title: didSelectItemAtIndexPath is not calling in ios swift
body: <p>When I just select/tap on item, <code>didSelectItemAtIndexPath</code> method was not called. But when I long press on item then <code>didSelectItemAtIndexPath</code> it is calling work perfectly. Why it happens like this. What should I did wrong?</p>
  
  <p>I added collection view as follows</p>
  
  <p>collectionview_followers.frame = CGRectMake(0, 50, SCREEN_WIDTH, 150)</p>
  
  <pre><code>    collectionview_followers.delegate = self
  
      collectionview_followers.dataSource = self
  
      collectionview_followers.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "FollowersCell")
  
      collectionview_followers.backgroundColor = UIColor.clearColor()
  
      collectionview_followers.userInteractionEnabled = true
  
      collectionview_followers.allowsSelection = true
  
      view_collectionviewBG.addSubview(collectionview_followers)
  </code></pre>
  
  <p>and cell contains uiview with image and label</p>