How to get the rect of a UICollectionViewCell?

问题:

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.

回答1:

The best way I've found to do this is the following:

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

Then you can access the location through either attributes.frame or attributes.center

回答2:

Only two lines of code is required to get perfect frame :

UICollectionViewLayoutAttributes * theAttributes = [collectionView layoutAttributesForItemAtIndexPath:indexPath];

CGRect cellFrameInSuperview = [collectionView convertRect:theAttributes.frame toView:[collectionView superview]];

回答3:

in swift 3

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

回答4:

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

回答5:

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