---
title: PreviewTimelineBuilder
framework: widgetkit
role: symbol
role_heading: Structure
path: widgetkit/previewtimelinebuilder
---

# PreviewTimelineBuilder

## Declaration

```swift
@resultBuilder struct PreviewTimelineBuilder
```

## Topics

### Previewing timelines

- [buildArray(_:)](widgetkit/previewtimelinebuilder/buildarray(_:).md)
- [buildExpression(_:)](widgetkit/previewtimelinebuilder/buildexpression(_:).md)
- [buildPartialBlock(accumulated:next:)](widgetkit/previewtimelinebuilder/buildpartialblock(accumulated:next:).md)
- [buildPartialBlock(first:)](widgetkit/previewtimelinebuilder/buildpartialblock(first:).md)

## See Also

### Generated structures

- [PreviewActivityBuilder](widgetkit/previewactivitybuilder.md)
- [PreviewRelevanceEntryBuilder](widgetkit/previewrelevanceentrybuilder.md)