How to get the rect of a UICollectionViewCell?
IosUitableviewIos6UicollectionviewIos Problem Overview
UITableView
has the method rectForRowAtIndexPath:
, but this does not exist in UICollectionView. I'm looking for a nice clean way to grab a cell's bounding rectangle, perhaps one that I could add as a category on UICollectionView
.
Ios Solutions
Solution 1 - Ios
The best way I've found to do this is the following:
Objective-C
UICollectionViewLayoutAttributes *attributes = [self.collectionView layoutAttributesForItemAtIndexPath:indexPath];
Swift
let attributes = collectionView.layoutAttributesForItem(at: indexPath)
Then you can access the location through either attributes.frame
or attributes.center
Solution 2 - Ios
Only two lines of code is required to get 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)
Solution 3 - Ios
in swift 3
let theAttributes:UICollectionViewLayoutAttributes! = collectionView.layoutAttributesForItem(at: indexPath)
let cellFrameInSuperview:CGRect! = collectionView.convert(theAttributes.frame, to: collectionView.superview)
Solution 4 - Ios
in swift you can just do:
//for any cell in collectionView
let rect = self.collectionViewLayout.layoutAttributesForItemAtIndexPath(clIndexPath).frame
//if you only need for visible cells
let rect = cellForItemAtIndexPath(indexPath)?.frame
Solution 5 - Ios
How about
-(CGRect)rectForCellatIndexPath:(NSIndexPath *)indexPath {
UICollectionViewCell *cell = [self cellForItemAtIndexPath:indexPath];
if (!cell) {
return CGRectZero;
}
return cell.frame;
}
as a category on 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