---
title: startProgress
framework: quartzcore
role: symbol
role_heading: Instance Property
path: quartzcore/catransition/startprogress
---

# startProgress

Indicates the start point of the receiver as a fraction of the entire transition.

## Declaration

```swift
var startProgress: Float { get set }
```

## Discussion

Discussion Legal values are numbers between 0.0 and 1.0. For example, to start the transition half way through its progress set startProgress to 0.5. The default value is 0.

## See Also

### Related Documentation

- [Core Animation Programming Guide](apple-archive/documentation/Cocoa/Conceptual/CoreAnimation_guide/Introduction.md)

### Transition start and end point

- [endProgress](quartzcore/catransition/endprogress.md)