Performing a selector on objects in a copy of an autoreleasing array

CollectionViewCoverFlowLayout.m

- (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect {    
    __autoreleasing NSArray<UICollectionViewLayoutAttributes *> * collectionViewLayoutAttributes;
    [self performSelector:@selector(changeLayoutAttributes:) withObject:[collectionViewLayoutAttributes = [[NSArray alloc] initWithArray:[super layoutAttributesForElementsInRect:rect] copyItems:TRUE] self]];
    
    return (NSArray<UICollectionViewLayoutAttributes *> *)collectionViewLayoutAttributes;
}

- (void)changeLayoutAttributes:(NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributes {
    for (UICollectionViewLayoutAttributes * attribute in layoutAttributes) {
      // change attribute code
    }
}