How to rearrange collection view cell when device orientation changes

Question

enter image description here

Collection view looks fine when in portrait mode. But when it landscape mode the cells do not rearrange .. they remain in the same place. enter image description here

I have added autolayout so that the collection view stretches to fill the screen and the collection view has a constant height constraint.

My view hierarchy is like this

View ->ScrollView->ContentView |--> Problematic collection view (one above notifications label) | |-> Tableview (one after after the notifications label) | |->Collection view (black space on top)

The code for the collection view is

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;}
-(NSInteger)collectionView:(UICollectionView *)collectionView
numberOfItemsInSection:(NSInteger)section
{
 return 14;
}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
             cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
if (collectionView==self.offerCollectionView) {
    sliderCollectionInHomeScreen *myCell = [collectionView dequeueReusableCellWithReuseIdentifier:@"reuseIdForSlider"
                                                                                     forIndexPath:indexPath];
    myCell.labelForShopName.text = [[self.arrayForOfferSlider objectAtIndex:indexPath.row] objectForKey:@"shop_name"];
    myCell.labelForOfferName.text = [[self.arrayForOfferSlider objectAtIndex:indexPath.row] objectForKey:@"offer_title"];
    myCell.offerImage.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[[self.arrayForOfferSlider objectAtIndex:indexPath.row] objectForKey:@"img_url"]]]];

    ;


    return myCell;
}

Share some code, does it gives any error or warning? – Rashad Oct 16 '14 at 06:53 — Rashad, Oct 16 '14 at 06:53
It does not show any errors. – Martin Jacob Oct 16 '14 at 07:00 — Martin Jacob, Oct 16 '14 at 07:00
Share some code for collection view. – Rashad Oct 16 '14 at 07:00 — Rashad, Oct 16 '14 at 07:00

score 0 · Answer 1 · answered Oct 17 '14 at 06:32

I don't know if this is correct . But this has worked for me for the time being

-(void) didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrient{

//[self.categoryCollectionView reloadData];
UICollectionViewFlowLayout * lay =[[UICollectionViewFlowLayout alloc] init];
if (UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation)) {
    [lay setScrollDirection:UICollectionViewScrollDirectionVertical];
}
else{

    [lay setScrollDirection:UICollectionViewScrollDirectionHorizontal];
}


[self.CollectionView setCollectionViewLayout:lay];


}

How to rearrange collection view cell when device orientation changes

1 Answers1