Swift - UICollectionView+DZNEmptyDataSet出现的位置偏移问题的解决办法

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    if collectionView?.emptyDataSetSource == nil {
        collectionView?.emptyDataSetSource = self
        collectionView?.emptyDataSetDelegate = self
        collectionView?.reloadEmptyDataSet()
    }
}