Adding new items to the collection rearranges old cells

[limenutt]

Hi there. In my Photozeen iOS app I'm loading more images to the photo feed as user scrolls it down. Every time I have new portion of images from server I add them to the collection by calling insertItemsAtIndexPaths. I see that items are getting rearranged every time. What can I do to make previously loaded items stay still except adding new section for every new portion of images?

[njdehoog]

Are you adding every new batch of items to a different section, or are all the images in the same section. The layout is calculated per section, so adding a new section should allow the previous section to remain unchanged. Although I'm not sure if it would redo the calculation for the previous sections as well.

[limenutt]

Yes, currently I'm using only one section and was looking for workaround without adding new section for every new batch. But looks like it is the only solution, am I right?

[njdehoog]

That's right. The implementation of the layout algorithm is such that it tries to determine the best possible layout based on every image in a section, so every time you add a new image it is likely to affect the layout.