---
title: topField
framework: corevideo
role: symbol
role_heading: Type Property
path: corevideo/cvtimestampflags/topfield
---

# topField

The timestamp represents the top lines of an interlaced image.

## Declaration

```swift
static var topField: CVTimeStampFlags { get }
```

## See Also

### Constants

- [bottomField](corevideo/cvtimestampflags/bottomfield.md)
- [hostTimeValid](corevideo/cvtimestampflags/hosttimevalid.md)
- [isInterlaced](corevideo/cvtimestampflags/isinterlaced.md)
- [rateScalarValid](corevideo/cvtimestampflags/ratescalarvalid.md)
- [smpteTimeValid](corevideo/cvtimestampflags/smptetimevalid.md)
- [videoHostTimeValid](corevideo/cvtimestampflags/videohosttimevalid.md)
- [videoRefreshPeriodValid](corevideo/cvtimestampflags/videorefreshperiodvalid.md)
- [videoTimeValid](corevideo/cvtimestampflags/videotimevalid.md)