How to get UICollectionViewCell address?

Question

UITableView has a rectForRowAtIndexPath: method, but this does not exist in UICollectionView. I'm looking for a nice clean way to grab a rectangle with a cell, maybe one that I could add as a category on a UICollectionView .

Answer 1

The best way I found for this is as follows:

Objective-c

 UICollectionViewLayoutAttributes *attributes = [self.collectionView layoutAttributesForItemAtIndexPath:indexPath]; 

swift

 let attributes = collectionView.layoutAttributesForItem(at: indexPath) 

Then you can access the location via attributes.frame or attributes.center

Answer 2

It takes only two lines of code to get the perfect frame:

Objective-c

 UICollectionViewLayoutAttributes * theAttributes = [collectionView layoutAttributesForItemAtIndexPath:indexPath]; CGRect cellFrameInSuperview = [collectionView convertRect:theAttributes.frame toView:[collectionView superview]]; 

Swift 4.2

 let theAttributes = collectionView.layoutAttributesForItem(at: indexPath) let cellFrameInSuperview = collectionView.convert(theAttributes.frame, to: collectionView.superview) 

Answer 3

in fast 3

  let theAttributes:UICollectionViewLayoutAttributes! = collectionView.layoutAttributesForItem(at: indexPath) let cellFrameInSuperview:CGRect! = collectionView.convert(theAttributes.frame, to: collectionView.superview) 

Answer 4

in fast mode:

 //for any cell in collectionView let rect = self.collectionViewLayout.layoutAttributesForItemAtIndexPath(clIndexPath).frame //if you only need for visible cells let rect = cellForItemAtIndexPath(indexPath)?.frame 

Answer 5

What about

 -(CGRect)rectForCellatIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell *cell = [self cellForItemAtIndexPath:indexPath]; if (!cell) { return CGRectZero; } return cell.frame; } 

How is the category on a UICollectionView ?

 #import <UIKit/UIKit.h> @interface UICollectionView (CellFrame) -(CGRect)rectForCellatIndexPath:(NSIndexPath *)indexPath; @end #import "UICollectionView+CellFrame.h" @implementation UICollectionView (CellFrame) -(CGRect)rectForCellatIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell *cell = [self cellForItemAtIndexPath:indexPath]; if (!cell) { return CGRectZero; } return cell.frame; } @end