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# phase

A value that indicates the scroll update’s position in the scrolling life cycle.

```
var phase: BEScrollViewScrollUpdate.Phase { get }
```

## Discussion

The phases of a scroll update follow a state machine:

1. A scroll gesture begins in the [`BEScrollViewScrollUpdate.Phase.began`](/documentation/BrowserEngineKit/BEScrollViewScrollUpdate/Phase-swift.enum/began) phase when the person places their finger in the scroll view.
2. As the person interacts with the scroll view, the system generates zero or more [`BEScrollViewScrollUpdate.Phase.changed`](/documentation/BrowserEngineKit/BEScrollViewScrollUpdate/Phase-swift.enum/changed) updates.
3. The gesture enters the [`BEScrollViewScrollUpdate.Phase.ended`](/documentation/BrowserEngineKit/BEScrollViewScrollUpdate/Phase-swift.enum/ended) phase when the person lifts their finger, or the [`BEScrollViewScrollUpdate.Phase.cancelled`](/documentation/BrowserEngineKit/BEScrollViewScrollUpdate/Phase-swift.enum/cancelled) phase when another event causes the system to stop tracking the gesture.

---

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