uiinterfaceorientation - UICollectionView not adapting to iPad screen during rotation - 


#pragma mark rotation handling methods  -(void)willrotatetointerfaceorientation:(uiinterfaceorientation)tointerfaceorientation duration: (nstimeinterval)duration { nslog(@"is rotating"); // fade collectionview out [self.collectionview setalpha:0.0f];  // suppress layout errors invalidating layout [self.collectionview.collectionviewlayout invalidatelayout];  // calculate index of item collectionview displaying cgpoint currentoffset = [self.collectionview contentoffset]; self.currentindex = currentoffset.x / self.collectionview.frame.size.width; }  - (void)viewwilllayoutsubviews; { [super viewwilllayoutsubviews]; uicollectionviewflowlayout *flowlayout = (id)self.collectionview.collectionviewlayout;  if (uideviceorientationislandscape([[uiapplication sharedapplication] statusbarorientation])) {     flowlayout.itemsize = cgsizemake(self.view.bounds.size.width, self.view.bounds.size.height); } else {     flowlayout.itemsize = cgsizemake(self.view.bounds.size.width, self.view.bounds.size.height); }  [flowlayout invalidatelayout]; //force elements laid out again new size }   -(void)didrotatefrominterfaceorientation:(uiinterfaceorientation)frominterfaceorientation {  // force realignment of cell being displayed cgsize currentsize = self.view.bounds.size; float offset = self.currentindex * currentsize.width; [self.collectionview setcontentoffset:cgpointmake(offset, 0)];   nslog(@"current bounds: %f",self.view.bounds.size.width); nsindexpath *indexpath = [nsindexpath indexpathforitem:self.currentindex insection:0]; [self.collectionview scrolltoitematindexpath:indexpath atscrollposition:uicollectionviewscrollpositionleft animated:no];   // fade collectionview in [uiview animatewithduration:0.125f animations:^{     [self.collectionview setalpha:1.0f]; }];   }

this code. want image maintain full screen , collection view conforming portrait. can see cells trying adjust, collection view not resizing. suggestions/fixes?

where set new frame collectionview? either should set in willanimaterotationtointerfaceorientation: duration: or didrotatefrominterfaceorientation: or if equal size of superview, set resizing mask flexible width or height.

_collectionview.autoresizingmask = uiviewautoresizingflexiblewidth | uiviewautoresizingflexibleheight;

in viewwilllayoutsubviews setting itemsize in landscape , portrait same, intended?


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