iphone - collection view not working when app opens -


i have tab bar app , opening tab contains full screen collection view paging through images. when app opens paging doesn't work of rough , sporadic, however, if change tab , return initial 1 paging works absolutely fine.

has experienced or know causing this?

here code used:

#import "homeviewcontroller.h"  @interface homeviewcontroller ()  @end  @implementation homeviewcontroller  - (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil {     self = [super initwithnibname:nibnameornil bundle:nibbundleornil];     if (self) {         // custom initialization     }     return self; }   - (void)viewdidload {     [super viewdidload];     [self createstonedata]; }  - (void)createstonedata {      self.homeimages = [nsmutablearray array];      [self.homeimages addobject:[[nsmutabledictionary alloc]                                 initwithobjectsandkeys:@"biddlesdon wardrobes", @"name",                                 @"_np19981-edit.jpg", @"image", nil]];     etc….etc…etc….        [self.collectionview reloaddata];  }  - (nsinteger)collectionview:(uicollectionview *)collectionview numberofitemsinsection:(nsinteger)section {     return self.homeimages.count; }   - (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath{     static nsstring *identifier = @"cell";      uicollectionviewcell *cell = [collectionview dequeuereusablecellwithreuseidentifier:identifier forindexpath:indexpath];      uiimageview *homeimageview = (uiimageview *)[cell viewwithtag:100];     homeimageview.image = [uiimage imagenamed:[[self.homeimages objectatindex:indexpath.row] objectforkey:@"image"]];      return cell; }  - (void)scrollviewdidscroll:(uiscrollview *)scrollview {     if (_startingindexpath) {         nsinteger currentindex = floor((scrollview.contentoffset.x - scrollview.bounds.size.width / 1) / scrollview.bounds.size.width) + 1;         if (currentindex < [self.homeimages count]) {             self.title = self.homeimages[currentindex][@"name"];         }     } }  - (bool) shouldautorotate {     return yes; }  -(nsuinteger)supportedinterfaceorientations {     return uiinterfaceorientationmaskall; }  - (void)willrotatetointerfaceorientation:(uiinterfaceorientation)tointerfaceorientation duration:(nstimeinterval)duration {     [self.collectionview.collectionviewlayout invalidatelayout]; }  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }  @end


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