---
title: "method_copyArgumentType(_:_:)"
framework: Objective-C Runtime
role: symbol
role_heading: Function
platforms: [iOS 2.0+, iPadOS 2.0+, Mac Catalyst 13.1+, macOS 10.5+, tvOS 9.0+, visionOS 1.0+, watchOS 1.0+]
path: "objectivec/method_copyargumenttype(_:_:)"
---

# method_copyArgumentType(_:_:)

Returns a string describing a single parameter type of a method.

## Declaration

```swift
func method_copyArgumentType(_ m: Method, _ index: UInt32) -> UnsafeMutablePointer<CChar>?
```

## Parameters

- `m`: The method to inspect.
- `index`: The index of the parameter to inspect.

## Return Value

Return Value A C string describing the type of the parameter at index index, or NULL if method has no parameter index index. You must free the string with free().

## See Also

### Working with Methods

- [method_getName(_:)](objectivec/method_getname(_:).md)
- [method_getImplementation(_:)](objectivec/method_getimplementation(_:).md)
- [method_getTypeEncoding(_:)](objectivec/method_gettypeencoding(_:).md)
- [method_copyReturnType(_:)](objectivec/method_copyreturntype(_:).md)
- [method_getReturnType(_:_:_:)](objectivec/method_getreturntype(_:_:_:).md)
- [method_getNumberOfArguments(_:)](objectivec/method_getnumberofarguments(_:).md)
- [method_getArgumentType(_:_:_:_:)](objectivec/method_getargumenttype(_:_:_:_:).md)
- [method_getDescription(_:)](objectivec/method_getdescription(_:).md)
- [method_setImplementation(_:_:)](objectivec/method_setimplementation(_:_:).md)
- [method_exchangeImplementations(_:_:)](objectivec/method_exchangeimplementations(_:_:).md)