---
title: Objective-C Runtime Utilities
framework: foundation
role: collectionGroup
role_heading: API Collection
path: foundation/objective-c-runtime-utilities
---

# Objective-C Runtime Utilities

Interact with the Objective-C runtime.

## Topics

### Type Lookup

- [NSClassFromString(_:)](foundation/nsclassfromstring(_:).md)
- [NSStringFromClass(_:)](foundation/nsstringfromclass(_:).md)
- [NSSelectorFromString(_:)](foundation/nsselectorfromstring(_:).md)
- [NSStringFromSelector(_:)](foundation/nsstringfromselector(_:).md)
- [NSStringFromProtocol(_:)](foundation/nsstringfromprotocol(_:).md)
- [NSProtocolFromString(_:)](foundation/nsprotocolfromstring(_:).md)

### Serialization

- [NSGetSizeAndAlignment(_:_:_:)](foundation/nsgetsizeandalignment(_:_:_:).md)