iOS UICollectionView 添加 headerView 分组后滚动到指定的section

Posted 2021-07-06 夏天然后

方案 1

UICollectionViewLayoutAttributes *attributes = [self.collectionView layoutAttributesForItemAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:DJSection]];
                CGRect rect = attributes.frame;
                [self.collectionView setContentOffset:CGPointMake(self.collectionView.frame.origin.x, rect.origin.y - DJ_ADAPT_750(120)) animated:NO];

方案 2

[_collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:0 inSection:index] atScrollPosition:UICollectionViewScrollPositionTop animated:YES];

方案有个缺点, headerView 会遮挡当前 cell, 所以推荐方案 1