ios - UICollectionView showing only one cell - which changes when the view is scrolled -

i have uicollectionview supposed show items array. have checked array - , populated right number , type of objects.

the uicollectionview shows 1 uicollectionview cell - , changes when pull cell down previous object. i've not seen behaviour before. below code:

(it's sourcetankcollectionview causing problem (and assume destination collection view cell too)

- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath {     if (collectionview==self.movementsindexcollectionview)     {          transferslistcollectionviewcell* tempcell = [collectionview dequeuereusablecellwithreuseidentifier: @"transfer list cell" forindexpath:indexpath];         if (!tempcell)         {             tempcell = [[transferslistcollectionviewcell alloc] init];         }          movement* thismovement = [self.arrayofallmovements objectatindex:indexpath.item];          tempcell.sourcetanklabel.text = thismovement.sourcetank.tanknumber;         tempcell.destinationtanklabel.text = thismovement.destinationtank.tanknumber;         tempcell.layer.borderwidth = 1.5;         tempcell.layer.bordercolor = [[uicolor darkgraycolor] cgcolor];         tempcell.layer.cornerradius = 4;         return tempcell;     }      else if (collectionview==self.sourcetankscollectionview)     {         sourcetankcollectionviewcell* tempcell = [collectionview dequeuereusablecellwithreuseidentifier: @"source tank collection cell" forindexpath:indexpath];         if (!tempcell)         {             tempcell = [[sourcetankcollectionviewcell alloc] init];         }         int index = indexpath.row;          if (!tempcell)         {             tempcell = [[sourcetankcollectionviewcell alloc] init];         }          tank* thissourcetank = [self.arrayofsourcetanks objectatindex:indexpath.row];         product* thissourcetankproduct = thissourcetank.tankproduct;          tempcell.tanknumberlabel.text = thissourcetank.tanknumber;         tempcell.tankproductlabel.text = thissourcetankproduct.name;         tempcell.tankvolumelabel.text = thissourcetank.tanktotalvolume;         tempcell.tankvolumegauge.percentfilled = [thissourcetank.tanktotalvolume doublevalue]/[thissourcetank.tankmaxvolume doublevalue];         //tempcell.tankvolumetotransferlabel.text = [thismovement.volume stringvalue];         //tempcell.tankvolumetransferredlabel.text = @"35000";         tempcell.transferstatuslabel.text = @"in progress";          tempcell.backgroundcolor = [uicolor darkgraycolor];         tempcell.layer.borderwidth = 1.5;         tempcell.layer.bordercolor = [[uicolor whitecolor] cgcolor];         tempcell.layer.cornerradius = 8;          tempcell.frame = cgrectmake(self.sourcetankscollectionview.frame.size.width * 0.05, self.sourcetankscollectionview.frame.size.width * 0.05, self.sourcetankscollectionview.frame.size.width * 0.9, 103);         return tempcell;     }     else //if (collectionview==self.destinationtankscollectionview)     {         destinationtankcollectionviewcell* tempcell = [collectionview dequeuereusablecellwithreuseidentifier: @"destination tank collection cell" forindexpath:indexpath];         if (!tempcell)         {             tempcell = [[destinationtankcollectionviewcell alloc] init];         }         tank* thisdestinationtank = [self.arrayofdestinationtanks objectatindex:indexpath.item];         product* thisdestinationtankproduct = thisdestinationtank.tankproduct;          tempcell.tanknumberlabel.text = thisdestinationtank.tanknumber;         tempcell.tankproductlabel.text = thisdestinationtankproduct.name;         tempcell.tankvolumelabel.text = thisdestinationtank.tanktotalvolume;         tempcell.tankvolumegauge.percentfilled = [thisdestinationtank.tanktotalvolume doublevalue]/[thisdestinationtank.tankmaxvolume doublevalue];          tempcell.backgroundcolor = [uicolor darkgraycolor];         tempcell.layer.borderwidth = 1.5;         tempcell.layer.bordercolor = [[uicolor whitecolor] cgcolor];         tempcell.layer.cornerradius = 8;          tempcell.frame = cgrectmake(self.destinationtankscollectionview.frame.size.width * 0.05, self.destinationtankscollectionview.frame.size.width * 0.05, self.destinationtankscollectionview.frame.size.width * 0.9, 103);         return tempcell;     } }  - (nsinteger)collectionview:(uicollectionview *)collectionview numberofitemsinsection:(nsinteger)section {     if (collectionview == self.movementsindexcollectionview)     {         return self.arrayofallmovements.count;     }     else if (collectionview == self.sourcetankscollectionview)     {         return self.arrayofsourcetanks.count;     }     else //(collectionview == self.destinationtankscollectionview)     {         return self.arrayofdestinationtanks.count;     } } 

many help! assume easy fix!

you not supposed set frame of uicollectionviewcell. can set width , height. , should done in:

- (cgsize)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout*)collectionviewlayout sizeforitematindexpath:(nsindexpath *)indexpath{      return cgsizemake(collectionview.frame.size.width/2.0, collectionview.frame.size.height/2.0); } 

as can observe cells collection view have same frame rectangle. maybe causing problem. cells on top of each other.

tempcell.frame = cgrectmake(self.sourcetankscollectionview.frame.size.width * 0.05, self.sourcetankscollectionview.frame.size.width * 0.05, self.sourcetankscollectionview.frame.size.width * 0.9, 103);