UICollectionView - Horizontal scroll horizontal layout

Question

I have a UIScrollView that lays out a grid of icons   If you were to imagine the layout for the iOS Springboard  you d be pretty close to correct   It has a horizontal  paged scroll  just like Springboard    However  it appears that the layout is not quite right   It appears as though it is laying out the items from top to bottom   As a result  my last column only has 2 rows in it  due to the number of items to be displayed   I d rather have my last row on the last page have 2 items  like you would see in the Springboard   How can this be accomplished with UICollectionView and its related classes   Do I have to write a custom UICollectionViewFlowLayout

User · Answer

for xcode 8 i did this and it worked

User · Answer

Have you tried setting the scroll direction of your UICollectionViewFlowLayout to horizontal    yourFlowLayout setScrollDirection UICollectionViewScrollDirectionHorizontal     And if you want it to page like springboard does  you ll need to enable paging on your collection view like so    yourCollectionView setPagingEnabled YES

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We can do same Springboard behavior using UICollectionView and for that we need to write code for custom layout   I have achieved it with my custom layout class implementation with  SMCollectionViewFillLayout    Code repository   https   github com smindia1988 SMCollectionViewFillLayout  Output as below   1 png    2 Code H-Scroll V-Fill png    3 Output H-Scroll V-Fill png   4 Code H-Scroll H-Fill png   5 Output H-Scroll H-Fill png

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You need to reduce the height of UICollectionView to its cell   item height and select  Horizontal  from the  Scroll Direction  as seen in the screenshot below  Then it will scroll horizontally depending on the numberOfItems you have returned in its datasource implementation

User · Answer

You can write a custom UICollectionView layout to achieve this  here is demo image of my implementation     Here s code repository  KSTCollectionViewPageHorizontalLayout   iPhoneDev  this maybe help you too

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If you are defining UICollectionViewFlowLayout in code  it will override Interface Builder configs  Hence you need to re-define the scrollDirection again   let layout   UICollectionViewFlowLayout       layout scrollDirection    Horizontal self awesomeCollectionView collectionViewLayout   layout

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This code works well in Swift 3 1 and Xcode 8 3 2   override func viewDidLayoutSubviews             super viewDidLayoutSubviews            let layout   UICollectionViewFlowLayout           layout scrollDirection    horizontal         self collectionView collectionViewLayout   layout         self collectionView  contentInset   UIEdgeInsets top  -10  left  0  bottom 0  right  0           if let layout   self collectionView collectionViewLayout as  UICollectionViewFlowLayout               layout minimumInteritemSpacing   0             layout minimumLineSpacing   0             layout itemSize   CGSize width  self view frame size width-40  height  self collectionView frame size height-10              layout invalidateLayout

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I am working on Xcode 6 2 and for horizontal scrolling I have changed scroll direction in attribute inspector   click on collectionView- attribute inspector- scroll Direction- change to horizontal   I hope it helps someone

User · Answer

1st approach What about using UIPageViewController with an array of UICollectionViewControllers  You d have to fetch proper number of items in each UICollectionViewController  but it shouldn t be hard  You d get exactly the same look as the Springboard has  2nd approach I ve thought about this and in my opinion you have to set  self collectionView pagingEnabled   YES   and create your own collection view layout by subclassing UICollectionViewLayout  From the custom layout object you can access self collectionView  so you ll know what is the size of the collection view s frame  numberOfSections and numberOfItemsInSection   With that information you can calculate cells  frames  in prepareLayout  and collectionViewContentSize  Here re some articles about creating custom layouts   https   developer apple com library content documentation WindowsViews Conceptual CollectionViewPGforIOS CreatingCustomLayouts CreatingCustomLayouts html http   www objc io issue-3 collection-view-layouts html  3rd approach You can do this  or an approximation of it  without creating the custom layout  Add UIScrollView in the blank view  set paging enabled in it  In the scroll view add the a collection view  Then add to it a width constraint  check in code how many items you have and set its constant to the correct value  e g   self view frame size width   numOfScreens   Here s how it looks  numbers on cells show the indexPath row   https   www dropbox com s ss4jdbvr511azxz collection view mov If you re not satisfied with the way cells are ordered  then I m afraid you d have to go with 1  or 2

User · Answer

Just for fun  another approach would be to just leave the paging and horizontal scrolling set  add a method that changes the order of the array items to convert from  top to bottom  left to right  to visually  left to right  top to bottom  and fill the in-between cells with empty hidden cells to make the spacing right  In case of 7 items in a grid of 9  this would go like this    1  4  7   2  5      3  6       should become   1  2  3   4  5  6   7          so 1 1  2 4  3 7 etc  and 6 empty  You can reorder them by calculating the total number of rows and columns  then calculate the row and column number for each cell  change the row for the column and vice versa and then you have the new indexes  When the cell doesn t have a value corresponding to the image you can return an empty cell and set cell hidden   YES  to it   It works quite well in a soundboard app I built  so if anyone would like working code I ll add it  Only little code is required to make this trick work  it sounds harder than it is   Update  I doubt this is the best solution  but by request here s working code   -  void viewDidLoad          Fill an  NSArray  with items in normal order     items    NSMutableArray arrayWithObjects                NSDictionary dictionaryWithObjectsAndKeys   Some label 1     label     Some value 1     value   nil                 NSDictionary dictionaryWithObjectsAndKeys   Some label 2     label     Some value 2     value   nil                 NSDictionary dictionaryWithObjectsAndKeys   Some label 3     label     Some value 3     value   nil                 NSDictionary dictionaryWithObjectsAndKeys   Some label 4     label     Some value 4     value   nil                 NSDictionary dictionaryWithObjectsAndKeys   Some label 5     label     Some value 5     value   nil                 nil                          Calculate number of rows and columns based on width and height of the  UICollectionView  and individual cells  you might have to add margins to the equation based on your setup       CGFloat w   myCollectionView frame size width      CGFloat h   myCollectionView frame size height      rows   floor h   cellHeight       columns   floor w   cellWidth         Calculate number of sections -  NSInteger numberOfSectionsInCollectionView  UICollectionView   collectionView       return ceil  float items count    float  rows   columns          Every section has to have every cell filled  as we need to add empty cells as well to correct the spacing -  NSInteger collectionView  UICollectionView   collectionView numberOfItemsInSection  NSInteger section       return rows columns        And now the most important one -  UICollectionViewCell   collectionView  UICollectionView   collectionView cellForItemAtIndexPath  NSIndexPath   indexPath       UICollectionViewCell  cell    collectionView dequeueReusableCellWithReuseIdentifier  myIdentifier  forIndexPath indexPath           Convert rows and columns     int row   indexPath row   rows      int col   floor indexPath row   rows          Calculate the new index in the  NSArray      int newIndex     int indexPath section   rows   columns    col   row   columns          If the newIndex is within the range of the items array we show the cell  if not we hide it     if newIndex  lt  items count            NSDictionary  item    items objectAtIndex newIndex           cell label text    item objectForKey   label            cell hidden   NO        else           cell hidden   YES             return cell      If you d like to use the didSelectItemAtIndexPath method you have to use the same conversion that is used in cellForItemAtIndexPath to get the corresponding item  If you have cell margins you need to add them to the rows and columns calculation  as those have to be correct in order for this to work

User · Answer

From  Erik Hunter  I post full code for make horizontal UICollectionView  UICollectionViewFlowLayout  collectionViewFlowLayout     UICollectionViewFlowLayout alloc  init    collectionViewFlowLayout setScrollDirection UICollectionViewScrollDirectionHorizontal   self myCollectionView collectionViewLayout   collectionViewFlowLayout    In Swift   let layout   UICollectionViewFlowLayout   layout scrollDirection    Horizontal self myCollectionView collectionViewLayout   layout   In Swift 3 0  let layout   UICollectionViewFlowLayout   layout scrollDirection    horizontal self myCollectionView collectionViewLayout   layout   Hope this help

User · Answer

If you need to set the UICollectionView scrolling Direction Horizental and you need to set cell width and height static  Please set the collectionview estimate size Automatic into None   View The ScreenShot

[ios] UICollectionView - Horizontal scroll, horizontal layout?

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