Subviews of UITableView?

Subviews of UITableView?

I have an UITableView with five costum UITableViewCells. If the TableView
scrolls all Cells should perform the same method.
Here is the code:
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
if(self.newsViewTable == scrollView) {
for(int i = 1; i < [self.newsViewTable.subviews count]; i++) {
[[self.newsViewTable.subviews objectAtIndex:i]
hideSocialMediaBar];
}
}
}
But if I scoll there comes an error!
*** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: '-[UIImageView hideSocialMediaBar]:
unrecognized selector sent to instance 0x8a9ea90'
I don't now why the error deals with an UIImageView? There is just one
direct subview of the UITableView and this is the Cell! What is wrong? Why
it is an UIImageView?