---
title: ILMessageFilterExtension
framework: SMS and Call Reporting
role: symbol
role_heading: Class
platforms: [iOS 11.0+, iPadOS 11.0+, Mac Catalyst 13.0+, visionOS 1.0+]
path: identitylookup/ilmessagefilterextension
---

# ILMessageFilterExtension

The abstract base class for the principal class of a Message Filter app extension.

## Declaration

```swift
class ILMessageFilterExtension
```

## Mentioned in

Creating a Message Filter App Extension

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### App Extension

- [ILMessageFilterExtensionContext](identitylookup/ilmessagefilterextensioncontext.md)