# `GSLayer.content`

*Instance Property*

A KVO dependency key for changes to any content of the layer.

## Declaration

```swift
unowned(unsafe) var content: AnyObject? { get }
```

```objc
@property (nonatomic, unsafe_unretained, readonly) id content;
```

```python
content() -> object
```

## Discussion

Observe this property to receive combined content changes. Its value is always `nil`.

## See Also

### Update State

- [`GSLayer.lastUpdate`](/Core/GlyphsCore/GSLayer/lastUpdate) — The time of the most recent geometry invalidation.
- [`GSLayer.lastOperation`](/Core/GlyphsCore/GSLayer/lastOperation) — The most recent update affecting the layer or its referenced content.
- [`GSLayer lastOperation:`](/Core/GlyphsCore/GSLayer/lastOperation:) — The most recent update affecting the layer or its referenced content, while avoiding component cycles.
- [`GSLayer.upToDate`](/Core/GlyphsCore/GSLayer/upToDate) — Whether derived representations are newer than changes that affect the layer.
- [`GSLayer.isUpdatingMetrics`](/Core/GlyphsCore/GSLayer/isUpdatingMetrics) — Whether the layer is currently updating its side bearings.