ios - unrecognized selector sent to instance 0x8c9a6d0

Question

Can anyone tell me what is going on in this error code

[UIViewController collectionView:numberOfItemsInSection:]: unrecognized selector sent to instance 0x8c9a6d0

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController collectionView:numberOfItemsInSection:]: unrecognized selector sent to instance 0x8c9a6d0'

the collectionView code is

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {     
    return [array count];
}

what have i done wrong

Answer 1

well, seems you don't set the right instance as datasource.

the runtime is trying to call the method on a UIViewController. That is wrong as that cannot be the right class.

my guess is that you haven't set your view controller's class in the xib and therefore a default UIViewController is used