NSArray becomes NSCFArray when passed

Question

I have a method that receives many different kinds of objects and decides what to do with them:

-(void)performAction:(NSObject *)myAction withItem:(Item *)my         


        

Answer 1

Two possibilities worth considering:

• NSArray is a class cluster. I don't know the exact behaviour of -isMemberOfClass: and -isKindOfClass: on clusters. you can check this question for more precisions: Is it safe to use isKindOfClass: against an NSString instance to determine type?

• Have you tried -isKindOfClass: instead of -isMemberOfClass:?

Answer 2

NSСFArray is subclass of NSMutable Array

You can use isKindOfClass to check it

if ([myAction isMemberOfClass:[Look class]]) {
    currentActionArray = [self createLookArray:(Look *)myAction item:myItem];
} else if ([myAction isMemberOfClass:[Use class]]) {
        currentActionArray = [self createUseArray:(Use *)myAction item:myItem];
} else if ([myAction isMemberOfClass:[Exit class]]) {
        currentActionArray = [self createExitArray:(Exit *)myAction item:myItem];
} else if ([myAction isKindOfClass:[NSArray class]] ) {
        NSLog(@"--- CUSTOM ACTION --- %@", myAction);
        currentActionArray = (NSArray *)myAction;
} 

Answer 3

You can try using isKindOfClass: instead of isMemberOfClass:.

The first one will return YES for objects that are either instances of the class you send, or subclasses of it, as it may be the case for NSCFArray.