Fixes #12

Source/ExpandingViewController/ExpandingViewController.swift

@@ -17,8 +17,13 @@ public class ExpandingViewController: UIViewController {
   public var currentIndex: Int {
     guard let collectionView = self.collectionView else { return 0 }
     
-    let startOffset = (collectionView.bounds.size.width - itemSize.width) / 2
-    return Int((collectionView.contentOffset.x + startOffset) / (itemSize.width + 25))
+    let startOffset = (collectionView.bounds.size.width - itemSize.width) / 2 
+    guard let collectionLayout  = collectionView.collectionViewLayout as? UICollectionViewFlowLayout else {
+      return 0
+    }
+    
+    let minimumLineSpacing = collectionLayout.minimumLineSpacing
+    return Int((collectionView.contentOffset.x + startOffset + itemSize.width / 2) / (itemSize.width + minimumLineSpacing))
   }
 }
 

expanding-collection.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = 'expanding-collection'
-  s.version      = '0.0.4'
+  s.version      = '0.0.5'
   s.summary      = 'Transition animtion from CollectionView to TableView'
   s.license      = 'MIT'
   s.homepage     = 'https://github.com/Ramotion/expanding-collection'