# `BCCollectionView.zoomValueObserverKey`

*Instance Property*

## Declaration

```swift
var zoomValueObserverKey: String! { get set }
```

```objc
@property (nonatomic, copy) NSString * zoomValueObserverKey;
```

```python
zoomValueObserverKey() -> str
setZoomValueObserverKey_(zoomValueObserverKey: str)
```