objective c - iOS UICollectionView memory leak -

i've created uicollectionview through storyboard. cell custom cell class have 3 buttons images. images available part of class galleryiteminfo. have array of objects

[gallerydataprovider sharedinstance].iteminfo 

there code cellforitematindexpath (in 1 cell there 3 buttons 3 items in array):

- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath {     collectionviewcellpreviewtriple *cell;      if (indexpath.row % 2 == 0 && !is_iphone) {         cell = [collectionview dequeuereusablecellwithreuseidentifier:@"cellorangered" forindexpath:indexpath];         if (is_fingerprint_version) {             cell.imageviewrope.image = [uiimage imagenamed:@"image-rope-1.png"];         }     } else {         cell = [collectionview dequeuereusablecellwithreuseidentifier:@"cellgreenblue" forindexpath:indexpath];         if (is_fingerprint_version) {             cell.imageviewrope.image = [uiimage imagenamed:@"image-rope-2.png"];         }     }      cell.previewcelldelegate = self;     cell.tag = indexpath.row;     nsinteger leftpreviedid = [cell firstpreviewid];     self.leftpreviewedid = leftpreviedid;      uiimage *image1 = ((galleryiteminfo *)[[gallerydataprovider sharedinstance].iteminfo objectatindex:leftpreviedid]).slotpreviewimage;     uiimage *image2;     uiimage *image3;      if (leftpreviedid + 1 < [[gallerydataprovider sharedinstance].iteminfo count])         image2 = ((galleryiteminfo *)[[gallerydataprovider sharedinstance].iteminfo objectatindex:leftpreviedid + 1]).slotpreviewimage;      if (leftpreviedid + 2 < [[gallerydataprovider sharedinstance].iteminfo count])         image3 = ((galleryiteminfo *)[[gallerydataprovider sharedinstance].iteminfo objectatindex:leftpreviedid + 2]).slotpreviewimage;      [cell setupwithimage1:image1 image2:image2 image3:image3];      if (self.iseditmodeenabled) {         [cell showremovebuttons];     } else {         [cell hideremovebuttons];     }      return cell; } 

trouble: when scroll collection memory usage increases every swipe right left on 1 megabyte.

why memory not released?

update:

collectionviewcellpreviewtriple code (created through storyboard):

#import <uikit/uikit.h>  @protocol uicollectionviewpreviewcelldelegate;   @interface collectionviewcellpreviewtriple : uicollectionviewcell  @property (weak, nonatomic) iboutlet uibutton *buttonslot1; @property (weak, nonatomic) iboutlet uibutton *buttonslot2; @property (weak, nonatomic) iboutlet uibutton *buttonslot3; @property (weak, nonatomic) iboutlet uibutton *buttonremove1; @property (weak, nonatomic) iboutlet uibutton *buttonremove2; @property (weak, nonatomic) iboutlet uibutton *buttonremove3; @property (weak, nonatomic) iboutlet uiimageview *imageviewrope;   @property (nonatomic, weak) id<uicollectionviewpreviewcelldelegate> previewcelldelegate;  - (void)setupwithimage1:(uiimage *)image1 image2:(uiimage *)image2 image3:(uiimage *)image3; - (void)showremovebuttons; - (void)hideremovebuttons;  - (nsinteger)firstpreviewid;  @end   @protocol uicollectionviewpreviewcelldelegate  - (void)collectionviewpreviewcell:(collectionviewcellpreviewtriple *)collectionviewcell didselectsubitemwithindex:(nsinteger)subitemindex; - (void)collectionviewpreviewcell:(collectionviewcellpreviewtriple *)collectionviewcell dideditmoderequestwithstatus:(bool)status; - (void)collectionviewpreviewcell:(collectionviewcellpreviewtriple *)collectionviewcell didremoverequestwithindex:(nsinteger)subitemindex; - (void)slotbuttonrequestsshadow:(uibutton *)slotbutton;  @end 

update:

- (void)setupwithimage1:(uiimage *)image1 image2:(uiimage *)image2 image3:(uiimage *)image3 {     [self.buttonslot1 setbackgroundimage:image1 forstate:uicontrolstatenormal];     [self.buttonslot1 setbackgroundimage:image1 forstate:uicontrolstatehighlighted];      //if (image2) {     [self.buttonslot2 setbackgroundimage:image2 forstate:uicontrolstatenormal];     [self.buttonslot2 setbackgroundimage:image2 forstate:uicontrolstatehighlighted];     [self.buttonslot2 sethidden:(image2 == nil)];     //}     //if (image3) {     [self.buttonslot3 setbackgroundimage:image3 forstate:uicontrolstatenormal];     [self.buttonslot3 setbackgroundimage:image3 forstate:uicontrolstatehighlighted];     [self.buttonslot3 sethidden:(image3 == nil)];     //} } 

profiling link screen

this may related issue many people have been suffering cell's not reused.

to test this, should override method prepareforreuse , in write simple log:

nslog(@"%@ being called expected.", nsstringfromselector(_cmd)); 

you should run app, scroll collection view, , check console see if log appears.

if log not appear, may want check answer how proceed. in app cells not reused in simulator, reused on devices. it's odd.