---
title: aggregator
framework: CareKit
role: symbol
role_heading: Instance Property
platforms: [iOS 13.0+, Mac Catalyst 13.0+, watchOS 7.0+]
path: carekit/ockdataseriesconfiguration/aggregator
---

# aggregator

A closure that accepts a day’s worth of events as an argument, and returns a y-axis value for that day.

## Declaration

```swift
var aggregator: OCKEventAggregator
```

## See Also

### Configuring Charts

- [taskID](carekit/ockdataseriesconfiguration/taskid.md)
- [legendTitle](carekit/ockdataseriesconfiguration/legendtitle.md)
- [markerSize](carekit/ockdataseriesconfiguration/markersize.md)