---
title: migrationProgress
framework: coredata
role: symbol
role_heading: Instance Property
path: coredata/nsmigrationmanager/migrationprogress
---

# migrationProgress

A number between 0 and 1 that indicates the proportion of completeness of the migration.

## Declaration

```swift
var migrationProgress: Float { get }
```

## Discussion

Discussion If a migration is not taking place, this property is 1. You can observe this value using key-value observing.

## See Also

### Monitoring a Migration’s Progress

- [currentEntityMapping](coredata/nsmigrationmanager/currententitymapping.md)