UICollectionView Question About reuse cell show the same image

UICollectionView About reuse cell show the same image/ Did not clear up the image for reuse cell.

Relative Code:

-(void)viewDidLoad{
[super viewDidLoad];
[_imageCollectionView registerClass:[CVContactPickerImageCollectionCell class] forCellWithReuseIdentifier:@"selectingCollectionViewCell"];
}

#pragma mark - UICollectionViewDataSource
-(UICollectionViewCell *)collectionView:collectionView cellForItemAtIndexPath: indexPath {
CVContactPickerImageCollectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"selectingCollectionViewCell" forIndexPath:indexPath];
[cell.collectionImageView unsetImage];
if (!cell)
cell = [CVContactPickerImageCollectionCell alloc] init];
...
return cell;
}

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