# `GSFontViewSidebarController.treeController`

*Instance Property*

## Declaration

```swift
@IBOutlet unowned(unsafe) var treeController: NSTreeController! { get set }
```

```objc
@property (nonatomic, unsafe_unretained) NSTreeController * treeController;
```

```python
treeController() -> NSTreeController
setTreeController_(treeController: NSTreeController)
```