Akhilesh Sharma Akhilesh Sharma - 1 year ago 112
iOS Question

Selecting all the items in UICollectionView iOS, even the cells that are not visible

I am in the middle of creating an application where I have a button on a tool bar which selects all the items inside a collection view.

But the problem that I am facing is, when I tap on the button it selects only those items that are visible on the screen. This is due to the CELL REUSE functionality.

Is there any way that I can select all the cells, even those which are not currently visible to the user?


Answer Source

It is not possible to have all cells selected when using cell reuse.

Due to cell reuse the number of actual cells which exist at any moment is a couple more than the number of cells currently visible. i.e. 6 cells visible is about 8 cells existing.

You are able to find out how many visible cells there are with

NSArray *visiblePaths = [self.collectionView indexPathsForVisibleItems];

The solution is to have the selected value stored within the UICollectionView datasource and use that value for when you customise a cell inside cellForItemAtIndexPath

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