nscollectionviewitem - NSCollectionView with different item types -

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accordingly apple documentation can use multiple item types in single nscollectionview, when it, problem. can't remove items.

a single collection view can support multiple item types, each own distinct appearance, , can mix , match item types in same collection view if want.

my code snippet 

- (nscollectionviewitem *)collectionview:(nscollectionview *)collectionview       itemforrepresentedobjectatindexpath:(nsindexpath *)indexpath {      nsinteger index = indexpath.item;     dataitem * item = [self.data itemat:index];      if (item.type == itemtype1) {         typeitemcontroller1 * itemcontroller = [collectionview makeitemwithidentifier:@"typeitemcontroller1"                                                                           forindexpath:indexpath];          [itemcontroller updatewithindex:index];         return itemcontroller;      } else {         typeitemcontroller2 * itemcontroller = [collectionview makeitemwithidentifier:@"typeitemcontroller2"                                                                           forindexpath:indexpath];          [itemcontroller updatewithindex:index];         return itemcontroller;     } }  -(void)collectionview:(nscollectionview *)collectionview           removeitemsat:(nsset<nsindexpath*>*) paths {      (nsindexpath * path in paths) {         [self.data removeitemat:path.item];     }      [[collectionview animator] deleteitemsatindexpaths:paths]; }

if have items different types in nscollectionview , have removed 1 of them, item (removed) still displayed on screen. can't interact it, displayed on screen.

if items have same type, problem doesn't occur.

what i'm doing wrong?


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