---
title: "setTransformRamp(fromStart:toEnd:timeRange:)"
framework: avfoundation
role: symbol
role_heading: Instance Method
path: "avfoundation/avmutablevideocompositionlayerinstruction/settransformramp(fromstart:toend:timerange:)"
---

# setTransformRamp(fromStart:toEnd:timeRange:)

Sets a transform ramp to apply during a given time range.

## Declaration

```swift
func setTransformRamp(fromStart startTransform: CGAffineTransform, toEnd endTransform: CGAffineTransform, timeRange: CMTimeRange)
```

## Parameters

- `startTransform`: The transform to be applied at the starting time of timeRange.
- `endTransform`: The transform to be applied at the end time of timeRange.
- `timeRange`: The time range over which the value of the transform is interpolated between startTransform and endTransform.

## Discussion

Discussion During a transform ramp, the affine transform is interpolated between the values set at the ramp’s start time and end time. Before the first specified time for which a transform is set, the affine transform is held constant at the value of CGAffineTransformIdentity; after the last time for which a transform is set, the affine transform is held constant at that last value.

## See Also

### Managing properties

- [setOpacity(_:at:)](avfoundation/avmutablevideocompositionlayerinstruction/setopacity(_:at:).md)
- [setOpacityRamp(fromStartOpacity:toEndOpacity:timeRange:)](avfoundation/avmutablevideocompositionlayerinstruction/setopacityramp(fromstartopacity:toendopacity:timerange:).md)
- [setTransform(_:at:)](avfoundation/avmutablevideocompositionlayerinstruction/settransform(_:at:).md)