apploft / aplexpandablecollectionview Goto Github PK

The expandable collection view uses first item in each section as the "header" and the rest as "items", and it'd be very useful if we could customize the separators for inter-section as well as inter-item (or is there an easy way to do that?)

PS: The response to the previous issue was super fast 👍

I got the same issue of #3 . why is it closed?

I have around 100 items in the collectionview with picture and text. When opening a section, if there are 10,20 items in the expanded section it's fine. When it contains 100 it takes around 1.5 seconds which is laggy for the user. Any solutions? (Maybe because each time i expand, the whole collectionview loads?) Thank you!

I was trying to implement adding of new sections when pressing a button. Instead of hard coded value for the number of sections I use an array of items and add new item into that array on button press; after that I call the [collectionView reloadData]; It seems simple enough but unfortunately the app crashes and I cannot manage to reload the data to show the new section. Can you please give me some advice on how could this be achieved in the current implementation. It would be very, very helpful.

Since APLSectionTopToBottomFlowLayout is a subclass of UICollectionViewFlowLayout, it naturally makes sense to support UICollectionViewDelegateFlowLayout so that individual item sizes & line spacings can be customized - for example, currently there is no way to make section height larger than item height.

Pod installation complete! There are 3 dependencies from the Podfile and 3 total pods installed.

[!] The ARViewerDemo [Debug] target overrides the LIBRARY_SEARCH_PATHS build setting defined in Pods/Target Support Files/Pods-ARViewerDemo/Pods-ARViewerDemo.debug.xcconfig'. This can lead to problems with the CocoaPods installation - Use the $(inherited)` flag, or
- Remove the build settings from the target.

[!] The ARViewerDemo [Release] target overrides the LIBRARY_SEARCH_PATHS build setting defined in Pods/Target Support Files/Pods-ARViewerDemo/Pods-ARViewerDemo.release.xcconfig'. This can lead to problems with the CocoaPods installation - Use the $(inherited)` flag, or
- Remove the build settings from the target.

Hello,

I have extended the Demo to display a + or a - label in the section cells. I use cellForItemAtIndexPath to hide the label on item cells:

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    APLCollectionViewCell* cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"APLCollectionViewCell" forIndexPath:indexPath];

    if (indexPath.item == 0) {
        cell.label.text = [NSString stringWithFormat:@"Section %li", (long)indexPath.section + 1];
        cell.backgroundColor = [UIColor colorWithRed:58./255. green:165./255. blue:192./255. alpha:1.];
        cell.indentView.hidden = YES;
        cell.label_OnOff.text = @"+";
    } else {
        cell.label.text = [NSString stringWithFormat:@"Item %li", (long)indexPath.row];
        cell.backgroundColor = [UIColor colorWithRed:58./255. green:165./255. blue:192./255. alpha:.5];
        cell.indentView.hidden = NO;
        [cell.label_OnOff setHidden:YES];
    }

    return cell;
}

To switch between + and - I implemented the delegate methods:

- (void)collectionView:(UICollectionView *)collectionView didCollapseItemAtIndexPath:(NSIndexPath *)indexPath
{
    APLCollectionViewCell *cell = (APLCollectionViewCell*)[collectionView cellForItemAtIndexPath:indexPath];
    cell.label_OnOff.text = @"+";
}
- (void)collectionView:(UICollectionView *)collectionView didExpandItemAtIndexPath:(NSIndexPath *)indexPath
{
    APLCollectionViewCell *cell = (APLCollectionViewCell*)[collectionView cellForItemAtIndexPath:indexPath];
    cell.label_OnOff.text = @"-";
}

As you can see in the screenshot - the label is hidden on some section cells and some item cells. I don't know why this happens - indexPath.item == 0 should check if a specific cell is a section or an item?
It seems that this issue is only present, if cells are not visible. After scrolling down and revealing new cells in the collection view - the label is not visible.

I am using a single collectionview to load three collection of data based on three button clicks.First collection has say 2 items so the datasource gets updated, now if any of the remaining two collections has data more than 2 items, app crashes.

[__NSArrayM objectAtIndex:]: index 2 beyond bounds [0 .. 1]

Hello! Thanks for sharing this! We should add a simple init method to support initing from code:

• (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout {
  self = [super initWithFrame:frame collectionViewLayout:layout];
  if (self) {
  [self commonInit];
  }
  return self;
  }

in objective-c

• (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
  {
  return CGSizeMake(320, 120);
  }

not works

in swift:

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {

    return CGSize(width: self.view.frame.size.width, height: 120)
}

not works
:(

only i can change size item with this code:

let layout:APLExpandableSectionFlowLayout = self.collectionView.collectionViewLayout as! APLExpandableSectionFlowLayout
layout.itemSize = CGSizeMake(self.view.frame.size.width, 120);
layout.minimumLineSpacing = 4
layout.scrollDirection = .Vertical
layout.sectionInset = UIEdgeInsetsMake(8, 8, 0, 8);

but i need to do by NSIndexPath

Hi, Expert,

Is it doable as a new feature: Horizontal expandableCollectionView

BR

Steven

It would be quite handy to have the ability to expand and collapse sections programatically.

Nvm, just solved this issue. It was due to an error that I made. Thanks anyway!

I am using a header view for my collection view cells and when I try to implement this my first cell is acting like the button to expand / contract the Collection View cells in that section. Could you please help me how to achieve this using the Collection view header ?

I want to reset all expanded sections but there is no way.

I have been browsing through the code base, and have a question: I don't really understand why you need the following methods to manipulate the data source:

- (void)addExpandedSection:(BOOL)isExpanded;
- (void)insertExpandedSection:(BOOL)isExpanded atIndex:(NSUInteger)index;

In the end, I could just change my original dataSource and then call reloadData to have the same effect, or am I missing something (ignoring that it seems to be the only way to expand #16 atm)? Generally, I don't understand why the collection takes over data source responsibilities. In my eyes it just encourages inconsistencies between the "two" different data sources.

And I wanted to thank you for your work! I wanted to build exactly the same view, but then discovered your solution.

Hi,

I'm trying to change size of individual collection view cell's using "collectionViewLayout:sizeForItemAtIndexPath:" method but it always override it with layout.itemSize value.

itemSize: 375,40
sizeForIndexPath method return size of item which is (50,50). When i check the cell size it's (375,40) again.

Help please..

How can we collapse previous selection when a new item a selected.
I want only one item to be in expanded mode at a time