Filtering NSMutableArray based on enum property

Question

I've got an NSMutableArray filled with objects of type "GameObject". GameObject has a number of properties, one of which being "gameObjectType" . "gameObjectType" is of type GameObjectTypeEnum. I want to be able to filter this NSMutableArray so only GameObjects of a certain type are returned. I've got the following in place, but it's giving me a "BAD ACCESS" error:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"gameObjectType = %@", gameObjectType];
return [gameObjects filteredArrayUsingPredicate:predicate];

Is it possible to pass a "custom" type (ie, this enum I've defined) into the predicateWithFormat call?

Chuck · Accepted Answer · 2010-06-13 19:16:41Z

22

The string format specifier %@ indicates an object, while you're passing an integral value. You probably want to typecast the gameObjectType to an int and use the %d specifier. Take a look at the string format specifiers for more info.

answered Jun 13, 2010 at 19:16

Chuck

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1 Comment

Marty Over a year ago

Casting to int and using %d gave me what I needed! Thanks.

Yunus Nedim Mehel · Accepted Answer · 2015-12-14 08:36:25Z

7

- (NSArray *)arrayFilteredByType:(enumType)type {

     //type is an NSUInteger property of the objects in the array 
     NSPredicate *predicate = [NSPredicate predicateWithFormat:@"type = %d", type];
     return [self.array filteredArrayUsingPredicate:predicate];
}

edited Dec 14, 2015 at 8:36

answered Nov 24, 2015 at 9:13

Yunus Nedim Mehel

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