UICollectionViewCell is not showing DetailView when tapped - objective-c

Question

I implemented a CollectionView with ImageViews in the cells. I want a DetailViewController to appear when the cell is tapped. I set the User Interaction Enabled in the Interface Builder for the ImageView and the Cell. What am I making wrong? I have this code in the ViewController:
- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section;
{
return 9;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;
{
PhotosCell *cell = [cv dequeueReusableCellWithReuseIdentifier:kCellID forIndexPath:indexPath];
// load the image for this cell
NSString *imageToLoad = [NSString stringWithFormat:#"%d.jpg", indexPath.row +1];
// NSLog(imageToLoad);
cell.imageView.image = [UIImage imageNamed:imageToLoad];
return cell;
}
// the user tapped a collection item, load and set the image on the detail view controller
//
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// NSLog(#"inside!");
if ([[segue identifier] isEqualToString:#"showDetail"])
{
NSIndexPath *selectedIndexPath = [[self.collectionView indexPathsForSelectedItems] objectAtIndex:0];
// load the image, to prevent it from being cached we use 'initWithContentsOfFile'
NSString *imageNameToLoad = [NSString stringWithFormat:#"%d_full", selectedIndexPath.row+1];
NSString *pathToImage = [[NSBundle mainBundle] pathForResource:imageNameToLoad ofType:#".jpg"];
UIImage *image = [[UIImage alloc] initWithContentsOfFile:pathToImage];
PhotoDetailViewController *detailViewController = [segue destinationViewController];
detailViewController.myImage = image;
}
}
But the method "prepareForSegue" is not being called when the cell is tapped...

Answer 1

implement collectionview delegate method
collectionView:didSelectItemAtIndexPath:
there call
[self performSegueWithIdentifier:#"showDetail" sender:self];