---
title: start
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avvideocompositionlayerinstruction/opacityramp/start
---

# start

## Declaration

```swift
var start: Float
```

## See Also

### Inspecting the opacity ramp

- [end](avfoundation/avvideocompositionlayerinstruction/opacityramp/end.md)
- [timeRange](avfoundation/avvideocompositionlayerinstruction/opacityramp/timerange.md)