# `BCCollectionViewDelegate validScalingRangeForCollectionView:`

*Instance Method*

## Declaration

```swift
optional func validScalingRange(for collectionView: BCCollectionView!) -> NSRange
```

```objc
- (NSRange) validScalingRangeForCollectionView:(BCCollectionView *) collectionView;
```

```python
validScalingRangeForCollectionView_(collectionView: BCCollectionView) -> NSRange
```