更改CollectionView单元的垂直间距

Question

Am using UICollectionView and changing the size of the item in the delegate method of collection view like this

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.

    lastIndex = 0;
    layoutDiff = 4;
}


- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    if(indexPath.row == (lastIndex + layoutDiff) - 1){
        layoutDiff = (layoutDiff == 4)?5:4;
        lastIndex = indexPath.row + 1;
        return CGSizeMake(213.2, 213.2);
    }

    return CGSizeMake(106.6, 106.6);
}

and here is my current screen.

and all the below cells to be follow this behaviour, means the pattern i want is like one collection view item to big depending on my logic where i want to make it big but i don't want this space. I think if the space will not b there then all things will be right. Can anyone help with this?

Answer 1

FlowLayout can't help with this.

You hava to implement your subclass of UICollectionLayout.

Here are some articles that take about custom Collection View Layout.

Custom Collection View Layouts.

https://www.objc.io/issues/3-views/collection-view-layouts/

Knowing When to Subclass the Flow Layout https://developer.apple.com/library/ios/documentation/WindowsViews/Conceptual/CollectionViewPGforIOS/UsingtheFlowLayout/UsingtheFlowLayout.html#//apple_ref/doc/uid/TP40012334-CH3-SW4