Xcode 6.1 : Multiple methods named 'count' found with mismatched result, parameter type or attributes

Question

I'm getting Multiple methods named 'count' found with mismatched result, parameter type or attributes error while building app. The app was working fine in 32 bit. I have changed it to 64 bit as per Apple guideline. I have referred this Link but don't got any help.

I have tested app on multiple devices on simulator. It works fine on 32 bit but prompts error in 64 bit. Why is this so?

 -(void)serviceSuccessFulForPatientSelect:(id)response
{
    [self hideOverlay];
    if([response isKindOfClass:[NSArray class]])
    {
        if([response count]>0)
        {
            if(1)
            {
               ...
            }
        }
    }
    [refillDetailTable reloadData];

}

Answer 1

if([response count]>0)

response is an id here, the error suggests there are multiple methods called count which return different types - int and NSInteger I think are different in 64-bit but the same in 32.

To fix, perform a cast:

if([(NSArray*)response count]>0)