swipe to only one item

Author: cp-satish-v

Sources/FSPageViewLayout.swift

@@ -168,6 +168,14 @@ class FSPagerViewLayout: UICollectionViewLayout {
                     offset += self.itemSpacing * (velocity.x)/abs(velocity.x)
                 }
             }
+            
+            let targetIndex = Int(offset/self.itemSpacing)
+            let originalIndex = Int(round(originalContentOffsetX/self.itemSpacing))
+            if targetIndex < originalIndex - 1 {
+                offset = CGFloat(originalIndex - 1)*self.itemSpacing
+            } else if targetIndex > originalIndex + 1 {
+                offset = CGFloat(originalIndex + 1)*self.itemSpacing
+            }
             return offset
         }()
         let proposedContentOffsetY: CGFloat = {