objective c - Adjust UICollectionViewFlowLayout When UICollectionView Frame Changes -

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i have uicollectionview created programmatically, along uicollectionviewflowlayout. code looks like:

- (uicollectionview *)createcollectiontodisplaycontent:(nsarray *)array viewwithcellidentifier:(nsstring *)cellidentifier ofwidth:(cgfloat)width withheight:(cgfloat)height foremailview:(emailview *)emailview  {   cgfloat mininteritemspacing;   if (!self.orientationislandscape) mininteritemspacing = 9.0f;     else mininteritemspacing = 20.0f;   uicollectionviewflowlayout *layout = [[uicollectionviewflowlayout alloc]init];      layout.itemsize = cgsizemake(220.0f, 45.0f);      layout.sectioninset = uiedgeinsetsmake(5.0f, 0.0f, 5.0f, 0.0f);      layout.minimumlinespacing = 10.0f;      layout.minimuminteritemspacing = mininteritemspacing;      //get pointer layout can change later      emailview.personlabelslayout = layout;   uicollectionview *collectionview = [[uicollectionview alloc]initwithframe:cgrectmake(40, 4, width, height) collectionviewlayout:layout];      collectionview.datasource = emailview;      collectionview.delegate = emailview;      collectionview.scrollenabled = no;      collectionview.userinteractionenabled = yes;      collectionview.backgroundcolor = [uicolor clearcolor];      [collectionview registerclass:[uicollectionviewcell class] forcellwithreuseidentifier:cellidentifier];      collectionview.autoresizingmask = (uiviewautoresizingflexiblewidth | uiviewautoresizingflexibleheight | uiviewautoresizingflexiblerightmargin | uiviewautoresizingflexiblebottommargin);      [collectionview reloaddata];   return collectionview;  }

this code works fine display collection view. issue in trying change flow layout when device rotated. handle change in collection view frame using struts , springs (see above), , in willanimaterotationtointerfaceorientation method, adjust minimuminteritemspacing property of flow layout, , call reload data on collection view. here code that:

- (void)willanimaterotationtointerfaceorientation:(uiinterfaceorientation)tointerfaceorientation duration:(nstimeinterval)duration {         cgfloat mininteritemspacing;  if (tointerfaceorientation == uiinterfaceorientationlandscapeleft || tointerfaceorientation == uiinterfaceorientationlandscaperight) {     mininteritemspacing = 20.0f; }  else {        mininteritemspacing = 9.0f;    }  self.visibleemailview = //...more code self.visibleemailview.personlabelslayout.minimuminteritemspacing = mininteritemspacing; [self.visibleemailview.personlabelscollectionview reloaddata];      //other stuff...    }

ultimately, flow layout should adjust dramatically when view rotated: in terms of minimuminteritemspacing in terms of number of columns displays. however, layout not adjusting expect. having trouble figuring out happening. looks minimuminteritemspacing not being reset on rotation, , looks each cell, same cell being drawn on multiple times. also, i'm getting crashes say: 

"the collection view's data source did not return valid cell -collectionview:cellforitematindexpath: index path <nsindexpath 0x9be47e0> 2 indexes [0, 6]"

in trying begin narrow down going on here, wondering if can tell me if approach correct, and/or if there obvious error in code might causing or of funky behavior.

are implementing this?

- (bool) shouldinvalidatelayoutforboundschange:(cgrect)newbounds {     return yes; ]

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