanks! Why trying to setValue on a nil doesn't throw a warning/error is beyond me. – Scooter Mar 30 '15 at 17:49
Lol this is crazy! Thank you – mikemike396 Jan 11 '16 at 03:42

Sprite Kit iOS7 - SKNode UserData property not storing values

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